Endometriosis

According to the Centers for Disease Control and Preventions, in 2019 2.1% of all infants born in the United States were conceived by assisted reproductive technology (ART). Now 45 years old, ART, namely in vitro fertilization (IVF), is offered in nearly 500 clinics in the United States, contributing to over 300,000 treatment cycles per year.

A tubal factor is responsible for 30% of female infertility and may involve proximal and/or distal tubal occlusion, irrespective of pelvic adhesions.¹ Before the advent of IVF, the sole approach to the treatment of a tubal factor had been surgery. Given its success and minimal invasiveness, IVF is increasingly being offered to circumvent a tubal factor for infertility. This month we examine the utility of surgical treatment of tubal factor infertility. The options for fertility with a history of bilateral tubal ligation was covered in a prior Reproductive Rounds column.

Trolice_Mark _P_FLA_2022_web.jpg

Tubal disease and pelvic adhesions prevent the normal transport of the oocyte and sperm through the fallopian tube. The primary etiology of tubal factor infertility is pelvic inflammatory disease, mainly caused by chlamydia or gonorrhea. Other conditions that may interfere with tubal transport include severe endometriosis, adhesions from previous surgery, or nontubal infection (for example, appendicitis, inflammatory bowel disease), pelvic tuberculosis, and salpingitis isthmica nodosa (that is, diverticulosis of the fallopian tube).
 

Proximal tubal occlusion

During a hysterosalpingogram (HSG), transient uterine cornual spasm can result if a woman experiences significant uterine cramping, thereby resulting in a false-positive diagnosis of proximal tubal occlusion. When a repeat HSG is gently performed with slow instillation of contrast, uterine cramping is less likely, and the tubal patency rate is 60%. PTO may also result from plugs of mucus and amorphous debris, but this is not true occlusion.² In cases with unilateral PTO, controlled ovarian hyperstimulation with intrauterine insemination has resulted in pregnancy rates similar to those in patients with unexplained infertility.³

Reconstructive surgery for bilateral PTO has limited effectiveness and the risk of subsequent ectopic pregnancy is as high as 20%.⁴ A more successful option is fluoroscopic tubal catheterization (FTC), an outpatient procedure performed in a radiology or infertility center. FTC uses a coaxial catheter system where the outer catheter is guided through the tubal ostium and an inner catheter is atraumatically advanced to overcome the blockage. This procedure is 85% successful for tubal patency with 50% of patients conceiving in the first 12 months; one-third of time the tubes reocclude. After the reestablishment of patency with FTC, the chance of achieving a live birth is 22% and the risk of ectopic pregnancy is 4%.⁵

Treatment of distal tubal occlusion – the hydrosalpinx

Surgery for treating tubal factor infertility is most successful in women with distal tubal obstruction (DTO), often caused by a hydrosalpinx. Fimbrioplasty is the lysis of fimbrial adhesions or dilatation of fimbrial strictures; the tube is patent, but there are adhesive bands that surround the terminal end with preserved tubal rugae. Gentle introduction of an alligator laparoscopic forceps into the tubal ostium followed by opening and withdrawal of the forceps helps to stretch the tube and release minor degrees of fimbrial agglutination.⁶

A hydrosalpinx is diagnosed by DTO with dilation and intraluminal fluid accumulation along with the reduction/loss of endothelial cilia. Left untreated, a hydrosalpinx can lead to a 50% reduction in IVF pregnancy rates.⁷ Tube-sparing treatment involves neosalpingostomy to create a new tubal opening. A nonsurgical approach, ultrasound-guided aspiration of hydrosalpinges, has not been shown to significantly increase the rate of clinical pregnancy. Efficacy for improving fertility is generally poor, but depends upon tubal wall thickness, ampullary dilation, presence of mucosal folds, percentage of ciliated cells in the fimbrial end, and peritubal adhesions.⁸

Evidence supports that laparoscopic salpingectomy in women with hydrosalpinges improves the outcomes of IVF treatment, compared with no surgical intervention.⁹ The improvement in pregnancy and live birth rates likely stems from the elimination of the retrograde flow of embryotoxic fluid that disrupts implantation. Endometrial receptivity markers (endometrial cell adhesion molecules, integrins, and HOXA10) have been shown to be reduced in the presence of hydrosalpinx.¹⁰ A small, randomized trial demonstrated that bipolar diathermy prior to IVF improved pregnancy outcomes.¹¹ PTO was not more effective than salpingectomy. Conceptions, without IVF, have been reported following salpingectomy for unilateral hydrosalpinx.¹²

In a series including 434 patients with DTO who underwent laparoscopic fimbrioplasty (enlargement of the ostium) or neosalpingostomy (creation of a new ostium) by a single surgeon, 5-year actuarial delivery rates decreased as the severity of tubal occlusion increased; the ectopic rate was stable at approximately 15%.¹³ A prospective study reported that the relative increase in the pregnancy rate after salpingectomy was greatest in women with a large hydrosalpinx visible on ultrasound.¹⁴

Because of the possible risks of decreased ovarian reserve secondary to interruption of ovarian blood supply, salpingectomy should be done with minimal thermal injury and very close to the fallopian tube.

162178_graphic_web.png

Summary

Surgery may be considered for young women with mild distal tubal disease as one surgical procedure can lead to several pregnancies whereas IVF must be performed each time pregnancy is desired. IVF is more likely than surgery to be successful in women with bilateral hydrosalpinx, in those with pelvic adhesions, in older reproductive aged women, and for both proximal and distal tubal occlusion.¹⁵ An online prediction calculator from the Society for Assisted Reproductive Technology (SART) can be helpful in counseling patients on personalized expectations for IVF pregnancy outcomes.

Dr. Trolice is director of The IVF Center in Winter Park, Fla., and professor of obstetrics and gynecology at the University of Central Florida, Orlando.
 

References

1. Ambildhuke K et al. Cureus. 2022;1:14(11):e30990.

2. Fatemeh Z et al. Br J Radiol. 2021 Jun 1;94(1122):20201386.

3. Farhi J et al. Fertil Steril. 2007 Aug;88(2):396.

4. Honoré GM et al. Fertil Steril. 1999;71(5):785.

5. De Silva PM et al. Hum Reprod. 2017;32(4):836.

6. Namnoum A and Murphy A. “Diagnostic and Operative Laparoscopy,” in Te Linde’s Operative Gynecology, 8th ed. Philadelphia: Lippincott-Raven, 1997, pp. 389.

7. Camus E et al.Hum Reprod. 1999;14(5):1243.

8. Marana R et al. Hum Reprod. 1999;14(12):2991-5.

9. Johnson N et al. Cochrane Database Syst Rev. 2010 Jan 20;2010(1):CD002125.

10. Savaris RF et al. Fertil Steril. 2006 Jan;85(1):188.

11. Kontoravdis A et al. Fertil Steril. 2006;86(6):1642.

12. Sagoskin AW et al. Hum Reprod. 2003;18(12):2634.

13. Audebert A et al. Fertil Steril. 2014;102(4):1203.

14. Bildirici I et al. Hum Reprod. 2001;16(11):2422.

15. Practice Committee of the American Society for Reproductive Medicine. Fertil Steril. 2012;97(3):539.

According to the Centers for Disease Control and Preventions, in 2019 2.1% of all infants born in the United States were conceived by assisted reproductive technology (ART). Now 45 years old, ART, namely in vitro fertilization (IVF), is offered in nearly 500 clinics in the United States, contributing to over 300,000 treatment cycles per year.

A tubal factor is responsible for 30% of female infertility and may involve proximal and/or distal tubal occlusion, irrespective of pelvic adhesions.¹ Before the advent of IVF, the sole approach to the treatment of a tubal factor had been surgery. Given its success and minimal invasiveness, IVF is increasingly being offered to circumvent a tubal factor for infertility. This month we examine the utility of surgical treatment of tubal factor infertility. The options for fertility with a history of bilateral tubal ligation was covered in a prior Reproductive Rounds column.

Trolice_Mark _P_FLA_2022_web.jpg

Tubal disease and pelvic adhesions prevent the normal transport of the oocyte and sperm through the fallopian tube. The primary etiology of tubal factor infertility is pelvic inflammatory disease, mainly caused by chlamydia or gonorrhea. Other conditions that may interfere with tubal transport include severe endometriosis, adhesions from previous surgery, or nontubal infection (for example, appendicitis, inflammatory bowel disease), pelvic tuberculosis, and salpingitis isthmica nodosa (that is, diverticulosis of the fallopian tube).
 

Proximal tubal occlusion

During a hysterosalpingogram (HSG), transient uterine cornual spasm can result if a woman experiences significant uterine cramping, thereby resulting in a false-positive diagnosis of proximal tubal occlusion. When a repeat HSG is gently performed with slow instillation of contrast, uterine cramping is less likely, and the tubal patency rate is 60%. PTO may also result from plugs of mucus and amorphous debris, but this is not true occlusion.² In cases with unilateral PTO, controlled ovarian hyperstimulation with intrauterine insemination has resulted in pregnancy rates similar to those in patients with unexplained infertility.³

Reconstructive surgery for bilateral PTO has limited effectiveness and the risk of subsequent ectopic pregnancy is as high as 20%.⁴ A more successful option is fluoroscopic tubal catheterization (FTC), an outpatient procedure performed in a radiology or infertility center. FTC uses a coaxial catheter system where the outer catheter is guided through the tubal ostium and an inner catheter is atraumatically advanced to overcome the blockage. This procedure is 85% successful for tubal patency with 50% of patients conceiving in the first 12 months; one-third of time the tubes reocclude. After the reestablishment of patency with FTC, the chance of achieving a live birth is 22% and the risk of ectopic pregnancy is 4%.⁵

Treatment of distal tubal occlusion – the hydrosalpinx

Surgery for treating tubal factor infertility is most successful in women with distal tubal obstruction (DTO), often caused by a hydrosalpinx. Fimbrioplasty is the lysis of fimbrial adhesions or dilatation of fimbrial strictures; the tube is patent, but there are adhesive bands that surround the terminal end with preserved tubal rugae. Gentle introduction of an alligator laparoscopic forceps into the tubal ostium followed by opening and withdrawal of the forceps helps to stretch the tube and release minor degrees of fimbrial agglutination.⁶

A hydrosalpinx is diagnosed by DTO with dilation and intraluminal fluid accumulation along with the reduction/loss of endothelial cilia. Left untreated, a hydrosalpinx can lead to a 50% reduction in IVF pregnancy rates.⁷ Tube-sparing treatment involves neosalpingostomy to create a new tubal opening. A nonsurgical approach, ultrasound-guided aspiration of hydrosalpinges, has not been shown to significantly increase the rate of clinical pregnancy. Efficacy for improving fertility is generally poor, but depends upon tubal wall thickness, ampullary dilation, presence of mucosal folds, percentage of ciliated cells in the fimbrial end, and peritubal adhesions.⁸

Evidence supports that laparoscopic salpingectomy in women with hydrosalpinges improves the outcomes of IVF treatment, compared with no surgical intervention.⁹ The improvement in pregnancy and live birth rates likely stems from the elimination of the retrograde flow of embryotoxic fluid that disrupts implantation. Endometrial receptivity markers (endometrial cell adhesion molecules, integrins, and HOXA10) have been shown to be reduced in the presence of hydrosalpinx.¹⁰ A small, randomized trial demonstrated that bipolar diathermy prior to IVF improved pregnancy outcomes.¹¹ PTO was not more effective than salpingectomy. Conceptions, without IVF, have been reported following salpingectomy for unilateral hydrosalpinx.¹²

In a series including 434 patients with DTO who underwent laparoscopic fimbrioplasty (enlargement of the ostium) or neosalpingostomy (creation of a new ostium) by a single surgeon, 5-year actuarial delivery rates decreased as the severity of tubal occlusion increased; the ectopic rate was stable at approximately 15%.¹³ A prospective study reported that the relative increase in the pregnancy rate after salpingectomy was greatest in women with a large hydrosalpinx visible on ultrasound.¹⁴

Because of the possible risks of decreased ovarian reserve secondary to interruption of ovarian blood supply, salpingectomy should be done with minimal thermal injury and very close to the fallopian tube.

162178_graphic_web.png

Summary

Surgery may be considered for young women with mild distal tubal disease as one surgical procedure can lead to several pregnancies whereas IVF must be performed each time pregnancy is desired. IVF is more likely than surgery to be successful in women with bilateral hydrosalpinx, in those with pelvic adhesions, in older reproductive aged women, and for both proximal and distal tubal occlusion.¹⁵ An online prediction calculator from the Society for Assisted Reproductive Technology (SART) can be helpful in counseling patients on personalized expectations for IVF pregnancy outcomes.

Dr. Trolice is director of The IVF Center in Winter Park, Fla., and professor of obstetrics and gynecology at the University of Central Florida, Orlando.
 

References

1. Ambildhuke K et al. Cureus. 2022;1:14(11):e30990.

2. Fatemeh Z et al. Br J Radiol. 2021 Jun 1;94(1122):20201386.

3. Farhi J et al. Fertil Steril. 2007 Aug;88(2):396.

4. Honoré GM et al. Fertil Steril. 1999;71(5):785.

5. De Silva PM et al. Hum Reprod. 2017;32(4):836.

6. Namnoum A and Murphy A. “Diagnostic and Operative Laparoscopy,” in Te Linde’s Operative Gynecology, 8th ed. Philadelphia: Lippincott-Raven, 1997, pp. 389.

7. Camus E et al.Hum Reprod. 1999;14(5):1243.

8. Marana R et al. Hum Reprod. 1999;14(12):2991-5.

9. Johnson N et al. Cochrane Database Syst Rev. 2010 Jan 20;2010(1):CD002125.

10. Savaris RF et al. Fertil Steril. 2006 Jan;85(1):188.

11. Kontoravdis A et al. Fertil Steril. 2006;86(6):1642.

12. Sagoskin AW et al. Hum Reprod. 2003;18(12):2634.

13. Audebert A et al. Fertil Steril. 2014;102(4):1203.

14. Bildirici I et al. Hum Reprod. 2001;16(11):2422.

15. Practice Committee of the American Society for Reproductive Medicine. Fertil Steril. 2012;97(3):539.

According to the Centers for Disease Control and Preventions, in 2019 2.1% of all infants born in the United States were conceived by assisted reproductive technology (ART). Now 45 years old, ART, namely in vitro fertilization (IVF), is offered in nearly 500 clinics in the United States, contributing to over 300,000 treatment cycles per year.

A tubal factor is responsible for 30% of female infertility and may involve proximal and/or distal tubal occlusion, irrespective of pelvic adhesions.¹ Before the advent of IVF, the sole approach to the treatment of a tubal factor had been surgery. Given its success and minimal invasiveness, IVF is increasingly being offered to circumvent a tubal factor for infertility. This month we examine the utility of surgical treatment of tubal factor infertility. The options for fertility with a history of bilateral tubal ligation was covered in a prior Reproductive Rounds column.

Trolice_Mark _P_FLA_2022_web.jpg

Tubal disease and pelvic adhesions prevent the normal transport of the oocyte and sperm through the fallopian tube. The primary etiology of tubal factor infertility is pelvic inflammatory disease, mainly caused by chlamydia or gonorrhea. Other conditions that may interfere with tubal transport include severe endometriosis, adhesions from previous surgery, or nontubal infection (for example, appendicitis, inflammatory bowel disease), pelvic tuberculosis, and salpingitis isthmica nodosa (that is, diverticulosis of the fallopian tube).
 

Proximal tubal occlusion

During a hysterosalpingogram (HSG), transient uterine cornual spasm can result if a woman experiences significant uterine cramping, thereby resulting in a false-positive diagnosis of proximal tubal occlusion. When a repeat HSG is gently performed with slow instillation of contrast, uterine cramping is less likely, and the tubal patency rate is 60%. PTO may also result from plugs of mucus and amorphous debris, but this is not true occlusion.² In cases with unilateral PTO, controlled ovarian hyperstimulation with intrauterine insemination has resulted in pregnancy rates similar to those in patients with unexplained infertility.³

Reconstructive surgery for bilateral PTO has limited effectiveness and the risk of subsequent ectopic pregnancy is as high as 20%.⁴ A more successful option is fluoroscopic tubal catheterization (FTC), an outpatient procedure performed in a radiology or infertility center. FTC uses a coaxial catheter system where the outer catheter is guided through the tubal ostium and an inner catheter is atraumatically advanced to overcome the blockage. This procedure is 85% successful for tubal patency with 50% of patients conceiving in the first 12 months; one-third of time the tubes reocclude. After the reestablishment of patency with FTC, the chance of achieving a live birth is 22% and the risk of ectopic pregnancy is 4%.⁵

Treatment of distal tubal occlusion – the hydrosalpinx

Surgery for treating tubal factor infertility is most successful in women with distal tubal obstruction (DTO), often caused by a hydrosalpinx. Fimbrioplasty is the lysis of fimbrial adhesions or dilatation of fimbrial strictures; the tube is patent, but there are adhesive bands that surround the terminal end with preserved tubal rugae. Gentle introduction of an alligator laparoscopic forceps into the tubal ostium followed by opening and withdrawal of the forceps helps to stretch the tube and release minor degrees of fimbrial agglutination.⁶

A hydrosalpinx is diagnosed by DTO with dilation and intraluminal fluid accumulation along with the reduction/loss of endothelial cilia. Left untreated, a hydrosalpinx can lead to a 50% reduction in IVF pregnancy rates.⁷ Tube-sparing treatment involves neosalpingostomy to create a new tubal opening. A nonsurgical approach, ultrasound-guided aspiration of hydrosalpinges, has not been shown to significantly increase the rate of clinical pregnancy. Efficacy for improving fertility is generally poor, but depends upon tubal wall thickness, ampullary dilation, presence of mucosal folds, percentage of ciliated cells in the fimbrial end, and peritubal adhesions.⁸

Evidence supports that laparoscopic salpingectomy in women with hydrosalpinges improves the outcomes of IVF treatment, compared with no surgical intervention.⁹ The improvement in pregnancy and live birth rates likely stems from the elimination of the retrograde flow of embryotoxic fluid that disrupts implantation. Endometrial receptivity markers (endometrial cell adhesion molecules, integrins, and HOXA10) have been shown to be reduced in the presence of hydrosalpinx.¹⁰ A small, randomized trial demonstrated that bipolar diathermy prior to IVF improved pregnancy outcomes.¹¹ PTO was not more effective than salpingectomy. Conceptions, without IVF, have been reported following salpingectomy for unilateral hydrosalpinx.¹²

In a series including 434 patients with DTO who underwent laparoscopic fimbrioplasty (enlargement of the ostium) or neosalpingostomy (creation of a new ostium) by a single surgeon, 5-year actuarial delivery rates decreased as the severity of tubal occlusion increased; the ectopic rate was stable at approximately 15%.¹³ A prospective study reported that the relative increase in the pregnancy rate after salpingectomy was greatest in women with a large hydrosalpinx visible on ultrasound.¹⁴

Because of the possible risks of decreased ovarian reserve secondary to interruption of ovarian blood supply, salpingectomy should be done with minimal thermal injury and very close to the fallopian tube.

162178_graphic_web.png

Summary

Surgery may be considered for young women with mild distal tubal disease as one surgical procedure can lead to several pregnancies whereas IVF must be performed each time pregnancy is desired. IVF is more likely than surgery to be successful in women with bilateral hydrosalpinx, in those with pelvic adhesions, in older reproductive aged women, and for both proximal and distal tubal occlusion.¹⁵ An online prediction calculator from the Society for Assisted Reproductive Technology (SART) can be helpful in counseling patients on personalized expectations for IVF pregnancy outcomes.

Dr. Trolice is director of The IVF Center in Winter Park, Fla., and professor of obstetrics and gynecology at the University of Central Florida, Orlando.
 

References

1. Ambildhuke K et al. Cureus. 2022;1:14(11):e30990.

2. Fatemeh Z et al. Br J Radiol. 2021 Jun 1;94(1122):20201386.

3. Farhi J et al. Fertil Steril. 2007 Aug;88(2):396.

4. Honoré GM et al. Fertil Steril. 1999;71(5):785.

5. De Silva PM et al. Hum Reprod. 2017;32(4):836.

6. Namnoum A and Murphy A. “Diagnostic and Operative Laparoscopy,” in Te Linde’s Operative Gynecology, 8th ed. Philadelphia: Lippincott-Raven, 1997, pp. 389.

7. Camus E et al.Hum Reprod. 1999;14(5):1243.

8. Marana R et al. Hum Reprod. 1999;14(12):2991-5.

9. Johnson N et al. Cochrane Database Syst Rev. 2010 Jan 20;2010(1):CD002125.

10. Savaris RF et al. Fertil Steril. 2006 Jan;85(1):188.

11. Kontoravdis A et al. Fertil Steril. 2006;86(6):1642.

12. Sagoskin AW et al. Hum Reprod. 2003;18(12):2634.

13. Audebert A et al. Fertil Steril. 2014;102(4):1203.

14. Bildirici I et al. Hum Reprod. 2001;16(11):2422.

15. Practice Committee of the American Society for Reproductive Medicine. Fertil Steril. 2012;97(3):539.

For years, women’s health advocates have argued that far more research is needed on women’s bodies and health. The world’s first-ever “vagina on a chip,” recently developed at Harvard’s Wyss Institute for Biologically Inspired Engineering in Boston, could go a long way to making that happen. 

“Women’s health has not received the attention it deserves,” says Don Ingber, MD, PhD, who led the team that created the vagina chip. The advance quickly drew media attention after it was reported in the journal Microbiome. But researchers hope for more than headlines. They see the chip as a way to facilitate vaginal health research and open the door to vital new treatments. 

By now, you may have heard of “organs on chips”: tiny devices about the size of a flash drive that are designed to mimic the biological activity of human organs. These glass chips contain living human cells within grooves that allow the passage of fluid, to either maintain or disrupt the cells’ function. So far, Dr. Ingber and his team at the Wyss Institute have developed more than 15 organ chip models, including chips that mimic the lung, intestine, kidney, and bone marrow. 

The idea to develop a vagina chip grew out of research, funded by the Gates Foundation, on a childhood disease called environmental enteric dysfunction, an intestinal disease most commonly found in low-resource nations that is the second leading cause of death in children under 5. That’s when Dr. Ingber discovered just how much the child’s microbiome influences this disease. 

Stemming from that work, the Gates Foundation turned its attention to newborn health – in particular, the impact of bacterial vaginosis, an imbalance in the vagina’s bacterial makeup. Bacterial vaginosis occurs in one out of four women worldwide and has been linked to premature birth as well as HIV, HPV persistence, and cervical cancer. 

Upon establishing the Vaginal Microbiome Research Consortium,  the foundation asked Dr. Ingber to engineer an organ chip that mimicked the vagina’s microbiome. The goal was to test “live biotherapeutic products,” or living microbes like probiotics, that might restore the vagina’s microbiome to health.  

No other preclinical model exists to perform tests like that, says Dr. Ingber. 

“The vagina chip is a way to help make some advances,” he says. 

The Gates Foundation recognized that women’s reproductive health is a major issue, not only in low-income nations, but everywhere around the world. As the project evolved, Dr. Ingber began to hear from female colleagues about how neglected women’s reproductive health is in medical science. 

“It is something I became sensitive to and realized this is just the starting point,” Dr. Ingber says.

Take bacterial vaginosis, for example. Since 1982, treatment has revolved around the same two antibiotics. That’s partly because there is no animal model to study. No other species has the same vaginal bacterial community as humans do.

That makes developing any new therapy “incredibly challenging,” explains Caroline Mitchell, MD, MPH, an ob.gyn. at Massachusetts General Hospital, Boston, and a member of the consortium. 

It turns out, replicating the vagina in a lab dish is, to use the technical term, very hard. 

“That’s where a vagina chip offers an opportunity,” Dr. Mitchell says. “It’s not super-high throughput, but it’s way more high throughput than a [human] clinical trial.” 

As such, the vagina chip could help scientists find new treatments much faster. 

Like Dr. Ingber, Dr. Mitchell also sees the chip as a way to bring more attention to the largely unmet needs in female reproductive medicine.

“Women’s reproductive health has been under-resourced, under-prioritized, and largely disregarded for decades,” she says. And the time may be ripe for change: Dr. Mitchell says she was encouraged by the National Institutes of Health’s Advancing NIH Research on the Health of Women conference, held in 2021 in response to a congressional request to address women’s health research efforts.  

Beyond bacterial vaginosis, Dr. Mitchell imagines the chip could help scientists find new treatments for vaginal yeast infection (candidiasis), chlamydia, and endometriosis. As with bacterial vaginosis, medicines for vaginal yeast infections have not advanced in decades, Dr. Mitchell says.  Efforts to develop a vaccine for chlamydia – which can cause permanent damage to a woman’s reproductive system – have dragged on for many years. And endometriosis, an often painful condition in which the tissue that makes up the uterine lining grows outside the uterus, remains under-researched despite affecting 10% of childbearing-age women.

While some mouse models are used in chlamydia research, it’s hard to say if they’ll translate to humans, given the vaginal and cervical bacterial differences. 

“Our understanding of the basic physiology of the environment of the vagina and cervix is another area where we’re woefully ignorant,” Dr. Mitchell says.

To that end, Dr. Ingber’s team is developing more complex chips mimicking the vagina and the cervix. One of his team members wants to use the chips to study infertility. The researchers have already used the chips to see how bacterial vaginosis and mucous changes impact the way sperm migrates up the reproductive tract. 

The lab is now linking vagina and cervix chips together to study viral infections of the cervix, like HPV, and all types of bacterial diseases of the vaginal tract. By applying cervical mucus to the vagina chip, they hope to learn more about how female reproductive tissues respond to infection and inflammation.

“I always say that organ chips are like synthetic biology at the cell tissue and organ level,” says Dr. Ingber. “You start simple and see if you [can] mimic a clinical situation.” 

As they make the chips more complex – perhaps by adding blood vessel cells and female hormones – Dr. Ingber foresees being able to study the response to hormonal changes during the menstrual cycle.

“We can begin to explore the effects of cycling over time as well as other types of hormonal effects,” he says.

Dr. Ingber also envisions linking the vagina chip to other organ chips – he’s already succeeded in linking eight different organ types together. But for now, the team hopes the vagina chip will enhance our understanding of basic female reproductive biology and speed up the process of developing new treatments for women’s health. 

A version of this article first appeared on WebMD.com.

For years, women’s health advocates have argued that far more research is needed on women’s bodies and health. The world’s first-ever “vagina on a chip,” recently developed at Harvard’s Wyss Institute for Biologically Inspired Engineering in Boston, could go a long way to making that happen. 

“Women’s health has not received the attention it deserves,” says Don Ingber, MD, PhD, who led the team that created the vagina chip. The advance quickly drew media attention after it was reported in the journal Microbiome. But researchers hope for more than headlines. They see the chip as a way to facilitate vaginal health research and open the door to vital new treatments. 

By now, you may have heard of “organs on chips”: tiny devices about the size of a flash drive that are designed to mimic the biological activity of human organs. These glass chips contain living human cells within grooves that allow the passage of fluid, to either maintain or disrupt the cells’ function. So far, Dr. Ingber and his team at the Wyss Institute have developed more than 15 organ chip models, including chips that mimic the lung, intestine, kidney, and bone marrow. 

The idea to develop a vagina chip grew out of research, funded by the Gates Foundation, on a childhood disease called environmental enteric dysfunction, an intestinal disease most commonly found in low-resource nations that is the second leading cause of death in children under 5. That’s when Dr. Ingber discovered just how much the child’s microbiome influences this disease. 

Stemming from that work, the Gates Foundation turned its attention to newborn health – in particular, the impact of bacterial vaginosis, an imbalance in the vagina’s bacterial makeup. Bacterial vaginosis occurs in one out of four women worldwide and has been linked to premature birth as well as HIV, HPV persistence, and cervical cancer. 

Upon establishing the Vaginal Microbiome Research Consortium,  the foundation asked Dr. Ingber to engineer an organ chip that mimicked the vagina’s microbiome. The goal was to test “live biotherapeutic products,” or living microbes like probiotics, that might restore the vagina’s microbiome to health.  

No other preclinical model exists to perform tests like that, says Dr. Ingber. 

“The vagina chip is a way to help make some advances,” he says. 

The Gates Foundation recognized that women’s reproductive health is a major issue, not only in low-income nations, but everywhere around the world. As the project evolved, Dr. Ingber began to hear from female colleagues about how neglected women’s reproductive health is in medical science. 

“It is something I became sensitive to and realized this is just the starting point,” Dr. Ingber says.

Take bacterial vaginosis, for example. Since 1982, treatment has revolved around the same two antibiotics. That’s partly because there is no animal model to study. No other species has the same vaginal bacterial community as humans do.

That makes developing any new therapy “incredibly challenging,” explains Caroline Mitchell, MD, MPH, an ob.gyn. at Massachusetts General Hospital, Boston, and a member of the consortium. 

It turns out, replicating the vagina in a lab dish is, to use the technical term, very hard. 

“That’s where a vagina chip offers an opportunity,” Dr. Mitchell says. “It’s not super-high throughput, but it’s way more high throughput than a [human] clinical trial.” 

As such, the vagina chip could help scientists find new treatments much faster. 

Like Dr. Ingber, Dr. Mitchell also sees the chip as a way to bring more attention to the largely unmet needs in female reproductive medicine.

“Women’s reproductive health has been under-resourced, under-prioritized, and largely disregarded for decades,” she says. And the time may be ripe for change: Dr. Mitchell says she was encouraged by the National Institutes of Health’s Advancing NIH Research on the Health of Women conference, held in 2021 in response to a congressional request to address women’s health research efforts.  

Beyond bacterial vaginosis, Dr. Mitchell imagines the chip could help scientists find new treatments for vaginal yeast infection (candidiasis), chlamydia, and endometriosis. As with bacterial vaginosis, medicines for vaginal yeast infections have not advanced in decades, Dr. Mitchell says.  Efforts to develop a vaccine for chlamydia – which can cause permanent damage to a woman’s reproductive system – have dragged on for many years. And endometriosis, an often painful condition in which the tissue that makes up the uterine lining grows outside the uterus, remains under-researched despite affecting 10% of childbearing-age women.

While some mouse models are used in chlamydia research, it’s hard to say if they’ll translate to humans, given the vaginal and cervical bacterial differences. 

“Our understanding of the basic physiology of the environment of the vagina and cervix is another area where we’re woefully ignorant,” Dr. Mitchell says.

To that end, Dr. Ingber’s team is developing more complex chips mimicking the vagina and the cervix. One of his team members wants to use the chips to study infertility. The researchers have already used the chips to see how bacterial vaginosis and mucous changes impact the way sperm migrates up the reproductive tract. 

The lab is now linking vagina and cervix chips together to study viral infections of the cervix, like HPV, and all types of bacterial diseases of the vaginal tract. By applying cervical mucus to the vagina chip, they hope to learn more about how female reproductive tissues respond to infection and inflammation.

“I always say that organ chips are like synthetic biology at the cell tissue and organ level,” says Dr. Ingber. “You start simple and see if you [can] mimic a clinical situation.” 

As they make the chips more complex – perhaps by adding blood vessel cells and female hormones – Dr. Ingber foresees being able to study the response to hormonal changes during the menstrual cycle.

“We can begin to explore the effects of cycling over time as well as other types of hormonal effects,” he says.

Dr. Ingber also envisions linking the vagina chip to other organ chips – he’s already succeeded in linking eight different organ types together. But for now, the team hopes the vagina chip will enhance our understanding of basic female reproductive biology and speed up the process of developing new treatments for women’s health. 

A version of this article first appeared on WebMD.com.

For years, women’s health advocates have argued that far more research is needed on women’s bodies and health. The world’s first-ever “vagina on a chip,” recently developed at Harvard’s Wyss Institute for Biologically Inspired Engineering in Boston, could go a long way to making that happen. 

“Women’s health has not received the attention it deserves,” says Don Ingber, MD, PhD, who led the team that created the vagina chip. The advance quickly drew media attention after it was reported in the journal Microbiome. But researchers hope for more than headlines. They see the chip as a way to facilitate vaginal health research and open the door to vital new treatments. 

By now, you may have heard of “organs on chips”: tiny devices about the size of a flash drive that are designed to mimic the biological activity of human organs. These glass chips contain living human cells within grooves that allow the passage of fluid, to either maintain or disrupt the cells’ function. So far, Dr. Ingber and his team at the Wyss Institute have developed more than 15 organ chip models, including chips that mimic the lung, intestine, kidney, and bone marrow. 

The idea to develop a vagina chip grew out of research, funded by the Gates Foundation, on a childhood disease called environmental enteric dysfunction, an intestinal disease most commonly found in low-resource nations that is the second leading cause of death in children under 5. That’s when Dr. Ingber discovered just how much the child’s microbiome influences this disease. 

Stemming from that work, the Gates Foundation turned its attention to newborn health – in particular, the impact of bacterial vaginosis, an imbalance in the vagina’s bacterial makeup. Bacterial vaginosis occurs in one out of four women worldwide and has been linked to premature birth as well as HIV, HPV persistence, and cervical cancer. 

Upon establishing the Vaginal Microbiome Research Consortium,  the foundation asked Dr. Ingber to engineer an organ chip that mimicked the vagina’s microbiome. The goal was to test “live biotherapeutic products,” or living microbes like probiotics, that might restore the vagina’s microbiome to health.  

No other preclinical model exists to perform tests like that, says Dr. Ingber. 

“The vagina chip is a way to help make some advances,” he says. 

The Gates Foundation recognized that women’s reproductive health is a major issue, not only in low-income nations, but everywhere around the world. As the project evolved, Dr. Ingber began to hear from female colleagues about how neglected women’s reproductive health is in medical science. 

“It is something I became sensitive to and realized this is just the starting point,” Dr. Ingber says.

Take bacterial vaginosis, for example. Since 1982, treatment has revolved around the same two antibiotics. That’s partly because there is no animal model to study. No other species has the same vaginal bacterial community as humans do.

That makes developing any new therapy “incredibly challenging,” explains Caroline Mitchell, MD, MPH, an ob.gyn. at Massachusetts General Hospital, Boston, and a member of the consortium. 

It turns out, replicating the vagina in a lab dish is, to use the technical term, very hard. 

“That’s where a vagina chip offers an opportunity,” Dr. Mitchell says. “It’s not super-high throughput, but it’s way more high throughput than a [human] clinical trial.” 

As such, the vagina chip could help scientists find new treatments much faster. 

Like Dr. Ingber, Dr. Mitchell also sees the chip as a way to bring more attention to the largely unmet needs in female reproductive medicine.

“Women’s reproductive health has been under-resourced, under-prioritized, and largely disregarded for decades,” she says. And the time may be ripe for change: Dr. Mitchell says she was encouraged by the National Institutes of Health’s Advancing NIH Research on the Health of Women conference, held in 2021 in response to a congressional request to address women’s health research efforts.  

Beyond bacterial vaginosis, Dr. Mitchell imagines the chip could help scientists find new treatments for vaginal yeast infection (candidiasis), chlamydia, and endometriosis. As with bacterial vaginosis, medicines for vaginal yeast infections have not advanced in decades, Dr. Mitchell says.  Efforts to develop a vaccine for chlamydia – which can cause permanent damage to a woman’s reproductive system – have dragged on for many years. And endometriosis, an often painful condition in which the tissue that makes up the uterine lining grows outside the uterus, remains under-researched despite affecting 10% of childbearing-age women.

While some mouse models are used in chlamydia research, it’s hard to say if they’ll translate to humans, given the vaginal and cervical bacterial differences. 

“Our understanding of the basic physiology of the environment of the vagina and cervix is another area where we’re woefully ignorant,” Dr. Mitchell says.

To that end, Dr. Ingber’s team is developing more complex chips mimicking the vagina and the cervix. One of his team members wants to use the chips to study infertility. The researchers have already used the chips to see how bacterial vaginosis and mucous changes impact the way sperm migrates up the reproductive tract. 

The lab is now linking vagina and cervix chips together to study viral infections of the cervix, like HPV, and all types of bacterial diseases of the vaginal tract. By applying cervical mucus to the vagina chip, they hope to learn more about how female reproductive tissues respond to infection and inflammation.

“I always say that organ chips are like synthetic biology at the cell tissue and organ level,” says Dr. Ingber. “You start simple and see if you [can] mimic a clinical situation.” 

As they make the chips more complex – perhaps by adding blood vessel cells and female hormones – Dr. Ingber foresees being able to study the response to hormonal changes during the menstrual cycle.

“We can begin to explore the effects of cycling over time as well as other types of hormonal effects,” he says.

Dr. Ingber also envisions linking the vagina chip to other organ chips – he’s already succeeded in linking eight different organ types together. But for now, the team hopes the vagina chip will enhance our understanding of basic female reproductive biology and speed up the process of developing new treatments for women’s health. 

A version of this article first appeared on WebMD.com.

Roughly 4 decades after she first started menstruating, Elizabeth Flanagan finally underwent surgery to repair damage wreaked on her body by endometriosis. She’d spent years struggling with a variety of seemingly random symptoms, from migraines to excruciatingly painful periods to fatigue and irritable bowel syndrome. She’d worried about abnormal labs, including “extremely high” ANA, creatinine, and BUN blood test results that had been out of normal range for more than 10 years.

She was diagnosed with endometriosis in 2016, at age 47, after surgery to remove an ovarian cyst. Still, it took 5 more years before she landed in the office of a surgeon with the proper training to excise the lesions that continued to cause her so much anguish. That physician, Matthew Siedhoff, MD, at Cedars-Sinai Medical Center in Los Angeles, explained why her creatinine and BUN results were so far out of range: The endometriosis was impinging on her ureters.

The appointment left Ms. Flanagan with a range of emotions. “I was shocked that no doctor had identified this before, relieved knowing that I was finally in the hands of an expert who understood my condition, and saddened by the dearth of knowledge and proper treatment of endometriosis,” she wrote in an email.

Although the disease afflicts at least 1 out of every 10 women, endometriosis remains a conundrum for patients and their physicians. It often masquerades as other problems, from mental health issues such as anxiety and depression to physical issues such as irritable bowel syndrome. It often coexists with autoimmune conditions. Short of performing surgery, it can be a diagnosis of exclusion. And the existing, state-of-the-art treatment – hormone therapy that shuts down the reproductive system – doesn’t work for every woman every time.

“It is no wonder that it takes 10 years on average, from the time someone has symptoms of endometriosis, until they get a definitive diagnosis,” said Hugh Taylor, MD, chair of obstetrics, gynecology, and reproductive sciences at Yale University, New Haven, Conn. “It’s a combination of [physicians] not taking painful menses seriously and getting distracted by all these other manifestations of the disease throughout the whole body.”

Endometriosis, he said, “is a whole-body disease.”

But recent genetic research offers the tantalizing prospect of new diagnostic tools and treatments. In 5-10 years, scientists say, physicians may be able to diagnose the disease with a simple blood test, and treat it, for example, by preventing a gene receptor from initiating a cascade of inflammatory effects, or crafting treatments tailored to the molecular makeup of a patient’s disease.

“Tomorrow’s therapies will target specifically the molecular defects of endometriosis and be nonhormonal,” Dr. Taylor said.

Guidelines published last year by the European Society of Human Reproduction and Embryology detail the latest standards for diagnosis and treatment of endometriosis.

According to the guidelines, physicians should consider the diagnosis of endometriosis in individuals presenting with the following cyclical and noncyclical signs and symptoms: dysmenorrhea, deep dyspareunia, dysuria, dyschezia, painful rectal bleeding or hematuria, shoulder tip pain, catamenial pneumothorax, cyclical cough/hemoptysis/chest pain, cyclical scar swelling, and pain, fatigue, and infertility.

A clinical exam should be considered, as well as imaging such as ultrasound and/or MRI, the guidelines state, although negative findings should not rule out a diagnosis. Laparoscopy is also an option, particularly for patients who desire a definitive diagnosis or cannot be diagnosed any other way, “although negative histology [of endometriotic lesions] does not entirely rule out the disease,” the guidelines state.

To treat the pain associated with endometriosis, the guidelines advise, as a first-line therapy, beginning with NSAIDs and combined hormonal contraceptives (in oral, vaginal, or transdermal form). Another option is progesterone, including progesterone-only contraceptives, with a recommendation to prescribe a levonorgestrel-releasing intrauterine system or an etonogestrel-releasing subdermal implant to reduce endometriosis-associated pain.

However, progestins and low-dose oral contraceptives are “unsuccessful in a third of women,” Dr. Taylor and his coauthors wrote in a paper published in 2021 in The Lancet.

Until recently, the gold standard for second-line treatment of endometriosis was oral gonadotropin-releasing hormone (GnRH) agonists. These manage the disease by inducing medical menopause – they downregulate pituitary GnRH receptors to create a hypoestrogenic state characterized by low serum levels of luteinizing hormone (LH) and follicle-stimulating hormone (FSH). GnRH agonists may be administered nasally, or through daily, monthly, or trimonthly injections. But the Food and Drug Administration advises that, when used for longer than 6 months, GnRH agonists be paired with add-back hormone replacement therapy to reduce the risk of bone loss associated with the plunge in hormone levels. Also, treatment may not be appropriate for patients who, when suddenly forced into menopause, suffer from bothersome symptoms.

The latest treatment, GnRH antagonists, are new options for patients who either do not respond adequately to progestins and low-dose contraceptives or develop progesterone resistance, and want to avoid some of the risks and/or symptoms associated with GnRH agonists. Two advantages of GnRH antagonists for patients, Dr. Taylor said, are that they have a fast onset of action and are oral rather than injectable.

“These drugs [GnRH antagonists] cause competitive blockage of the GnRH receptor and hence dose-dependently suppress production of FSH and LH and inhibit secretion of ovarian steroid hormones without inducing a flare-up effect,” Belgian physicians and researchers Jacques Donnez, MD, and Marie-Madeleine Dolmans, MD, PhD, wrote in a paper published last year in the Journal of Clinical Medicine. “The mechanism is different from that of the GnRH agonist which, after a first phase of stimulation, desensitizes GnRH receptors, leading to full suppression of LH and FSH production and subsequently to complete suppression of [estrogen] to levels similar to those observed after bilateral oophorectomy.”

Patients who took Elagolix, the first oral nonpeptide GnRH antagonist available for the treatment of moderate to severe endometriosis-associated pain, had fewer vasomotor side effects and less bone density loss than those on the GnRH agonist leuprorelin, according to a 2018 study in Obstetrics and Gynecology. However, without add-back hormone-replacement therapy, GnRH antagonist use may need to be limited to 24 months, because of loss of bone density, a study in Cell Reports Medicine reported in 2022.

Attempting to explain the pathogenesis of endometriosis, and frustrated by the shortcomings of currently available therapies, researchers have turned to genetics for insight. A team of scientists led by Thomas Tapmeier, PhD, now a senior research fellow at Monash University in Australia, and Prof. Krina Zondervan at the University of Oxford, ran genetic analyses of families with a history of endometriosis, as well as rhesus macaques that spontaneously developed endometriosis. The research, published in Science Translational Medicine, identified NPSR1, the gene encoding neuropeptide S receptor 1, as one commonly associated with endometriosis. In trials with mouse models, they found that the NPSR1 inhibitor SHA 68R was able to reduce endometriosis-related inflammation and pain.

“It’s important to stress that there is no single gene that is responsible for endometriosis,” Dr. Tapmeier said in an interview. “This gene just has a higher frequency in people with endometriosis.”

The next step, then, would be to try to find a compound that would inhibit NPSR1 at some point, or a competitor to the ligand that binds to the receptor and blocks it, he said.

“We’re currently looking at compounds that might be able to inhibit the receptor signaling,” he said.

Such a therapy could potentially reduce the symptoms of endometriosis without interfering with the menstrual cycle and without introducing hormones that cause undesirable side effects in some patients.

“This might be a way to treat the pain and inflammation that goes with endometriosis, as well as leaving the possibility of pregnancy open,” he said.

Other researchers are searching for biomarkers of the disease, both to provide a definitive, nonsurgical diagnostic tool, and for potential, individualized treatment.

In a study published in Nature Genetics, researchers at Cedars-Sinai created a “cellular atlas” of endometriosis by analyzing nearly 400,000 individual cells from 21 patients, some of whom had the disease and some of whom did not. A new technology, single-cell genomics, allowed the scientists to profile the multiple cell types contributing to the disease.

“So the initial question we wanted to ask was about understanding how the cells look in endometriosis, compared to endometrium,” said Kate Lawrenson, PhD, an associate professor in the department of obstetrics and gynecology at Cedars-Sinai, and co–senior author of the study. “We know that they resemble the cells of the womb, but we really don’t understand if they behave the same. We had a good inkling that they would behave differently.”

It turned out they did: Cells of endometriosis interacted atypically with female hormones, compared with cells in the uterus, Dr. Lawrenson said.

“That helps us understand how, even when patients take contraceptive pills, which is a commonly prescribed therapy, it doesn’t always work, or sometimes it stops working after a while,” she said. The next step for researchers, she said, will be to pinpoint the specific causes of these altered interactions.

Meanwhile, the current research also points to diagnostic possibilities. “We were quite excited to see that multiple cell types and endometriosis are upregulating the same sets of genes,” she said. “That makes us optimistic that hopefully there are some protein gene products that are being made in abundance, and hopefully we can detect them in the blood stream. It might be that we could use that information to develop new biomarkers, or even risk stratification tools.”

In the future, a simple blood test could identify signs of endometriosis in at-risk patients and get them “fast-tracked to a specialist for evaluation,” she said. “Whereas now, they might go from PCP to gynecologist to a different gynecologist over the course of 5-10 years before they get that referral.”

This discovery, that endometrial cells use genes differently and cross-talk with nearby cells differently, presents new treatment possibilities. Maybe we can physically block how cells interact with nearby cells, Dr. Lawrenson said. One model for doing that, she said, would be antibody-based therapy, similar to the therapies now changing the treatment of cancer.

What’s most exciting, looking ahead 5-10 years, is that treatment for endometriosis in the future may be significantly more individualized, and less hormone-based, than it is today.

“What we need for endometriosis is more options for patients and something that is tailored to the molecular makeup of their disease rather than a process of trial and error,” she said.

Roughly 4 decades after she first started menstruating, Elizabeth Flanagan finally underwent surgery to repair damage wreaked on her body by endometriosis. She’d spent years struggling with a variety of seemingly random symptoms, from migraines to excruciatingly painful periods to fatigue and irritable bowel syndrome. She’d worried about abnormal labs, including “extremely high” ANA, creatinine, and BUN blood test results that had been out of normal range for more than 10 years.

She was diagnosed with endometriosis in 2016, at age 47, after surgery to remove an ovarian cyst. Still, it took 5 more years before she landed in the office of a surgeon with the proper training to excise the lesions that continued to cause her so much anguish. That physician, Matthew Siedhoff, MD, at Cedars-Sinai Medical Center in Los Angeles, explained why her creatinine and BUN results were so far out of range: The endometriosis was impinging on her ureters.

The appointment left Ms. Flanagan with a range of emotions. “I was shocked that no doctor had identified this before, relieved knowing that I was finally in the hands of an expert who understood my condition, and saddened by the dearth of knowledge and proper treatment of endometriosis,” she wrote in an email.

Although the disease afflicts at least 1 out of every 10 women, endometriosis remains a conundrum for patients and their physicians. It often masquerades as other problems, from mental health issues such as anxiety and depression to physical issues such as irritable bowel syndrome. It often coexists with autoimmune conditions. Short of performing surgery, it can be a diagnosis of exclusion. And the existing, state-of-the-art treatment – hormone therapy that shuts down the reproductive system – doesn’t work for every woman every time.

“It is no wonder that it takes 10 years on average, from the time someone has symptoms of endometriosis, until they get a definitive diagnosis,” said Hugh Taylor, MD, chair of obstetrics, gynecology, and reproductive sciences at Yale University, New Haven, Conn. “It’s a combination of [physicians] not taking painful menses seriously and getting distracted by all these other manifestations of the disease throughout the whole body.”

Endometriosis, he said, “is a whole-body disease.”

But recent genetic research offers the tantalizing prospect of new diagnostic tools and treatments. In 5-10 years, scientists say, physicians may be able to diagnose the disease with a simple blood test, and treat it, for example, by preventing a gene receptor from initiating a cascade of inflammatory effects, or crafting treatments tailored to the molecular makeup of a patient’s disease.

“Tomorrow’s therapies will target specifically the molecular defects of endometriosis and be nonhormonal,” Dr. Taylor said.

Guidelines published last year by the European Society of Human Reproduction and Embryology detail the latest standards for diagnosis and treatment of endometriosis.

According to the guidelines, physicians should consider the diagnosis of endometriosis in individuals presenting with the following cyclical and noncyclical signs and symptoms: dysmenorrhea, deep dyspareunia, dysuria, dyschezia, painful rectal bleeding or hematuria, shoulder tip pain, catamenial pneumothorax, cyclical cough/hemoptysis/chest pain, cyclical scar swelling, and pain, fatigue, and infertility.

A clinical exam should be considered, as well as imaging such as ultrasound and/or MRI, the guidelines state, although negative findings should not rule out a diagnosis. Laparoscopy is also an option, particularly for patients who desire a definitive diagnosis or cannot be diagnosed any other way, “although negative histology [of endometriotic lesions] does not entirely rule out the disease,” the guidelines state.

To treat the pain associated with endometriosis, the guidelines advise, as a first-line therapy, beginning with NSAIDs and combined hormonal contraceptives (in oral, vaginal, or transdermal form). Another option is progesterone, including progesterone-only contraceptives, with a recommendation to prescribe a levonorgestrel-releasing intrauterine system or an etonogestrel-releasing subdermal implant to reduce endometriosis-associated pain.

However, progestins and low-dose oral contraceptives are “unsuccessful in a third of women,” Dr. Taylor and his coauthors wrote in a paper published in 2021 in The Lancet.

Until recently, the gold standard for second-line treatment of endometriosis was oral gonadotropin-releasing hormone (GnRH) agonists. These manage the disease by inducing medical menopause – they downregulate pituitary GnRH receptors to create a hypoestrogenic state characterized by low serum levels of luteinizing hormone (LH) and follicle-stimulating hormone (FSH). GnRH agonists may be administered nasally, or through daily, monthly, or trimonthly injections. But the Food and Drug Administration advises that, when used for longer than 6 months, GnRH agonists be paired with add-back hormone replacement therapy to reduce the risk of bone loss associated with the plunge in hormone levels. Also, treatment may not be appropriate for patients who, when suddenly forced into menopause, suffer from bothersome symptoms.

The latest treatment, GnRH antagonists, are new options for patients who either do not respond adequately to progestins and low-dose contraceptives or develop progesterone resistance, and want to avoid some of the risks and/or symptoms associated with GnRH agonists. Two advantages of GnRH antagonists for patients, Dr. Taylor said, are that they have a fast onset of action and are oral rather than injectable.

“These drugs [GnRH antagonists] cause competitive blockage of the GnRH receptor and hence dose-dependently suppress production of FSH and LH and inhibit secretion of ovarian steroid hormones without inducing a flare-up effect,” Belgian physicians and researchers Jacques Donnez, MD, and Marie-Madeleine Dolmans, MD, PhD, wrote in a paper published last year in the Journal of Clinical Medicine. “The mechanism is different from that of the GnRH agonist which, after a first phase of stimulation, desensitizes GnRH receptors, leading to full suppression of LH and FSH production and subsequently to complete suppression of [estrogen] to levels similar to those observed after bilateral oophorectomy.”

Patients who took Elagolix, the first oral nonpeptide GnRH antagonist available for the treatment of moderate to severe endometriosis-associated pain, had fewer vasomotor side effects and less bone density loss than those on the GnRH agonist leuprorelin, according to a 2018 study in Obstetrics and Gynecology. However, without add-back hormone-replacement therapy, GnRH antagonist use may need to be limited to 24 months, because of loss of bone density, a study in Cell Reports Medicine reported in 2022.

Attempting to explain the pathogenesis of endometriosis, and frustrated by the shortcomings of currently available therapies, researchers have turned to genetics for insight. A team of scientists led by Thomas Tapmeier, PhD, now a senior research fellow at Monash University in Australia, and Prof. Krina Zondervan at the University of Oxford, ran genetic analyses of families with a history of endometriosis, as well as rhesus macaques that spontaneously developed endometriosis. The research, published in Science Translational Medicine, identified NPSR1, the gene encoding neuropeptide S receptor 1, as one commonly associated with endometriosis. In trials with mouse models, they found that the NPSR1 inhibitor SHA 68R was able to reduce endometriosis-related inflammation and pain.

“It’s important to stress that there is no single gene that is responsible for endometriosis,” Dr. Tapmeier said in an interview. “This gene just has a higher frequency in people with endometriosis.”

The next step, then, would be to try to find a compound that would inhibit NPSR1 at some point, or a competitor to the ligand that binds to the receptor and blocks it, he said.

“We’re currently looking at compounds that might be able to inhibit the receptor signaling,” he said.

Such a therapy could potentially reduce the symptoms of endometriosis without interfering with the menstrual cycle and without introducing hormones that cause undesirable side effects in some patients.

“This might be a way to treat the pain and inflammation that goes with endometriosis, as well as leaving the possibility of pregnancy open,” he said.

Other researchers are searching for biomarkers of the disease, both to provide a definitive, nonsurgical diagnostic tool, and for potential, individualized treatment.

In a study published in Nature Genetics, researchers at Cedars-Sinai created a “cellular atlas” of endometriosis by analyzing nearly 400,000 individual cells from 21 patients, some of whom had the disease and some of whom did not. A new technology, single-cell genomics, allowed the scientists to profile the multiple cell types contributing to the disease.

“So the initial question we wanted to ask was about understanding how the cells look in endometriosis, compared to endometrium,” said Kate Lawrenson, PhD, an associate professor in the department of obstetrics and gynecology at Cedars-Sinai, and co–senior author of the study. “We know that they resemble the cells of the womb, but we really don’t understand if they behave the same. We had a good inkling that they would behave differently.”

It turned out they did: Cells of endometriosis interacted atypically with female hormones, compared with cells in the uterus, Dr. Lawrenson said.

“That helps us understand how, even when patients take contraceptive pills, which is a commonly prescribed therapy, it doesn’t always work, or sometimes it stops working after a while,” she said. The next step for researchers, she said, will be to pinpoint the specific causes of these altered interactions.

Meanwhile, the current research also points to diagnostic possibilities. “We were quite excited to see that multiple cell types and endometriosis are upregulating the same sets of genes,” she said. “That makes us optimistic that hopefully there are some protein gene products that are being made in abundance, and hopefully we can detect them in the blood stream. It might be that we could use that information to develop new biomarkers, or even risk stratification tools.”

In the future, a simple blood test could identify signs of endometriosis in at-risk patients and get them “fast-tracked to a specialist for evaluation,” she said. “Whereas now, they might go from PCP to gynecologist to a different gynecologist over the course of 5-10 years before they get that referral.”

This discovery, that endometrial cells use genes differently and cross-talk with nearby cells differently, presents new treatment possibilities. Maybe we can physically block how cells interact with nearby cells, Dr. Lawrenson said. One model for doing that, she said, would be antibody-based therapy, similar to the therapies now changing the treatment of cancer.

What’s most exciting, looking ahead 5-10 years, is that treatment for endometriosis in the future may be significantly more individualized, and less hormone-based, than it is today.

“What we need for endometriosis is more options for patients and something that is tailored to the molecular makeup of their disease rather than a process of trial and error,” she said.

Roughly 4 decades after she first started menstruating, Elizabeth Flanagan finally underwent surgery to repair damage wreaked on her body by endometriosis. She’d spent years struggling with a variety of seemingly random symptoms, from migraines to excruciatingly painful periods to fatigue and irritable bowel syndrome. She’d worried about abnormal labs, including “extremely high” ANA, creatinine, and BUN blood test results that had been out of normal range for more than 10 years.

She was diagnosed with endometriosis in 2016, at age 47, after surgery to remove an ovarian cyst. Still, it took 5 more years before she landed in the office of a surgeon with the proper training to excise the lesions that continued to cause her so much anguish. That physician, Matthew Siedhoff, MD, at Cedars-Sinai Medical Center in Los Angeles, explained why her creatinine and BUN results were so far out of range: The endometriosis was impinging on her ureters.

The appointment left Ms. Flanagan with a range of emotions. “I was shocked that no doctor had identified this before, relieved knowing that I was finally in the hands of an expert who understood my condition, and saddened by the dearth of knowledge and proper treatment of endometriosis,” she wrote in an email.

Although the disease afflicts at least 1 out of every 10 women, endometriosis remains a conundrum for patients and their physicians. It often masquerades as other problems, from mental health issues such as anxiety and depression to physical issues such as irritable bowel syndrome. It often coexists with autoimmune conditions. Short of performing surgery, it can be a diagnosis of exclusion. And the existing, state-of-the-art treatment – hormone therapy that shuts down the reproductive system – doesn’t work for every woman every time.

“It is no wonder that it takes 10 years on average, from the time someone has symptoms of endometriosis, until they get a definitive diagnosis,” said Hugh Taylor, MD, chair of obstetrics, gynecology, and reproductive sciences at Yale University, New Haven, Conn. “It’s a combination of [physicians] not taking painful menses seriously and getting distracted by all these other manifestations of the disease throughout the whole body.”

Endometriosis, he said, “is a whole-body disease.”

But recent genetic research offers the tantalizing prospect of new diagnostic tools and treatments. In 5-10 years, scientists say, physicians may be able to diagnose the disease with a simple blood test, and treat it, for example, by preventing a gene receptor from initiating a cascade of inflammatory effects, or crafting treatments tailored to the molecular makeup of a patient’s disease.

“Tomorrow’s therapies will target specifically the molecular defects of endometriosis and be nonhormonal,” Dr. Taylor said.

Guidelines published last year by the European Society of Human Reproduction and Embryology detail the latest standards for diagnosis and treatment of endometriosis.

According to the guidelines, physicians should consider the diagnosis of endometriosis in individuals presenting with the following cyclical and noncyclical signs and symptoms: dysmenorrhea, deep dyspareunia, dysuria, dyschezia, painful rectal bleeding or hematuria, shoulder tip pain, catamenial pneumothorax, cyclical cough/hemoptysis/chest pain, cyclical scar swelling, and pain, fatigue, and infertility.

A clinical exam should be considered, as well as imaging such as ultrasound and/or MRI, the guidelines state, although negative findings should not rule out a diagnosis. Laparoscopy is also an option, particularly for patients who desire a definitive diagnosis or cannot be diagnosed any other way, “although negative histology [of endometriotic lesions] does not entirely rule out the disease,” the guidelines state.

To treat the pain associated with endometriosis, the guidelines advise, as a first-line therapy, beginning with NSAIDs and combined hormonal contraceptives (in oral, vaginal, or transdermal form). Another option is progesterone, including progesterone-only contraceptives, with a recommendation to prescribe a levonorgestrel-releasing intrauterine system or an etonogestrel-releasing subdermal implant to reduce endometriosis-associated pain.

However, progestins and low-dose oral contraceptives are “unsuccessful in a third of women,” Dr. Taylor and his coauthors wrote in a paper published in 2021 in The Lancet.

Until recently, the gold standard for second-line treatment of endometriosis was oral gonadotropin-releasing hormone (GnRH) agonists. These manage the disease by inducing medical menopause – they downregulate pituitary GnRH receptors to create a hypoestrogenic state characterized by low serum levels of luteinizing hormone (LH) and follicle-stimulating hormone (FSH). GnRH agonists may be administered nasally, or through daily, monthly, or trimonthly injections. But the Food and Drug Administration advises that, when used for longer than 6 months, GnRH agonists be paired with add-back hormone replacement therapy to reduce the risk of bone loss associated with the plunge in hormone levels. Also, treatment may not be appropriate for patients who, when suddenly forced into menopause, suffer from bothersome symptoms.

The latest treatment, GnRH antagonists, are new options for patients who either do not respond adequately to progestins and low-dose contraceptives or develop progesterone resistance, and want to avoid some of the risks and/or symptoms associated with GnRH agonists. Two advantages of GnRH antagonists for patients, Dr. Taylor said, are that they have a fast onset of action and are oral rather than injectable.

“These drugs [GnRH antagonists] cause competitive blockage of the GnRH receptor and hence dose-dependently suppress production of FSH and LH and inhibit secretion of ovarian steroid hormones without inducing a flare-up effect,” Belgian physicians and researchers Jacques Donnez, MD, and Marie-Madeleine Dolmans, MD, PhD, wrote in a paper published last year in the Journal of Clinical Medicine. “The mechanism is different from that of the GnRH agonist which, after a first phase of stimulation, desensitizes GnRH receptors, leading to full suppression of LH and FSH production and subsequently to complete suppression of [estrogen] to levels similar to those observed after bilateral oophorectomy.”

Patients who took Elagolix, the first oral nonpeptide GnRH antagonist available for the treatment of moderate to severe endometriosis-associated pain, had fewer vasomotor side effects and less bone density loss than those on the GnRH agonist leuprorelin, according to a 2018 study in Obstetrics and Gynecology. However, without add-back hormone-replacement therapy, GnRH antagonist use may need to be limited to 24 months, because of loss of bone density, a study in Cell Reports Medicine reported in 2022.

Attempting to explain the pathogenesis of endometriosis, and frustrated by the shortcomings of currently available therapies, researchers have turned to genetics for insight. A team of scientists led by Thomas Tapmeier, PhD, now a senior research fellow at Monash University in Australia, and Prof. Krina Zondervan at the University of Oxford, ran genetic analyses of families with a history of endometriosis, as well as rhesus macaques that spontaneously developed endometriosis. The research, published in Science Translational Medicine, identified NPSR1, the gene encoding neuropeptide S receptor 1, as one commonly associated with endometriosis. In trials with mouse models, they found that the NPSR1 inhibitor SHA 68R was able to reduce endometriosis-related inflammation and pain.

“It’s important to stress that there is no single gene that is responsible for endometriosis,” Dr. Tapmeier said in an interview. “This gene just has a higher frequency in people with endometriosis.”

The next step, then, would be to try to find a compound that would inhibit NPSR1 at some point, or a competitor to the ligand that binds to the receptor and blocks it, he said.

“We’re currently looking at compounds that might be able to inhibit the receptor signaling,” he said.

Such a therapy could potentially reduce the symptoms of endometriosis without interfering with the menstrual cycle and without introducing hormones that cause undesirable side effects in some patients.

“This might be a way to treat the pain and inflammation that goes with endometriosis, as well as leaving the possibility of pregnancy open,” he said.

Other researchers are searching for biomarkers of the disease, both to provide a definitive, nonsurgical diagnostic tool, and for potential, individualized treatment.

In a study published in Nature Genetics, researchers at Cedars-Sinai created a “cellular atlas” of endometriosis by analyzing nearly 400,000 individual cells from 21 patients, some of whom had the disease and some of whom did not. A new technology, single-cell genomics, allowed the scientists to profile the multiple cell types contributing to the disease.

“So the initial question we wanted to ask was about understanding how the cells look in endometriosis, compared to endometrium,” said Kate Lawrenson, PhD, an associate professor in the department of obstetrics and gynecology at Cedars-Sinai, and co–senior author of the study. “We know that they resemble the cells of the womb, but we really don’t understand if they behave the same. We had a good inkling that they would behave differently.”

It turned out they did: Cells of endometriosis interacted atypically with female hormones, compared with cells in the uterus, Dr. Lawrenson said.

“That helps us understand how, even when patients take contraceptive pills, which is a commonly prescribed therapy, it doesn’t always work, or sometimes it stops working after a while,” she said. The next step for researchers, she said, will be to pinpoint the specific causes of these altered interactions.

Meanwhile, the current research also points to diagnostic possibilities. “We were quite excited to see that multiple cell types and endometriosis are upregulating the same sets of genes,” she said. “That makes us optimistic that hopefully there are some protein gene products that are being made in abundance, and hopefully we can detect them in the blood stream. It might be that we could use that information to develop new biomarkers, or even risk stratification tools.”

In the future, a simple blood test could identify signs of endometriosis in at-risk patients and get them “fast-tracked to a specialist for evaluation,” she said. “Whereas now, they might go from PCP to gynecologist to a different gynecologist over the course of 5-10 years before they get that referral.”

This discovery, that endometrial cells use genes differently and cross-talk with nearby cells differently, presents new treatment possibilities. Maybe we can physically block how cells interact with nearby cells, Dr. Lawrenson said. One model for doing that, she said, would be antibody-based therapy, similar to the therapies now changing the treatment of cancer.

What’s most exciting, looking ahead 5-10 years, is that treatment for endometriosis in the future may be significantly more individualized, and less hormone-based, than it is today.

“What we need for endometriosis is more options for patients and something that is tailored to the molecular makeup of their disease rather than a process of trial and error,” she said.

Pain is classified as chronic when it lasts or recurs for more than 3-6 months (“Classification of chronic pain” 2nd ed. Seattle: IASP Press, 1994). This universally accepted definition does not distinguish between physical and emotional pain. Categorically, pain is pain. Two prevalent chronic gynecologic diseases are closely related medically and emotionally. Forty percent to 50% of women with endometriosis have infertility; 30%-50% of women with infertility are found to have coexisting endometriosis. The approach to both is, typically, symptomatic treatment. In this month’s column, I examine the relationship between these ailments and how we can advise women on management.

Endometriosis is simply defined as the displacement of normal endometrial glands and stroma from their natural anatomical location to elsewhere in the body. With the recent identification of the disease in the spleen, endometriosis has been found in every organ system. Endometriosis is identified in 6%-10% of the general female population. The prevalence ranges from 2% to 11% among asymptomatic women and from 5% to 21% in women hospitalized for pelvic pain (Best Pract Res Clin Obstet Gynaecol. 2018;51:1-15). Compared with fertile women, infertile women are six to eight times more likely to have endometriosis (Fertil Steril. 2012;98:591-8).

Trolice_Mark _P_FLA_2022_web.jpg

Retrograde menstruation is the presumed theory for the origins of endometriosis, that is, the reflux of menstrual debris containing active endometrial cells through the fallopian tubes into the peritoneal cavity (Am J Obstet Gynecol. 1927;14:422-69). Because of the varied etiologies of the most common symptoms of endometriosis, dysmenorrhea, dyspareunia, dyschezia, and infertility, women visit, on average, seven physicians before being diagnosed (Fertil Steril. 2011;96:366). The delay in promptly identifying endometriosis is further impaired by the lack of specific biomarkers, awareness, and inadequate evaluation (N Engl J Med. 2020;382:1244-56).

The 2008 U.S. health care costs for endometriosis were approximately $4,000 per affected woman, analogous to the costs for other chronic conditions such as type 2 diabetes, Crohn’s disease, and rheumatoid arthritis (Hum Reprod. 2012;27:1292-9). The management of symptoms further increases the financial burden because of the effect of the disease on physical, mental, sexual, and social well-being, as well as productivity (Health Qual Life Outcomes. 2019;17:123).

We have known the paradoxical relationship between the stage of endometriosis and symptoms: Women with low-stage disease may present with severe pain and/or infertility but those with advanced-stage disease may be asymptomatic. Endometriotic cells and tissue elicit a localized immune and inflammatory response with the production of cytokines, chemokines, and prostaglandins. Given the usual intra-abdominal location and the small size of implants, endometriosis requires a surgical diagnosis, ideally with histopathology for confirmation. However, imaging – transvaginal ultrasound or MRI – has more than 90% sensitivity and specificity for identifying endometriomas (Cochrane Database Syst Rev. 2016;2[2]:CD009591).

The effect of endometriosis on fertility, particularly in women with minimal to mild stages, is not clear, and many studies have been retrospective. Tubal factor infertility can be a result of endometriosis. Per the 2020 Cochrane Database Systemic Reviews (2020 Oct;2020[10]:CD011031), “Compared to diagnostic laparoscopy only, it is uncertain whether laparoscopic surgery reduces overall pain associated with minimal to severe endometriosis; no data were reported on live birth. There is moderate-quality evidence that laparoscopic surgery increases viable intrauterine pregnancy rates confirmed by ultrasound compared to diagnostic laparoscopy only.” In women undergoing IVF, more advanced stages of endometriosis have reduced pregnancy outcomes as shown in recent meta-analyses (Obstet Gynecol. 2015;125:79-88).

The revised ASRM (rASRM) surgical staging classification of endometriosis has been widely used to describe the degree, although it poorly correlates with fertility potential (Fertil Steril. 2012;98:591-8). Women diagnosed with endometriosis may benefit from the Endometriosis Fertility Index (EFI), published in 2010 as a useful scoring system to predict postoperative non-IVF pregnancy rates (both by natural means and intrauterine insemination) based on patient characteristics, rASRM staging and “least function” score of the adnexa (Fertil Steril. 2010;94:1609-15).

Compared with diagnostic laparoscopy only, it is uncertain whether laparoscopic surgery reduces overall pain associated with minimal to severe endometriosis. “Further research is needed considering the management of different subtypes of endometriosis and comparing laparoscopic interventions with lifestyle and medical interventions (Cochrane Database Syst Rev. 2020 Oct;2020[10]:CD011031).”

The treatment of endometriosis is directly related to the desire for and timing of fertility since therapy is often contraceptive, as opposed to surgery. Because endometriosis is exacerbated by estradiol, the mainstay of medical therapy is initially combined hormonal or progestin-only contraception as a means of reducing pelvic pain by reducing estradiol production and action, respectively. GnRH-agonist suppression of follicle stimulation hormone and luteinizing hormone remains the standard for inactivating endogenous estradiol. In 2018, the U.S. Food and Drug Administration approved elagolix for the treatment of pain associated with endometriosis – the first pill specifically approved for endometriosis pain relief. An off-label approach for women is letrozole, the aromatase inhibitor, to reduce circulating estradiol levels. Unfortunately, estradiol suppression cannot be used solely long term without add-back therapy, because of the risk of bone loss and vasomotor symptoms.

Excision of endometriomas adversely affects ovarian follicular reserve (as indicated by lower levels of anti-müllerian hormone and reduced ovarian antral follicle counts on ultrasound). For women who want to preserve their fertility, the potential benefits of surgery should be weighed against these negative effects. Surgical treatment of endometriosis in women without other identifiable infertility factors may improve rates of spontaneous pregnancy. In women with moderate to severe endometriosis, intrauterine insemination with ovarian stimulation may be of value, particularly with preceding GnRH-agonist therapy (J Endometr Pelvic Pain Disord. 2018;10[3]:158-73).

Despite the reduction in IVF outcomes in women with moderate to severe endometriosis, it remains unclear whether surgery improves the likelihood of pregnancy with IVF as does the concurrent use of prolonged GnRH agonist during IVF stimulation. (Fertil Steril. 2012;98:591-8).

Summary

• Medical therapy alone does not appear to improve fertility in endometriosis.
• Surgical treatment of endometriosis improves natural fertility, particularly in lower-stage endometriosis.
• EFI is a useful tool to predict postoperative natural fertility and assess the need for IVF.
• Despite advanced endometriosis reducing IVF outcomes, surgery or medical pretreatment to increase IVF success remains unproven.

Dr. Trolice is director of The IVF Center in Winter Park, Fla., and professor of obstetrics and gynecology at the University of Central Florida, Orlando.

Pain is classified as chronic when it lasts or recurs for more than 3-6 months (“Classification of chronic pain” 2nd ed. Seattle: IASP Press, 1994). This universally accepted definition does not distinguish between physical and emotional pain. Categorically, pain is pain. Two prevalent chronic gynecologic diseases are closely related medically and emotionally. Forty percent to 50% of women with endometriosis have infertility; 30%-50% of women with infertility are found to have coexisting endometriosis. The approach to both is, typically, symptomatic treatment. In this month’s column, I examine the relationship between these ailments and how we can advise women on management.

Endometriosis is simply defined as the displacement of normal endometrial glands and stroma from their natural anatomical location to elsewhere in the body. With the recent identification of the disease in the spleen, endometriosis has been found in every organ system. Endometriosis is identified in 6%-10% of the general female population. The prevalence ranges from 2% to 11% among asymptomatic women and from 5% to 21% in women hospitalized for pelvic pain (Best Pract Res Clin Obstet Gynaecol. 2018;51:1-15). Compared with fertile women, infertile women are six to eight times more likely to have endometriosis (Fertil Steril. 2012;98:591-8).

Trolice_Mark _P_FLA_2022_web.jpg

Retrograde menstruation is the presumed theory for the origins of endometriosis, that is, the reflux of menstrual debris containing active endometrial cells through the fallopian tubes into the peritoneal cavity (Am J Obstet Gynecol. 1927;14:422-69). Because of the varied etiologies of the most common symptoms of endometriosis, dysmenorrhea, dyspareunia, dyschezia, and infertility, women visit, on average, seven physicians before being diagnosed (Fertil Steril. 2011;96:366). The delay in promptly identifying endometriosis is further impaired by the lack of specific biomarkers, awareness, and inadequate evaluation (N Engl J Med. 2020;382:1244-56).

The 2008 U.S. health care costs for endometriosis were approximately $4,000 per affected woman, analogous to the costs for other chronic conditions such as type 2 diabetes, Crohn’s disease, and rheumatoid arthritis (Hum Reprod. 2012;27:1292-9). The management of symptoms further increases the financial burden because of the effect of the disease on physical, mental, sexual, and social well-being, as well as productivity (Health Qual Life Outcomes. 2019;17:123).

We have known the paradoxical relationship between the stage of endometriosis and symptoms: Women with low-stage disease may present with severe pain and/or infertility but those with advanced-stage disease may be asymptomatic. Endometriotic cells and tissue elicit a localized immune and inflammatory response with the production of cytokines, chemokines, and prostaglandins. Given the usual intra-abdominal location and the small size of implants, endometriosis requires a surgical diagnosis, ideally with histopathology for confirmation. However, imaging – transvaginal ultrasound or MRI – has more than 90% sensitivity and specificity for identifying endometriomas (Cochrane Database Syst Rev. 2016;2[2]:CD009591).

The effect of endometriosis on fertility, particularly in women with minimal to mild stages, is not clear, and many studies have been retrospective. Tubal factor infertility can be a result of endometriosis. Per the 2020 Cochrane Database Systemic Reviews (2020 Oct;2020[10]:CD011031), “Compared to diagnostic laparoscopy only, it is uncertain whether laparoscopic surgery reduces overall pain associated with minimal to severe endometriosis; no data were reported on live birth. There is moderate-quality evidence that laparoscopic surgery increases viable intrauterine pregnancy rates confirmed by ultrasound compared to diagnostic laparoscopy only.” In women undergoing IVF, more advanced stages of endometriosis have reduced pregnancy outcomes as shown in recent meta-analyses (Obstet Gynecol. 2015;125:79-88).

The revised ASRM (rASRM) surgical staging classification of endometriosis has been widely used to describe the degree, although it poorly correlates with fertility potential (Fertil Steril. 2012;98:591-8). Women diagnosed with endometriosis may benefit from the Endometriosis Fertility Index (EFI), published in 2010 as a useful scoring system to predict postoperative non-IVF pregnancy rates (both by natural means and intrauterine insemination) based on patient characteristics, rASRM staging and “least function” score of the adnexa (Fertil Steril. 2010;94:1609-15).

Compared with diagnostic laparoscopy only, it is uncertain whether laparoscopic surgery reduces overall pain associated with minimal to severe endometriosis. “Further research is needed considering the management of different subtypes of endometriosis and comparing laparoscopic interventions with lifestyle and medical interventions (Cochrane Database Syst Rev. 2020 Oct;2020[10]:CD011031).”

The treatment of endometriosis is directly related to the desire for and timing of fertility since therapy is often contraceptive, as opposed to surgery. Because endometriosis is exacerbated by estradiol, the mainstay of medical therapy is initially combined hormonal or progestin-only contraception as a means of reducing pelvic pain by reducing estradiol production and action, respectively. GnRH-agonist suppression of follicle stimulation hormone and luteinizing hormone remains the standard for inactivating endogenous estradiol. In 2018, the U.S. Food and Drug Administration approved elagolix for the treatment of pain associated with endometriosis – the first pill specifically approved for endometriosis pain relief. An off-label approach for women is letrozole, the aromatase inhibitor, to reduce circulating estradiol levels. Unfortunately, estradiol suppression cannot be used solely long term without add-back therapy, because of the risk of bone loss and vasomotor symptoms.

Excision of endometriomas adversely affects ovarian follicular reserve (as indicated by lower levels of anti-müllerian hormone and reduced ovarian antral follicle counts on ultrasound). For women who want to preserve their fertility, the potential benefits of surgery should be weighed against these negative effects. Surgical treatment of endometriosis in women without other identifiable infertility factors may improve rates of spontaneous pregnancy. In women with moderate to severe endometriosis, intrauterine insemination with ovarian stimulation may be of value, particularly with preceding GnRH-agonist therapy (J Endometr Pelvic Pain Disord. 2018;10[3]:158-73).

Despite the reduction in IVF outcomes in women with moderate to severe endometriosis, it remains unclear whether surgery improves the likelihood of pregnancy with IVF as does the concurrent use of prolonged GnRH agonist during IVF stimulation. (Fertil Steril. 2012;98:591-8).

Summary

• Medical therapy alone does not appear to improve fertility in endometriosis.
• Surgical treatment of endometriosis improves natural fertility, particularly in lower-stage endometriosis.
• EFI is a useful tool to predict postoperative natural fertility and assess the need for IVF.
• Despite advanced endometriosis reducing IVF outcomes, surgery or medical pretreatment to increase IVF success remains unproven.

Dr. Trolice is director of The IVF Center in Winter Park, Fla., and professor of obstetrics and gynecology at the University of Central Florida, Orlando.

Pain is classified as chronic when it lasts or recurs for more than 3-6 months (“Classification of chronic pain” 2nd ed. Seattle: IASP Press, 1994). This universally accepted definition does not distinguish between physical and emotional pain. Categorically, pain is pain. Two prevalent chronic gynecologic diseases are closely related medically and emotionally. Forty percent to 50% of women with endometriosis have infertility; 30%-50% of women with infertility are found to have coexisting endometriosis. The approach to both is, typically, symptomatic treatment. In this month’s column, I examine the relationship between these ailments and how we can advise women on management.

Endometriosis is simply defined as the displacement of normal endometrial glands and stroma from their natural anatomical location to elsewhere in the body. With the recent identification of the disease in the spleen, endometriosis has been found in every organ system. Endometriosis is identified in 6%-10% of the general female population. The prevalence ranges from 2% to 11% among asymptomatic women and from 5% to 21% in women hospitalized for pelvic pain (Best Pract Res Clin Obstet Gynaecol. 2018;51:1-15). Compared with fertile women, infertile women are six to eight times more likely to have endometriosis (Fertil Steril. 2012;98:591-8).

Trolice_Mark _P_FLA_2022_web.jpg

Retrograde menstruation is the presumed theory for the origins of endometriosis, that is, the reflux of menstrual debris containing active endometrial cells through the fallopian tubes into the peritoneal cavity (Am J Obstet Gynecol. 1927;14:422-69). Because of the varied etiologies of the most common symptoms of endometriosis, dysmenorrhea, dyspareunia, dyschezia, and infertility, women visit, on average, seven physicians before being diagnosed (Fertil Steril. 2011;96:366). The delay in promptly identifying endometriosis is further impaired by the lack of specific biomarkers, awareness, and inadequate evaluation (N Engl J Med. 2020;382:1244-56).

The 2008 U.S. health care costs for endometriosis were approximately $4,000 per affected woman, analogous to the costs for other chronic conditions such as type 2 diabetes, Crohn’s disease, and rheumatoid arthritis (Hum Reprod. 2012;27:1292-9). The management of symptoms further increases the financial burden because of the effect of the disease on physical, mental, sexual, and social well-being, as well as productivity (Health Qual Life Outcomes. 2019;17:123).

We have known the paradoxical relationship between the stage of endometriosis and symptoms: Women with low-stage disease may present with severe pain and/or infertility but those with advanced-stage disease may be asymptomatic. Endometriotic cells and tissue elicit a localized immune and inflammatory response with the production of cytokines, chemokines, and prostaglandins. Given the usual intra-abdominal location and the small size of implants, endometriosis requires a surgical diagnosis, ideally with histopathology for confirmation. However, imaging – transvaginal ultrasound or MRI – has more than 90% sensitivity and specificity for identifying endometriomas (Cochrane Database Syst Rev. 2016;2[2]:CD009591).

The effect of endometriosis on fertility, particularly in women with minimal to mild stages, is not clear, and many studies have been retrospective. Tubal factor infertility can be a result of endometriosis. Per the 2020 Cochrane Database Systemic Reviews (2020 Oct;2020[10]:CD011031), “Compared to diagnostic laparoscopy only, it is uncertain whether laparoscopic surgery reduces overall pain associated with minimal to severe endometriosis; no data were reported on live birth. There is moderate-quality evidence that laparoscopic surgery increases viable intrauterine pregnancy rates confirmed by ultrasound compared to diagnostic laparoscopy only.” In women undergoing IVF, more advanced stages of endometriosis have reduced pregnancy outcomes as shown in recent meta-analyses (Obstet Gynecol. 2015;125:79-88).

The revised ASRM (rASRM) surgical staging classification of endometriosis has been widely used to describe the degree, although it poorly correlates with fertility potential (Fertil Steril. 2012;98:591-8). Women diagnosed with endometriosis may benefit from the Endometriosis Fertility Index (EFI), published in 2010 as a useful scoring system to predict postoperative non-IVF pregnancy rates (both by natural means and intrauterine insemination) based on patient characteristics, rASRM staging and “least function” score of the adnexa (Fertil Steril. 2010;94:1609-15).

Compared with diagnostic laparoscopy only, it is uncertain whether laparoscopic surgery reduces overall pain associated with minimal to severe endometriosis. “Further research is needed considering the management of different subtypes of endometriosis and comparing laparoscopic interventions with lifestyle and medical interventions (Cochrane Database Syst Rev. 2020 Oct;2020[10]:CD011031).”

The treatment of endometriosis is directly related to the desire for and timing of fertility since therapy is often contraceptive, as opposed to surgery. Because endometriosis is exacerbated by estradiol, the mainstay of medical therapy is initially combined hormonal or progestin-only contraception as a means of reducing pelvic pain by reducing estradiol production and action, respectively. GnRH-agonist suppression of follicle stimulation hormone and luteinizing hormone remains the standard for inactivating endogenous estradiol. In 2018, the U.S. Food and Drug Administration approved elagolix for the treatment of pain associated with endometriosis – the first pill specifically approved for endometriosis pain relief. An off-label approach for women is letrozole, the aromatase inhibitor, to reduce circulating estradiol levels. Unfortunately, estradiol suppression cannot be used solely long term without add-back therapy, because of the risk of bone loss and vasomotor symptoms.

Excision of endometriomas adversely affects ovarian follicular reserve (as indicated by lower levels of anti-müllerian hormone and reduced ovarian antral follicle counts on ultrasound). For women who want to preserve their fertility, the potential benefits of surgery should be weighed against these negative effects. Surgical treatment of endometriosis in women without other identifiable infertility factors may improve rates of spontaneous pregnancy. In women with moderate to severe endometriosis, intrauterine insemination with ovarian stimulation may be of value, particularly with preceding GnRH-agonist therapy (J Endometr Pelvic Pain Disord. 2018;10[3]:158-73).

Despite the reduction in IVF outcomes in women with moderate to severe endometriosis, it remains unclear whether surgery improves the likelihood of pregnancy with IVF as does the concurrent use of prolonged GnRH agonist during IVF stimulation. (Fertil Steril. 2012;98:591-8).

Summary

• Medical therapy alone does not appear to improve fertility in endometriosis.
• Surgical treatment of endometriosis improves natural fertility, particularly in lower-stage endometriosis.
• EFI is a useful tool to predict postoperative natural fertility and assess the need for IVF.
• Despite advanced endometriosis reducing IVF outcomes, surgery or medical pretreatment to increase IVF success remains unproven.

Dr. Trolice is director of The IVF Center in Winter Park, Fla., and professor of obstetrics and gynecology at the University of Central Florida, Orlando.

Radical resection of deep infiltrating endometriosis (DIE) or pelvic malignancies can lead to inadvertent damage to the pelvic autonomic nerve bundles, causing urinary dysfunction in up to 41% of cases, as well as anorectal and sexual dysfunction.¹ Each of these sequelae can significantly affect the patient’s quality of life.

Nerve-sparing techniques have therefore been a trending topic in gynecologic surgery in the 21st century, starting with papers by Marc Possover, MD, of Switzerland, on the laparoscopic neuronavigation (LANN) technique. In an important 2005 publication, he described how the LANN technique can significantly reduce postoperative functional morbidity in laparoscopic radical pelvic surgery.²

Lemos_Nucelio_TORONTO_web.jpg

The LANN method utilizes intraoperative neurostimulation to identify and dissect the intrapelvic nerve bundles away from surrounding tissue prior to dissection of the DIE or pelvic malignancies. The nerves are exposed and preserved under direct visualization in a fashion similar to that used to expose and preserve the ureters. Pelvic dissection using the LANN technique is extensive and occurs down to the level of the sacral nerve roots.

Dr. Possover’s 2005 paper and others like it spurred increased awareness of the intrapelvic part of the autonomic nervous system – in particular, the hypogastric nerves, the pelvic splanchnic nerves, and the inferior hypogastric plexus. Across additional published studies, nerve-sparing techniques were shown to be effective in preserving neurologic pelvic functions, with significantly less urinary retention and rectal/sexual dysfunction than seen with traditional laparoscopy techniques.

For example, in a single-center prospective clinical trial reported in 2012, 56 of 65 (86.2%) patients treated with a classical laparoscopic technique for excision of DIE reported neurologic pelvic dysfunctions, compared with 1 of 61 (1.6%) patients treated with a nerve-sparing approach.³

While research has confirmed the importance of nerve-sparing techniques, it also shone light on the reality that the LANN technique is extremely technically challenging and requires a high level of surgical expertise and advanced training. In my teaching of the technique, I also saw that few gynecologic surgeons were able to incorporate the advanced nerve-sparing technique into their practices.

A group consisting of myself and collaborators at the University of Bologna, Italy, and the University of Cambridge, England, recently developed an alternative to the LANN approach that uses the hypogastric nerves as landmarks. The technique requires less dissection and should be technically achievable when the pelvic neuroanatomy and anatomy of the presacral fascia are well understood. The hypogastric nerve is identified and used as a landmark to preserve the deeper autonomic nerve bundles in the pelvis without exposure and without more extensive dissection to the level of the sacral nerve roots.^4,5

This hypogastric nerve-based technique will cover the vast majority of radical surgeries for DIE. When more advanced nerve sparing and more extensive dissection is needed for the very deepest levels of disease infiltration, patients can be referred to surgeons with advanced training, comfort, and experience with the LANN technique.
 

The pelvic neuroanatomy

As described in our video articles published in 2015 in Fertility and Sterility⁶ and 2019 in the Journal of Minimally Invasive Gynecology,⁵ the left and right hypogastric nerves are the main sympathetic nerves of the autonomic nervous system in the pelvis. They originate from the superior hypogastric plexus and, at the level of the middle rectal vessels, they join the pelvic sacral splanchnic nerves to form the inferior hypogastric plexus. They are easily identifiable at their origin and are the most superficial and readily identifiable component of the inferior hypogastric plexus.

159156_Fig 1_web.jpg

The sympathetic input from the hypogastric nerves causes the internal urethral and anal sphincters to contract, as well as detrusor relaxation and a reduction of peristalsis of the descending colon, sigmoid, and rectum; thus, hypogastric nerve input promotes continence.

The hypogastric nerves also carry afferent signals for pelvic visceral proprioception. Lesion to the hypogastric nerves will usually be subclinical and will put the patient at risk for unnoticeable bladder distension, which usually becomes symptomatic about 7 years after the procedure.⁷

159156_Fig 2_web.JPG

The thin pelvic splanchnic nerves – which merge with the hypogastric nerves into the pararectal fossae to form the inferior hypogastric plexus – arise from nerve roots S2 and S4 and carry all parasympathetic signals to the bladder, rectum, and the sigmoid and left colons. Lesions to these bundles are the main cause of neurogenic urinary retention.

The inferior hypogastric plexi split into the vesical, uterine, and rectal branches, which carry the sympathetic, parasympathetic, and sensory fibers from both the splanchnic and hypogastric nerves. Damage to the inferior hypogastric plexi and/or its branches may induce severe dysfunction to the target organs of the injured fibers.
 

A focus on the hypogastric nerve

Our approach was developed after we studied the anatomic reliability of the hypogastric nerves through a prospective observational study consisting of measurements during five cadaveric dissections and 10 in-vivo laparoscopic surgeries for rectosigmoid endometriosis.4 We took an interfascial approach to dissection.

Our goal was to clarify the distances between the hypogastric nerves and the ureters, the midsagittal plane, the midcervical plane, and the uterosacral ligaments in each hemipelvis, and in doing so, enable identification of the hypogastric nerves and establish recognizable limits for dissection.

We found quite a bit of variance in the anatomic position and appearance of the hypogastric nerves, but the variances were not very broad. Most notably, the right hypogastric nerve was significantly farther toward the ureter (mean, 14.5 mm; range, 10-25 mm) than the left one (mean, 8.6 mm; range, 7-12 mm).

The ureters were a good landmark for identification of the hypogastric nerves because the nerves were consistently found medially and posteriorly to the ureter at a mean distance of 11.6 mm. Overall, we demonstrated reproducibility in the identification and dissection of the hypogastric nerves using recognizable interfascial planes and anatomic landmarks.⁴

With good anatomic understanding, a stepwise approach can be taken to identify and preserve the hypogastric nerve and the deeper inferior hypogastric plexus without the need for more extensive dissection.

As shown in our 2019 video, the right hypogastric nerves can be identified transperitoneally in most cases.5 For confirmation, a gentle anterior pulling on the hypogastric nerve causes a caudal movement of the peritoneum overlying the superior hypogastric plexus. (Intermittent pulling on the nerve can also be helpful in localizing the left hypogastric nerve.)

To dissect a hypogastric nerve, the retroperitoneum is opened at the level of the pelvic brim, just inferomedially to the external iliac vessels, and the incision is extended anteriorly, with gentle dissection of the underlying tissue until the ureter is identified.

Once the ureter is identified and lateralized, dissection along the peritoneum is carried deeper and medially into the pelvis until the hypogastric nerve is identified. Lateral to this area are the internal iliac artery, the branching uterine artery, and the obliterated umbilical ligament. In the left hemipelvis, the hypogastric nerve can reliably be found at a mean distance of 8.6 mm from the ureter, while the right one will be found on average 14.5 mm away.

The hypogastric nerves form the posteromedial limit for a safe and simple nerve-sparing dissection. Any dissection posteriorly and laterally to these landmarks should start with the identification of sacral nerve roots and hypogastric nerves.

Dr. Lemos reported that he has no relevant disclosures.
 

Dr. Lemos is associate professor in the department of obstetrics and gynecology at the University of Toronto.

References

1. Imboden S et al. J Minim Invasive Gynecol. 2021 Aug;28(8):1544-51. doi: 10.1016/j.jmig.2021.01.009.

2. Possover M et al. J Am Coll Surg. 2005;201(6):913-7. doi: 10.1016/j.jamcollsurg.2005.07.006.

3. Ceccaroni M et al. Surg Endosc. 2012;26(7):2029-45. doi: 10.1007/s00464-012-2153-3.

4. Seracchioli R et al. J Minim Invasive Gynecol. 2019;26(7):1340-5. doi: 10.1016/j.jmig.2019.01.010.

5. Zakhari A et al. J Minim Invasive Gynecol. 2020;27(4):813-4. doi: 10.1016/j.jmig.2019.08.001

6. Lemos N et al. Fertil Steril. 2015 Nov;104(5):e11-2. doi: 10.1016/j.fertnstert.2015.07.1138. 

7. Possover M. Fertil Steril. 2014 Mar;101(3):754-8. doi: 10.1016/j.fertnstert.2013.12.019.

Radical resection of deep infiltrating endometriosis (DIE) or pelvic malignancies can lead to inadvertent damage to the pelvic autonomic nerve bundles, causing urinary dysfunction in up to 41% of cases, as well as anorectal and sexual dysfunction.¹ Each of these sequelae can significantly affect the patient’s quality of life.

Nerve-sparing techniques have therefore been a trending topic in gynecologic surgery in the 21st century, starting with papers by Marc Possover, MD, of Switzerland, on the laparoscopic neuronavigation (LANN) technique. In an important 2005 publication, he described how the LANN technique can significantly reduce postoperative functional morbidity in laparoscopic radical pelvic surgery.²

Lemos_Nucelio_TORONTO_web.jpg

The LANN method utilizes intraoperative neurostimulation to identify and dissect the intrapelvic nerve bundles away from surrounding tissue prior to dissection of the DIE or pelvic malignancies. The nerves are exposed and preserved under direct visualization in a fashion similar to that used to expose and preserve the ureters. Pelvic dissection using the LANN technique is extensive and occurs down to the level of the sacral nerve roots.

Dr. Possover’s 2005 paper and others like it spurred increased awareness of the intrapelvic part of the autonomic nervous system – in particular, the hypogastric nerves, the pelvic splanchnic nerves, and the inferior hypogastric plexus. Across additional published studies, nerve-sparing techniques were shown to be effective in preserving neurologic pelvic functions, with significantly less urinary retention and rectal/sexual dysfunction than seen with traditional laparoscopy techniques.

For example, in a single-center prospective clinical trial reported in 2012, 56 of 65 (86.2%) patients treated with a classical laparoscopic technique for excision of DIE reported neurologic pelvic dysfunctions, compared with 1 of 61 (1.6%) patients treated with a nerve-sparing approach.³

While research has confirmed the importance of nerve-sparing techniques, it also shone light on the reality that the LANN technique is extremely technically challenging and requires a high level of surgical expertise and advanced training. In my teaching of the technique, I also saw that few gynecologic surgeons were able to incorporate the advanced nerve-sparing technique into their practices.

A group consisting of myself and collaborators at the University of Bologna, Italy, and the University of Cambridge, England, recently developed an alternative to the LANN approach that uses the hypogastric nerves as landmarks. The technique requires less dissection and should be technically achievable when the pelvic neuroanatomy and anatomy of the presacral fascia are well understood. The hypogastric nerve is identified and used as a landmark to preserve the deeper autonomic nerve bundles in the pelvis without exposure and without more extensive dissection to the level of the sacral nerve roots.^4,5

This hypogastric nerve-based technique will cover the vast majority of radical surgeries for DIE. When more advanced nerve sparing and more extensive dissection is needed for the very deepest levels of disease infiltration, patients can be referred to surgeons with advanced training, comfort, and experience with the LANN technique.
 

The pelvic neuroanatomy

As described in our video articles published in 2015 in Fertility and Sterility⁶ and 2019 in the Journal of Minimally Invasive Gynecology,⁵ the left and right hypogastric nerves are the main sympathetic nerves of the autonomic nervous system in the pelvis. They originate from the superior hypogastric plexus and, at the level of the middle rectal vessels, they join the pelvic sacral splanchnic nerves to form the inferior hypogastric plexus. They are easily identifiable at their origin and are the most superficial and readily identifiable component of the inferior hypogastric plexus.

159156_Fig 1_web.jpg

The sympathetic input from the hypogastric nerves causes the internal urethral and anal sphincters to contract, as well as detrusor relaxation and a reduction of peristalsis of the descending colon, sigmoid, and rectum; thus, hypogastric nerve input promotes continence.

The hypogastric nerves also carry afferent signals for pelvic visceral proprioception. Lesion to the hypogastric nerves will usually be subclinical and will put the patient at risk for unnoticeable bladder distension, which usually becomes symptomatic about 7 years after the procedure.⁷

159156_Fig 2_web.JPG

The thin pelvic splanchnic nerves – which merge with the hypogastric nerves into the pararectal fossae to form the inferior hypogastric plexus – arise from nerve roots S2 and S4 and carry all parasympathetic signals to the bladder, rectum, and the sigmoid and left colons. Lesions to these bundles are the main cause of neurogenic urinary retention.

The inferior hypogastric plexi split into the vesical, uterine, and rectal branches, which carry the sympathetic, parasympathetic, and sensory fibers from both the splanchnic and hypogastric nerves. Damage to the inferior hypogastric plexi and/or its branches may induce severe dysfunction to the target organs of the injured fibers.
 

A focus on the hypogastric nerve

Our approach was developed after we studied the anatomic reliability of the hypogastric nerves through a prospective observational study consisting of measurements during five cadaveric dissections and 10 in-vivo laparoscopic surgeries for rectosigmoid endometriosis.4 We took an interfascial approach to dissection.

Our goal was to clarify the distances between the hypogastric nerves and the ureters, the midsagittal plane, the midcervical plane, and the uterosacral ligaments in each hemipelvis, and in doing so, enable identification of the hypogastric nerves and establish recognizable limits for dissection.

We found quite a bit of variance in the anatomic position and appearance of the hypogastric nerves, but the variances were not very broad. Most notably, the right hypogastric nerve was significantly farther toward the ureter (mean, 14.5 mm; range, 10-25 mm) than the left one (mean, 8.6 mm; range, 7-12 mm).

The ureters were a good landmark for identification of the hypogastric nerves because the nerves were consistently found medially and posteriorly to the ureter at a mean distance of 11.6 mm. Overall, we demonstrated reproducibility in the identification and dissection of the hypogastric nerves using recognizable interfascial planes and anatomic landmarks.⁴

With good anatomic understanding, a stepwise approach can be taken to identify and preserve the hypogastric nerve and the deeper inferior hypogastric plexus without the need for more extensive dissection.

As shown in our 2019 video, the right hypogastric nerves can be identified transperitoneally in most cases.5 For confirmation, a gentle anterior pulling on the hypogastric nerve causes a caudal movement of the peritoneum overlying the superior hypogastric plexus. (Intermittent pulling on the nerve can also be helpful in localizing the left hypogastric nerve.)

To dissect a hypogastric nerve, the retroperitoneum is opened at the level of the pelvic brim, just inferomedially to the external iliac vessels, and the incision is extended anteriorly, with gentle dissection of the underlying tissue until the ureter is identified.

Once the ureter is identified and lateralized, dissection along the peritoneum is carried deeper and medially into the pelvis until the hypogastric nerve is identified. Lateral to this area are the internal iliac artery, the branching uterine artery, and the obliterated umbilical ligament. In the left hemipelvis, the hypogastric nerve can reliably be found at a mean distance of 8.6 mm from the ureter, while the right one will be found on average 14.5 mm away.

The hypogastric nerves form the posteromedial limit for a safe and simple nerve-sparing dissection. Any dissection posteriorly and laterally to these landmarks should start with the identification of sacral nerve roots and hypogastric nerves.

Dr. Lemos reported that he has no relevant disclosures.
 

Dr. Lemos is associate professor in the department of obstetrics and gynecology at the University of Toronto.

References

1. Imboden S et al. J Minim Invasive Gynecol. 2021 Aug;28(8):1544-51. doi: 10.1016/j.jmig.2021.01.009.

2. Possover M et al. J Am Coll Surg. 2005;201(6):913-7. doi: 10.1016/j.jamcollsurg.2005.07.006.

3. Ceccaroni M et al. Surg Endosc. 2012;26(7):2029-45. doi: 10.1007/s00464-012-2153-3.

4. Seracchioli R et al. J Minim Invasive Gynecol. 2019;26(7):1340-5. doi: 10.1016/j.jmig.2019.01.010.

5. Zakhari A et al. J Minim Invasive Gynecol. 2020;27(4):813-4. doi: 10.1016/j.jmig.2019.08.001

6. Lemos N et al. Fertil Steril. 2015 Nov;104(5):e11-2. doi: 10.1016/j.fertnstert.2015.07.1138. 

7. Possover M. Fertil Steril. 2014 Mar;101(3):754-8. doi: 10.1016/j.fertnstert.2013.12.019.

Radical resection of deep infiltrating endometriosis (DIE) or pelvic malignancies can lead to inadvertent damage to the pelvic autonomic nerve bundles, causing urinary dysfunction in up to 41% of cases, as well as anorectal and sexual dysfunction.¹ Each of these sequelae can significantly affect the patient’s quality of life.

Nerve-sparing techniques have therefore been a trending topic in gynecologic surgery in the 21st century, starting with papers by Marc Possover, MD, of Switzerland, on the laparoscopic neuronavigation (LANN) technique. In an important 2005 publication, he described how the LANN technique can significantly reduce postoperative functional morbidity in laparoscopic radical pelvic surgery.²

Lemos_Nucelio_TORONTO_web.jpg

The LANN method utilizes intraoperative neurostimulation to identify and dissect the intrapelvic nerve bundles away from surrounding tissue prior to dissection of the DIE or pelvic malignancies. The nerves are exposed and preserved under direct visualization in a fashion similar to that used to expose and preserve the ureters. Pelvic dissection using the LANN technique is extensive and occurs down to the level of the sacral nerve roots.

Dr. Possover’s 2005 paper and others like it spurred increased awareness of the intrapelvic part of the autonomic nervous system – in particular, the hypogastric nerves, the pelvic splanchnic nerves, and the inferior hypogastric plexus. Across additional published studies, nerve-sparing techniques were shown to be effective in preserving neurologic pelvic functions, with significantly less urinary retention and rectal/sexual dysfunction than seen with traditional laparoscopy techniques.

For example, in a single-center prospective clinical trial reported in 2012, 56 of 65 (86.2%) patients treated with a classical laparoscopic technique for excision of DIE reported neurologic pelvic dysfunctions, compared with 1 of 61 (1.6%) patients treated with a nerve-sparing approach.³

While research has confirmed the importance of nerve-sparing techniques, it also shone light on the reality that the LANN technique is extremely technically challenging and requires a high level of surgical expertise and advanced training. In my teaching of the technique, I also saw that few gynecologic surgeons were able to incorporate the advanced nerve-sparing technique into their practices.

A group consisting of myself and collaborators at the University of Bologna, Italy, and the University of Cambridge, England, recently developed an alternative to the LANN approach that uses the hypogastric nerves as landmarks. The technique requires less dissection and should be technically achievable when the pelvic neuroanatomy and anatomy of the presacral fascia are well understood. The hypogastric nerve is identified and used as a landmark to preserve the deeper autonomic nerve bundles in the pelvis without exposure and without more extensive dissection to the level of the sacral nerve roots.^4,5

This hypogastric nerve-based technique will cover the vast majority of radical surgeries for DIE. When more advanced nerve sparing and more extensive dissection is needed for the very deepest levels of disease infiltration, patients can be referred to surgeons with advanced training, comfort, and experience with the LANN technique.
 

The pelvic neuroanatomy

As described in our video articles published in 2015 in Fertility and Sterility⁶ and 2019 in the Journal of Minimally Invasive Gynecology,⁵ the left and right hypogastric nerves are the main sympathetic nerves of the autonomic nervous system in the pelvis. They originate from the superior hypogastric plexus and, at the level of the middle rectal vessels, they join the pelvic sacral splanchnic nerves to form the inferior hypogastric plexus. They are easily identifiable at their origin and are the most superficial and readily identifiable component of the inferior hypogastric plexus.

159156_Fig 1_web.jpg

The sympathetic input from the hypogastric nerves causes the internal urethral and anal sphincters to contract, as well as detrusor relaxation and a reduction of peristalsis of the descending colon, sigmoid, and rectum; thus, hypogastric nerve input promotes continence.

The hypogastric nerves also carry afferent signals for pelvic visceral proprioception. Lesion to the hypogastric nerves will usually be subclinical and will put the patient at risk for unnoticeable bladder distension, which usually becomes symptomatic about 7 years after the procedure.⁷

159156_Fig 2_web.JPG

The thin pelvic splanchnic nerves – which merge with the hypogastric nerves into the pararectal fossae to form the inferior hypogastric plexus – arise from nerve roots S2 and S4 and carry all parasympathetic signals to the bladder, rectum, and the sigmoid and left colons. Lesions to these bundles are the main cause of neurogenic urinary retention.

The inferior hypogastric plexi split into the vesical, uterine, and rectal branches, which carry the sympathetic, parasympathetic, and sensory fibers from both the splanchnic and hypogastric nerves. Damage to the inferior hypogastric plexi and/or its branches may induce severe dysfunction to the target organs of the injured fibers.
 

A focus on the hypogastric nerve

Our approach was developed after we studied the anatomic reliability of the hypogastric nerves through a prospective observational study consisting of measurements during five cadaveric dissections and 10 in-vivo laparoscopic surgeries for rectosigmoid endometriosis.4 We took an interfascial approach to dissection.

Our goal was to clarify the distances between the hypogastric nerves and the ureters, the midsagittal plane, the midcervical plane, and the uterosacral ligaments in each hemipelvis, and in doing so, enable identification of the hypogastric nerves and establish recognizable limits for dissection.

We found quite a bit of variance in the anatomic position and appearance of the hypogastric nerves, but the variances were not very broad. Most notably, the right hypogastric nerve was significantly farther toward the ureter (mean, 14.5 mm; range, 10-25 mm) than the left one (mean, 8.6 mm; range, 7-12 mm).

The ureters were a good landmark for identification of the hypogastric nerves because the nerves were consistently found medially and posteriorly to the ureter at a mean distance of 11.6 mm. Overall, we demonstrated reproducibility in the identification and dissection of the hypogastric nerves using recognizable interfascial planes and anatomic landmarks.⁴

With good anatomic understanding, a stepwise approach can be taken to identify and preserve the hypogastric nerve and the deeper inferior hypogastric plexus without the need for more extensive dissection.

As shown in our 2019 video, the right hypogastric nerves can be identified transperitoneally in most cases.5 For confirmation, a gentle anterior pulling on the hypogastric nerve causes a caudal movement of the peritoneum overlying the superior hypogastric plexus. (Intermittent pulling on the nerve can also be helpful in localizing the left hypogastric nerve.)

To dissect a hypogastric nerve, the retroperitoneum is opened at the level of the pelvic brim, just inferomedially to the external iliac vessels, and the incision is extended anteriorly, with gentle dissection of the underlying tissue until the ureter is identified.

Once the ureter is identified and lateralized, dissection along the peritoneum is carried deeper and medially into the pelvis until the hypogastric nerve is identified. Lateral to this area are the internal iliac artery, the branching uterine artery, and the obliterated umbilical ligament. In the left hemipelvis, the hypogastric nerve can reliably be found at a mean distance of 8.6 mm from the ureter, while the right one will be found on average 14.5 mm away.

The hypogastric nerves form the posteromedial limit for a safe and simple nerve-sparing dissection. Any dissection posteriorly and laterally to these landmarks should start with the identification of sacral nerve roots and hypogastric nerves.

Dr. Lemos reported that he has no relevant disclosures.
 

Dr. Lemos is associate professor in the department of obstetrics and gynecology at the University of Toronto.

References

1. Imboden S et al. J Minim Invasive Gynecol. 2021 Aug;28(8):1544-51. doi: 10.1016/j.jmig.2021.01.009.

2. Possover M et al. J Am Coll Surg. 2005;201(6):913-7. doi: 10.1016/j.jamcollsurg.2005.07.006.

3. Ceccaroni M et al. Surg Endosc. 2012;26(7):2029-45. doi: 10.1007/s00464-012-2153-3.

4. Seracchioli R et al. J Minim Invasive Gynecol. 2019;26(7):1340-5. doi: 10.1016/j.jmig.2019.01.010.

5. Zakhari A et al. J Minim Invasive Gynecol. 2020;27(4):813-4. doi: 10.1016/j.jmig.2019.08.001

6. Lemos N et al. Fertil Steril. 2015 Nov;104(5):e11-2. doi: 10.1016/j.fertnstert.2015.07.1138. 

7. Possover M. Fertil Steril. 2014 Mar;101(3):754-8. doi: 10.1016/j.fertnstert.2013.12.019.

The pelvic autonomic nerves are responsible for the neurogenic control of the rectum and bladder and for sexual arousal. Over the past 30 years, different nerve-sparing techniques have been recommended and adopted to minimize risk of urinary or rectal dysfunction and incontinence, as well as sexual dysfunction, in radical surgery for rectal and early cervical cancer without compromising surgical outcome.

As the treatment of deep infiltrative endometriosis has become more aggressive and radical, it is certainly feasible to consider nerve-sparing techniques at the time of dissection and endometriosis excision to minimize the known risk of urinary, rectal, and sexual dysfunction. Interestingly, because endometriosis generally follows an asymmetric distribution, effect on bladder function is not as problematic as it is in the case of cancer surgery.

Miller_Charles_E 2014_web.jpg

Early innovators include Dr. Marc Possover from Switzerland and Dr. Marcello Ceccaroni from Italy. Both physicians are superior pelvic neuroanatomists. Both describe meticulous and extensive dissection of the nerves of the pelvis at the time of excision of deep infiltrative endometriosis. Unfortunately, their techniques would appear to be beyond the scope of even the most experienced excisional surgeons.

A simplified approach to nerve sparing at the time of excision of deep infiltrative endometriosis has been developed by our guest author, Dr. Nucelio Lemos, in collaboration with physicians at the University of Bologna and the University of Cambridge. By using the hypogastric nerves as the landmark, they have developed a more surgeon friendly and less radical approach to nerve sparing at the time of deep infiltrative endometriosis surgery.

For this edition of the Master Class in Gynecologic Surgery, I have enlisted the assistance of both Dr. Lemos and his fellow in advanced gynecologic surgery, Dr. Meghan McGrattan, from Mount Sinai and Women’s College Hospital in Toronto. Dr. McGrattan drew the anatomic illustrations that accompany Dr. Lemos’ description of the new technique.

Dr. Lemos is associate professor in the department of obstetrics and gynecology at the University of Toronto. He specializes in pelvic pain, pelvic floor dysfunction, pelvic organ prolapse, endometriosis, and neuropelveology. Dr. Lemos is a founding member and second vice president of the International Society of Neuropelveology. In addition, Dr. Lemos started the Pelvic Functional Surgery and Neuropelveology Clinic in the department of obstetrics and gynecology of Mount Sinai and Women’s College Hospitals, Toronto.

It is a pleasure and honor to welcome Dr. Lemos and Dr. McGrattan to this addition of the Master Class in Gynecologic Surgery.
 

Dr. Miller is a professor of obstetrics and gynecology, department of clinical sciences, Rosalind Franklin University of Medicine and Science, North Chicago, Ill. He has no conflicts of interest to report.

The pelvic autonomic nerves are responsible for the neurogenic control of the rectum and bladder and for sexual arousal. Over the past 30 years, different nerve-sparing techniques have been recommended and adopted to minimize risk of urinary or rectal dysfunction and incontinence, as well as sexual dysfunction, in radical surgery for rectal and early cervical cancer without compromising surgical outcome.

As the treatment of deep infiltrative endometriosis has become more aggressive and radical, it is certainly feasible to consider nerve-sparing techniques at the time of dissection and endometriosis excision to minimize the known risk of urinary, rectal, and sexual dysfunction. Interestingly, because endometriosis generally follows an asymmetric distribution, effect on bladder function is not as problematic as it is in the case of cancer surgery.

Miller_Charles_E 2014_web.jpg

Early innovators include Dr. Marc Possover from Switzerland and Dr. Marcello Ceccaroni from Italy. Both physicians are superior pelvic neuroanatomists. Both describe meticulous and extensive dissection of the nerves of the pelvis at the time of excision of deep infiltrative endometriosis. Unfortunately, their techniques would appear to be beyond the scope of even the most experienced excisional surgeons.

A simplified approach to nerve sparing at the time of excision of deep infiltrative endometriosis has been developed by our guest author, Dr. Nucelio Lemos, in collaboration with physicians at the University of Bologna and the University of Cambridge. By using the hypogastric nerves as the landmark, they have developed a more surgeon friendly and less radical approach to nerve sparing at the time of deep infiltrative endometriosis surgery.

For this edition of the Master Class in Gynecologic Surgery, I have enlisted the assistance of both Dr. Lemos and his fellow in advanced gynecologic surgery, Dr. Meghan McGrattan, from Mount Sinai and Women’s College Hospital in Toronto. Dr. McGrattan drew the anatomic illustrations that accompany Dr. Lemos’ description of the new technique.

Dr. Lemos is associate professor in the department of obstetrics and gynecology at the University of Toronto. He specializes in pelvic pain, pelvic floor dysfunction, pelvic organ prolapse, endometriosis, and neuropelveology. Dr. Lemos is a founding member and second vice president of the International Society of Neuropelveology. In addition, Dr. Lemos started the Pelvic Functional Surgery and Neuropelveology Clinic in the department of obstetrics and gynecology of Mount Sinai and Women’s College Hospitals, Toronto.

It is a pleasure and honor to welcome Dr. Lemos and Dr. McGrattan to this addition of the Master Class in Gynecologic Surgery.
 

Dr. Miller is a professor of obstetrics and gynecology, department of clinical sciences, Rosalind Franklin University of Medicine and Science, North Chicago, Ill. He has no conflicts of interest to report.

The pelvic autonomic nerves are responsible for the neurogenic control of the rectum and bladder and for sexual arousal. Over the past 30 years, different nerve-sparing techniques have been recommended and adopted to minimize risk of urinary or rectal dysfunction and incontinence, as well as sexual dysfunction, in radical surgery for rectal and early cervical cancer without compromising surgical outcome.

As the treatment of deep infiltrative endometriosis has become more aggressive and radical, it is certainly feasible to consider nerve-sparing techniques at the time of dissection and endometriosis excision to minimize the known risk of urinary, rectal, and sexual dysfunction. Interestingly, because endometriosis generally follows an asymmetric distribution, effect on bladder function is not as problematic as it is in the case of cancer surgery.

Miller_Charles_E 2014_web.jpg

Early innovators include Dr. Marc Possover from Switzerland and Dr. Marcello Ceccaroni from Italy. Both physicians are superior pelvic neuroanatomists. Both describe meticulous and extensive dissection of the nerves of the pelvis at the time of excision of deep infiltrative endometriosis. Unfortunately, their techniques would appear to be beyond the scope of even the most experienced excisional surgeons.

A simplified approach to nerve sparing at the time of excision of deep infiltrative endometriosis has been developed by our guest author, Dr. Nucelio Lemos, in collaboration with physicians at the University of Bologna and the University of Cambridge. By using the hypogastric nerves as the landmark, they have developed a more surgeon friendly and less radical approach to nerve sparing at the time of deep infiltrative endometriosis surgery.

For this edition of the Master Class in Gynecologic Surgery, I have enlisted the assistance of both Dr. Lemos and his fellow in advanced gynecologic surgery, Dr. Meghan McGrattan, from Mount Sinai and Women’s College Hospital in Toronto. Dr. McGrattan drew the anatomic illustrations that accompany Dr. Lemos’ description of the new technique.

Dr. Lemos is associate professor in the department of obstetrics and gynecology at the University of Toronto. He specializes in pelvic pain, pelvic floor dysfunction, pelvic organ prolapse, endometriosis, and neuropelveology. Dr. Lemos is a founding member and second vice president of the International Society of Neuropelveology. In addition, Dr. Lemos started the Pelvic Functional Surgery and Neuropelveology Clinic in the department of obstetrics and gynecology of Mount Sinai and Women’s College Hospitals, Toronto.

It is a pleasure and honor to welcome Dr. Lemos and Dr. McGrattan to this addition of the Master Class in Gynecologic Surgery.
 

Dr. Miller is a professor of obstetrics and gynecology, department of clinical sciences, Rosalind Franklin University of Medicine and Science, North Chicago, Ill. He has no conflicts of interest to report.

Women who’ve had endometriosis carry an elevated risk of stroke with them for the rest of their lives, with the greatest risk found in women who’ve had a hysterectomy with an oophorectomy, according to a cohort study of the Nurses’ Health Study.

“This is yet additional evidence that those girls and women with endometriosis are having effects across their lives and in multiple aspects of their health and well-being,” senior study author Stacey A. Missmer, ScD, of the Michigan State University, East Lansing, said in an interview. “This is not, in quotes ‘just a gynecologic condition,’ ” Dr. Missmer added. “It is not strictly about the pelvic pain or infertility, but it really is about the whole health across the life course.”

Missmer_Stacey_MICH_web.jpg

The study included 112,056 women in the NHSII cohort study who were followed from 1989 to June 2017, documenting 893 incident cases of stroke among them – an incidence of less than 1%. Endometriosis was reported in 5,244 women, and 93% of the cohort were White.

Multivariate adjusted models showed that women who had laparoscopically confirmed endometriosis had a 34% greater risk of stroke than women without a history of endometriosis. Leslie V. Farland, ScD, of the University of Arizona, Tucson, was lead author of the study.

While previous studies have demonstrated an increased risk of cardiovascular disease, heart attack, angina, and atherosclerosis in women who’ve had endometriosis, this is the first study that has confirmed an additional increased risk of stroke, Dr. Missmer said.

Another novel finding, Dr. Missmer said, is that while the CVD risks for these women “seem to peak at an earlier age,” the study found no age differences for stroke risk. “That also reinforces that these stroke events are often happening in an age range typical for stroke, which is further removed from when women are thinking about their gynecologic health specifically.”

These findings don’t translate into a significantly greater risk for stroke overall in women who’ve had endometriosis, Dr. Missmer said. She characterized the risk as “not negligible, but it’s not a huge increased risk.” The absolute risk is still fairly low, she said.

“We don’t want to give the impression that all women with endometriosis need to be panicked or fearful about stroke, she said. “Rather, the messaging is that this yet another bit of evidence that whole health care for those with endometriosis is important.”

Women who’ve had endometriosis and their primary care providers need to be attuned to stroke risk, she said. “This is a critical condition that primary care physicians need to engage around, and perhaps if symptoms related to cardiovascular and cerebrovascular disease emerge in their patients, they need to be engaging cardiology and similar types of support. This is not just about the gynecologists.”

The study also explored other factors that may contribute to stroke risk, with the most significant being hysterectomy with bilateral oophorectomy, Dr. Missmer said.

McCullough_Louise_TEX_web.jpg

This study was unique because it used laparoscopically confirmed rather than self-reported endometriosis, said Louise D. McCullough, MD, neurology chair at the University of Texas Health Science Center, Houston. Another strength of the study she noted was its longitudinal design, although the cohort study design yielded a low number of stroke patients.

“Regardless, I do think it was a very important study because we have a growing recognition about how women’s health and factors such as pregnancy, infertility, parity, complications, and gonadal hormones such as estrogen can influence a woman’s stroke risk much later in life,” Dr. McCullough said in an interview.

Future studies into the relationship between endometriosis and CVD and stroke risk should focus on the mechanism behind the inflammation that occurs in endometriosis, Dr. McCullough said. “Part of it is probably the loss of hormones if a patient has to have an oophorectomy, but part of it is just what do these diseases do for a woman’s later risk – and for primary care physicians, ob.gyns., and stroke neurologists to recognize that these are questions we should ask: Have you ever  had eclampsia or preeclampsia? Did you have endometriosis? Have you had miscarriages?”

The study received funding from the Eunice Kennedy Shriver National Institute of Child Health and Human Development and the National Institute for Neurological Disorders and Stroke. Dr. Missmer disclosed relationships with Shanghai Huilun Biotechnology, Roche, and AbbVie. Dr. McCullough has no relevant disclosures.


 

Women who’ve had endometriosis carry an elevated risk of stroke with them for the rest of their lives, with the greatest risk found in women who’ve had a hysterectomy with an oophorectomy, according to a cohort study of the Nurses’ Health Study.

“This is yet additional evidence that those girls and women with endometriosis are having effects across their lives and in multiple aspects of their health and well-being,” senior study author Stacey A. Missmer, ScD, of the Michigan State University, East Lansing, said in an interview. “This is not, in quotes ‘just a gynecologic condition,’ ” Dr. Missmer added. “It is not strictly about the pelvic pain or infertility, but it really is about the whole health across the life course.”

Missmer_Stacey_MICH_web.jpg

The study included 112,056 women in the NHSII cohort study who were followed from 1989 to June 2017, documenting 893 incident cases of stroke among them – an incidence of less than 1%. Endometriosis was reported in 5,244 women, and 93% of the cohort were White.

Multivariate adjusted models showed that women who had laparoscopically confirmed endometriosis had a 34% greater risk of stroke than women without a history of endometriosis. Leslie V. Farland, ScD, of the University of Arizona, Tucson, was lead author of the study.

While previous studies have demonstrated an increased risk of cardiovascular disease, heart attack, angina, and atherosclerosis in women who’ve had endometriosis, this is the first study that has confirmed an additional increased risk of stroke, Dr. Missmer said.

Another novel finding, Dr. Missmer said, is that while the CVD risks for these women “seem to peak at an earlier age,” the study found no age differences for stroke risk. “That also reinforces that these stroke events are often happening in an age range typical for stroke, which is further removed from when women are thinking about their gynecologic health specifically.”

These findings don’t translate into a significantly greater risk for stroke overall in women who’ve had endometriosis, Dr. Missmer said. She characterized the risk as “not negligible, but it’s not a huge increased risk.” The absolute risk is still fairly low, she said.

“We don’t want to give the impression that all women with endometriosis need to be panicked or fearful about stroke, she said. “Rather, the messaging is that this yet another bit of evidence that whole health care for those with endometriosis is important.”

Women who’ve had endometriosis and their primary care providers need to be attuned to stroke risk, she said. “This is a critical condition that primary care physicians need to engage around, and perhaps if symptoms related to cardiovascular and cerebrovascular disease emerge in their patients, they need to be engaging cardiology and similar types of support. This is not just about the gynecologists.”

The study also explored other factors that may contribute to stroke risk, with the most significant being hysterectomy with bilateral oophorectomy, Dr. Missmer said.

McCullough_Louise_TEX_web.jpg

This study was unique because it used laparoscopically confirmed rather than self-reported endometriosis, said Louise D. McCullough, MD, neurology chair at the University of Texas Health Science Center, Houston. Another strength of the study she noted was its longitudinal design, although the cohort study design yielded a low number of stroke patients.

“Regardless, I do think it was a very important study because we have a growing recognition about how women’s health and factors such as pregnancy, infertility, parity, complications, and gonadal hormones such as estrogen can influence a woman’s stroke risk much later in life,” Dr. McCullough said in an interview.

Future studies into the relationship between endometriosis and CVD and stroke risk should focus on the mechanism behind the inflammation that occurs in endometriosis, Dr. McCullough said. “Part of it is probably the loss of hormones if a patient has to have an oophorectomy, but part of it is just what do these diseases do for a woman’s later risk – and for primary care physicians, ob.gyns., and stroke neurologists to recognize that these are questions we should ask: Have you ever  had eclampsia or preeclampsia? Did you have endometriosis? Have you had miscarriages?”

The study received funding from the Eunice Kennedy Shriver National Institute of Child Health and Human Development and the National Institute for Neurological Disorders and Stroke. Dr. Missmer disclosed relationships with Shanghai Huilun Biotechnology, Roche, and AbbVie. Dr. McCullough has no relevant disclosures.


 

Women who’ve had endometriosis carry an elevated risk of stroke with them for the rest of their lives, with the greatest risk found in women who’ve had a hysterectomy with an oophorectomy, according to a cohort study of the Nurses’ Health Study.

“This is yet additional evidence that those girls and women with endometriosis are having effects across their lives and in multiple aspects of their health and well-being,” senior study author Stacey A. Missmer, ScD, of the Michigan State University, East Lansing, said in an interview. “This is not, in quotes ‘just a gynecologic condition,’ ” Dr. Missmer added. “It is not strictly about the pelvic pain or infertility, but it really is about the whole health across the life course.”

Missmer_Stacey_MICH_web.jpg

The study included 112,056 women in the NHSII cohort study who were followed from 1989 to June 2017, documenting 893 incident cases of stroke among them – an incidence of less than 1%. Endometriosis was reported in 5,244 women, and 93% of the cohort were White.

Multivariate adjusted models showed that women who had laparoscopically confirmed endometriosis had a 34% greater risk of stroke than women without a history of endometriosis. Leslie V. Farland, ScD, of the University of Arizona, Tucson, was lead author of the study.

While previous studies have demonstrated an increased risk of cardiovascular disease, heart attack, angina, and atherosclerosis in women who’ve had endometriosis, this is the first study that has confirmed an additional increased risk of stroke, Dr. Missmer said.

Another novel finding, Dr. Missmer said, is that while the CVD risks for these women “seem to peak at an earlier age,” the study found no age differences for stroke risk. “That also reinforces that these stroke events are often happening in an age range typical for stroke, which is further removed from when women are thinking about their gynecologic health specifically.”

These findings don’t translate into a significantly greater risk for stroke overall in women who’ve had endometriosis, Dr. Missmer said. She characterized the risk as “not negligible, but it’s not a huge increased risk.” The absolute risk is still fairly low, she said.

“We don’t want to give the impression that all women with endometriosis need to be panicked or fearful about stroke, she said. “Rather, the messaging is that this yet another bit of evidence that whole health care for those with endometriosis is important.”

Women who’ve had endometriosis and their primary care providers need to be attuned to stroke risk, she said. “This is a critical condition that primary care physicians need to engage around, and perhaps if symptoms related to cardiovascular and cerebrovascular disease emerge in their patients, they need to be engaging cardiology and similar types of support. This is not just about the gynecologists.”

The study also explored other factors that may contribute to stroke risk, with the most significant being hysterectomy with bilateral oophorectomy, Dr. Missmer said.

McCullough_Louise_TEX_web.jpg

This study was unique because it used laparoscopically confirmed rather than self-reported endometriosis, said Louise D. McCullough, MD, neurology chair at the University of Texas Health Science Center, Houston. Another strength of the study she noted was its longitudinal design, although the cohort study design yielded a low number of stroke patients.

“Regardless, I do think it was a very important study because we have a growing recognition about how women’s health and factors such as pregnancy, infertility, parity, complications, and gonadal hormones such as estrogen can influence a woman’s stroke risk much later in life,” Dr. McCullough said in an interview.

Future studies into the relationship between endometriosis and CVD and stroke risk should focus on the mechanism behind the inflammation that occurs in endometriosis, Dr. McCullough said. “Part of it is probably the loss of hormones if a patient has to have an oophorectomy, but part of it is just what do these diseases do for a woman’s later risk – and for primary care physicians, ob.gyns., and stroke neurologists to recognize that these are questions we should ask: Have you ever  had eclampsia or preeclampsia? Did you have endometriosis? Have you had miscarriages?”

The study received funding from the Eunice Kennedy Shriver National Institute of Child Health and Human Development and the National Institute for Neurological Disorders and Stroke. Dr. Missmer disclosed relationships with Shanghai Huilun Biotechnology, Roche, and AbbVie. Dr. McCullough has no relevant disclosures.


 

A new imaging study hopes to make diagnosing endometriosis quicker, more accurate and reduce the need for invasive surgery.

In October 2020 the All Party Parliamentary Group on Endometriosis published a report that included within its recommendations “a commitment to drive down diagnosis times” for women with the condition. On average, it takes around 8 years for a woman to get a diagnosis of endometriosis, a figure, said the authors of the report, that had “not improved in the last decade.”

Indeed, in its report the APPG said that it was seeking a commitment from Governments in all four nations to reduce average diagnosis times with “targets of 4 years or less by 2025, and a year or less by 2030.”
 

Surgery often needed for endometriosis diagnosis

Endometriosis affects 1 in 10 women between puberty and menopause – 1.5 million in the United Kingdom – often results in multiple general practitioner and accident and emergency department visits, multiple scans, and often laparoscopic surgery to confirm the diagnosis, as there is currently no simple diagnostic test for the condition. One of the main reasons for the delay in diagnosis is the lack of noninvasive tests capable of detecting all endometriosis subtypes – ovarian, superficial, and deep disease.

Now, experts at the Endometriosis CaRe Centre and Nuffield Department of Women’s and Reproductive Health, University of Oxford (England), in collaboration with British life sciences company Serac Healthcare, hope to establish a faster process for diagnosing endometriosis.

Christian Becker, codirector of the Endometriosis CaRe Centre in Oxford, and a study lead, said: “There is an urgent unmet clinical need for a noninvasive marker to identify or rule out endometriosis as it is such a very common disease affecting more than 190 million women worldwide.”

In the study, researchers will investigate whether a 20-minute imaging scan can detect the most common types of endometriosis, which currently require surgery to diagnose. In turn, they hope that earlier diagnosis of the condition will allow women to seek appropriate treatment sooner. They will use an experimental imaging marker – ^99mTc-maraciclatide – that binds to areas of inflammation and that can be used in endometriosis to visualize the disease on a scan. The imaging marker has already been used for detecting inflammation in conditions such as rheumatoid arthritis.

Between 2 and 7 days before planned surgery for suspected endometriosis, participants will be invited for an imaging scan, and the team will compare the suspected locations of disease detected on the scan with those seen during surgery to confirm whether this imaging test could be an effective noninvasive method of detecting all endometriosis subtypes.
 

Doctor visits and repeated investigations reduced

The researchers commented that the potential strengths of the scan lie in the way the imaging marker binds to areas of inflammation, which may allow doctors to distinguish between new and old lesions and detect endometriosis in areas not easily seen during surgery, such as the lung.

They added that the development of a 20-minute imaging test would reduce the need for repeated visits to doctors, for repeated investigations, and for invasive surgery to obtain a diagnosis. This would ultimately “reduce the time taken to confirm or exclude endometriosis,” they pointed out.

Following the publication of the APPG report in October 2020 the group’s then chair, the late Sir David Amess, said: “Without investment in research, a reduction in diagnosis time, and appropriate NHS pathways, those with endometriosis will continue to face huge barriers in accessing the appropriate support at the right time.”

Krina Zondervan, head of department at the Nuffield Department of Women’s and Reproductive Health, University of Oxford, and a study lead, said: “This study highlights that close collaborations between academics, clinicians and industry are important to combine and accelerate discovery and innovation in addressing high-priority areas in women’s health such as endometriosis.”

David Hail, CEO of Serac Healthcare, said: “We are excited about the potential of ^99mTc-maraciclatide to diagnose endometriosis noninvasively and delighted to be working with the internationally renowned team at Oxford on this important first study.”

A version of this article first appeared on Medscape UK.

A new imaging study hopes to make diagnosing endometriosis quicker, more accurate and reduce the need for invasive surgery.

In October 2020 the All Party Parliamentary Group on Endometriosis published a report that included within its recommendations “a commitment to drive down diagnosis times” for women with the condition. On average, it takes around 8 years for a woman to get a diagnosis of endometriosis, a figure, said the authors of the report, that had “not improved in the last decade.”

Indeed, in its report the APPG said that it was seeking a commitment from Governments in all four nations to reduce average diagnosis times with “targets of 4 years or less by 2025, and a year or less by 2030.”
 

Surgery often needed for endometriosis diagnosis

Endometriosis affects 1 in 10 women between puberty and menopause – 1.5 million in the United Kingdom – often results in multiple general practitioner and accident and emergency department visits, multiple scans, and often laparoscopic surgery to confirm the diagnosis, as there is currently no simple diagnostic test for the condition. One of the main reasons for the delay in diagnosis is the lack of noninvasive tests capable of detecting all endometriosis subtypes – ovarian, superficial, and deep disease.

Now, experts at the Endometriosis CaRe Centre and Nuffield Department of Women’s and Reproductive Health, University of Oxford (England), in collaboration with British life sciences company Serac Healthcare, hope to establish a faster process for diagnosing endometriosis.

Christian Becker, codirector of the Endometriosis CaRe Centre in Oxford, and a study lead, said: “There is an urgent unmet clinical need for a noninvasive marker to identify or rule out endometriosis as it is such a very common disease affecting more than 190 million women worldwide.”

In the study, researchers will investigate whether a 20-minute imaging scan can detect the most common types of endometriosis, which currently require surgery to diagnose. In turn, they hope that earlier diagnosis of the condition will allow women to seek appropriate treatment sooner. They will use an experimental imaging marker – ^99mTc-maraciclatide – that binds to areas of inflammation and that can be used in endometriosis to visualize the disease on a scan. The imaging marker has already been used for detecting inflammation in conditions such as rheumatoid arthritis.

Between 2 and 7 days before planned surgery for suspected endometriosis, participants will be invited for an imaging scan, and the team will compare the suspected locations of disease detected on the scan with those seen during surgery to confirm whether this imaging test could be an effective noninvasive method of detecting all endometriosis subtypes.
 

Doctor visits and repeated investigations reduced

The researchers commented that the potential strengths of the scan lie in the way the imaging marker binds to areas of inflammation, which may allow doctors to distinguish between new and old lesions and detect endometriosis in areas not easily seen during surgery, such as the lung.

They added that the development of a 20-minute imaging test would reduce the need for repeated visits to doctors, for repeated investigations, and for invasive surgery to obtain a diagnosis. This would ultimately “reduce the time taken to confirm or exclude endometriosis,” they pointed out.

Following the publication of the APPG report in October 2020 the group’s then chair, the late Sir David Amess, said: “Without investment in research, a reduction in diagnosis time, and appropriate NHS pathways, those with endometriosis will continue to face huge barriers in accessing the appropriate support at the right time.”

Krina Zondervan, head of department at the Nuffield Department of Women’s and Reproductive Health, University of Oxford, and a study lead, said: “This study highlights that close collaborations between academics, clinicians and industry are important to combine and accelerate discovery and innovation in addressing high-priority areas in women’s health such as endometriosis.”

David Hail, CEO of Serac Healthcare, said: “We are excited about the potential of ^99mTc-maraciclatide to diagnose endometriosis noninvasively and delighted to be working with the internationally renowned team at Oxford on this important first study.”

A version of this article first appeared on Medscape UK.

A new imaging study hopes to make diagnosing endometriosis quicker, more accurate and reduce the need for invasive surgery.

In October 2020 the All Party Parliamentary Group on Endometriosis published a report that included within its recommendations “a commitment to drive down diagnosis times” for women with the condition. On average, it takes around 8 years for a woman to get a diagnosis of endometriosis, a figure, said the authors of the report, that had “not improved in the last decade.”

Indeed, in its report the APPG said that it was seeking a commitment from Governments in all four nations to reduce average diagnosis times with “targets of 4 years or less by 2025, and a year or less by 2030.”
 

Surgery often needed for endometriosis diagnosis

Endometriosis affects 1 in 10 women between puberty and menopause – 1.5 million in the United Kingdom – often results in multiple general practitioner and accident and emergency department visits, multiple scans, and often laparoscopic surgery to confirm the diagnosis, as there is currently no simple diagnostic test for the condition. One of the main reasons for the delay in diagnosis is the lack of noninvasive tests capable of detecting all endometriosis subtypes – ovarian, superficial, and deep disease.

Now, experts at the Endometriosis CaRe Centre and Nuffield Department of Women’s and Reproductive Health, University of Oxford (England), in collaboration with British life sciences company Serac Healthcare, hope to establish a faster process for diagnosing endometriosis.

Christian Becker, codirector of the Endometriosis CaRe Centre in Oxford, and a study lead, said: “There is an urgent unmet clinical need for a noninvasive marker to identify or rule out endometriosis as it is such a very common disease affecting more than 190 million women worldwide.”

In the study, researchers will investigate whether a 20-minute imaging scan can detect the most common types of endometriosis, which currently require surgery to diagnose. In turn, they hope that earlier diagnosis of the condition will allow women to seek appropriate treatment sooner. They will use an experimental imaging marker – ^99mTc-maraciclatide – that binds to areas of inflammation and that can be used in endometriosis to visualize the disease on a scan. The imaging marker has already been used for detecting inflammation in conditions such as rheumatoid arthritis.

Between 2 and 7 days before planned surgery for suspected endometriosis, participants will be invited for an imaging scan, and the team will compare the suspected locations of disease detected on the scan with those seen during surgery to confirm whether this imaging test could be an effective noninvasive method of detecting all endometriosis subtypes.
 

Doctor visits and repeated investigations reduced

The researchers commented that the potential strengths of the scan lie in the way the imaging marker binds to areas of inflammation, which may allow doctors to distinguish between new and old lesions and detect endometriosis in areas not easily seen during surgery, such as the lung.

They added that the development of a 20-minute imaging test would reduce the need for repeated visits to doctors, for repeated investigations, and for invasive surgery to obtain a diagnosis. This would ultimately “reduce the time taken to confirm or exclude endometriosis,” they pointed out.

Following the publication of the APPG report in October 2020 the group’s then chair, the late Sir David Amess, said: “Without investment in research, a reduction in diagnosis time, and appropriate NHS pathways, those with endometriosis will continue to face huge barriers in accessing the appropriate support at the right time.”

Krina Zondervan, head of department at the Nuffield Department of Women’s and Reproductive Health, University of Oxford, and a study lead, said: “This study highlights that close collaborations between academics, clinicians and industry are important to combine and accelerate discovery and innovation in addressing high-priority areas in women’s health such as endometriosis.”

David Hail, CEO of Serac Healthcare, said: “We are excited about the potential of ^99mTc-maraciclatide to diagnose endometriosis noninvasively and delighted to be working with the internationally renowned team at Oxford on this important first study.”

A version of this article first appeared on Medscape UK.

A French research team has developed a microRNA (miRNA) signature for diagnosing endometriosis through a simple saliva test. Its validation in a larger cohort could soon allow doctors to have a cheap, noninvasive, and accurate tool to use in diagnosing a disease that, for the time being, is difficult to identify with any certainty. The researchers suggest that their methodology could be used as a blueprint to investigate other pathologies, both benign and malignant.

ENDO-miRNA study

miRNAs regulate as much as 60% of gene expression at the posttranscriptional level. In the setting of endometriosis, several authors have evaluated the relevance of a blood-based miRNA signature, but the results are discordant because of methodological and control group issues. Other researchers have also sought to develop a miRNA saliva test. A French team wanted to determine whether it was possible to define a saliva-based diagnostic miRNome signature that would allow patients with and without endometriosis to be differentiated and, from there, develop the first specific diagnostic test for the disease.

The prospective ENDO-miRNA study included saliva samples obtained from women with chronic pelvic pain suggestive of endometriosis. Exploratory procedures were performed to look for lesions. All the patients underwent either a laparoscopic procedure (therapeutic or diagnostic laparoscopy) and/or MRI imaging. For the patients who underwent laparoscopy, diagnosis was confirmed by histology. For the patients diagnosed with endometriosis without laparoscopic evaluation, all had MRI imaging with features of deep endometriosis.

One part of the study involved the identification of a biomarker based on genomewide miRNA expression profiling by small RNA sequencing using next-generation sequencing. The second part involved the development of a saliva-based miRNA diagnostic signature according to expression and accuracy profiling using a random forest algorithm.
 

High sensitivity, specificity

Among the 200 patients (mean age, 31 years) enrolled in the study, 76.5% (n = 153) were diagnosed with endometriosis. On average, their pain was statistically more severe than that of the women in the control group. The Visual Analogue Scale (VAS) scores were, respectively: dysmenorrhea 6 versus 5.0 (P < .001), dyspareunia 5.28 versus 4.95 (P < .001), and urinary pain during menstruation 4.35 versus 2.84 (P < .001).

Next-generation sequencing identified an average of 2,561 expressed miRNAs in the saliva samples. The feature selection method generated a subset of 109 miRNAs composing the endometriosis diagnostic signature. Among those miRNAs, 29 were associated with the main signaling pathways of endometriosis: PI3K/AKT, PTEN, Wnt/beta-catenin, HIF1-alpha/NF kappa B, and YAP/TAZ/EGFR.

The accuracy and reproducibility of the signature were tested on several data sets randomly composed of the same proportion of controls and patients with endometriosis. The respective sensitivity, specificity, and area under the curve for the diagnostic miRNA signature were 96.7%, 100%, and 98.3%, respectively.

The study’s results support the use of a saliva-based miRNA signature for diagnosing whether a patient is discordant/complex (chronic pelvic pain suggestive of endometriosis and both negative clinical examination and imaging findings) or has early-stage or advanced-stage endometriosis.

A version of this article first appeared on Medscape.com.

A French research team has developed a microRNA (miRNA) signature for diagnosing endometriosis through a simple saliva test. Its validation in a larger cohort could soon allow doctors to have a cheap, noninvasive, and accurate tool to use in diagnosing a disease that, for the time being, is difficult to identify with any certainty. The researchers suggest that their methodology could be used as a blueprint to investigate other pathologies, both benign and malignant.

ENDO-miRNA study

miRNAs regulate as much as 60% of gene expression at the posttranscriptional level. In the setting of endometriosis, several authors have evaluated the relevance of a blood-based miRNA signature, but the results are discordant because of methodological and control group issues. Other researchers have also sought to develop a miRNA saliva test. A French team wanted to determine whether it was possible to define a saliva-based diagnostic miRNome signature that would allow patients with and without endometriosis to be differentiated and, from there, develop the first specific diagnostic test for the disease.

The prospective ENDO-miRNA study included saliva samples obtained from women with chronic pelvic pain suggestive of endometriosis. Exploratory procedures were performed to look for lesions. All the patients underwent either a laparoscopic procedure (therapeutic or diagnostic laparoscopy) and/or MRI imaging. For the patients who underwent laparoscopy, diagnosis was confirmed by histology. For the patients diagnosed with endometriosis without laparoscopic evaluation, all had MRI imaging with features of deep endometriosis.

One part of the study involved the identification of a biomarker based on genomewide miRNA expression profiling by small RNA sequencing using next-generation sequencing. The second part involved the development of a saliva-based miRNA diagnostic signature according to expression and accuracy profiling using a random forest algorithm.
 

High sensitivity, specificity

Among the 200 patients (mean age, 31 years) enrolled in the study, 76.5% (n = 153) were diagnosed with endometriosis. On average, their pain was statistically more severe than that of the women in the control group. The Visual Analogue Scale (VAS) scores were, respectively: dysmenorrhea 6 versus 5.0 (P < .001), dyspareunia 5.28 versus 4.95 (P < .001), and urinary pain during menstruation 4.35 versus 2.84 (P < .001).

Next-generation sequencing identified an average of 2,561 expressed miRNAs in the saliva samples. The feature selection method generated a subset of 109 miRNAs composing the endometriosis diagnostic signature. Among those miRNAs, 29 were associated with the main signaling pathways of endometriosis: PI3K/AKT, PTEN, Wnt/beta-catenin, HIF1-alpha/NF kappa B, and YAP/TAZ/EGFR.

The accuracy and reproducibility of the signature were tested on several data sets randomly composed of the same proportion of controls and patients with endometriosis. The respective sensitivity, specificity, and area under the curve for the diagnostic miRNA signature were 96.7%, 100%, and 98.3%, respectively.

The study’s results support the use of a saliva-based miRNA signature for diagnosing whether a patient is discordant/complex (chronic pelvic pain suggestive of endometriosis and both negative clinical examination and imaging findings) or has early-stage or advanced-stage endometriosis.

A version of this article first appeared on Medscape.com.

A French research team has developed a microRNA (miRNA) signature for diagnosing endometriosis through a simple saliva test. Its validation in a larger cohort could soon allow doctors to have a cheap, noninvasive, and accurate tool to use in diagnosing a disease that, for the time being, is difficult to identify with any certainty. The researchers suggest that their methodology could be used as a blueprint to investigate other pathologies, both benign and malignant.

ENDO-miRNA study

miRNAs regulate as much as 60% of gene expression at the posttranscriptional level. In the setting of endometriosis, several authors have evaluated the relevance of a blood-based miRNA signature, but the results are discordant because of methodological and control group issues. Other researchers have also sought to develop a miRNA saliva test. A French team wanted to determine whether it was possible to define a saliva-based diagnostic miRNome signature that would allow patients with and without endometriosis to be differentiated and, from there, develop the first specific diagnostic test for the disease.

The prospective ENDO-miRNA study included saliva samples obtained from women with chronic pelvic pain suggestive of endometriosis. Exploratory procedures were performed to look for lesions. All the patients underwent either a laparoscopic procedure (therapeutic or diagnostic laparoscopy) and/or MRI imaging. For the patients who underwent laparoscopy, diagnosis was confirmed by histology. For the patients diagnosed with endometriosis without laparoscopic evaluation, all had MRI imaging with features of deep endometriosis.

One part of the study involved the identification of a biomarker based on genomewide miRNA expression profiling by small RNA sequencing using next-generation sequencing. The second part involved the development of a saliva-based miRNA diagnostic signature according to expression and accuracy profiling using a random forest algorithm.
 

High sensitivity, specificity

Among the 200 patients (mean age, 31 years) enrolled in the study, 76.5% (n = 153) were diagnosed with endometriosis. On average, their pain was statistically more severe than that of the women in the control group. The Visual Analogue Scale (VAS) scores were, respectively: dysmenorrhea 6 versus 5.0 (P < .001), dyspareunia 5.28 versus 4.95 (P < .001), and urinary pain during menstruation 4.35 versus 2.84 (P < .001).

Next-generation sequencing identified an average of 2,561 expressed miRNAs in the saliva samples. The feature selection method generated a subset of 109 miRNAs composing the endometriosis diagnostic signature. Among those miRNAs, 29 were associated with the main signaling pathways of endometriosis: PI3K/AKT, PTEN, Wnt/beta-catenin, HIF1-alpha/NF kappa B, and YAP/TAZ/EGFR.

The accuracy and reproducibility of the signature were tested on several data sets randomly composed of the same proportion of controls and patients with endometriosis. The respective sensitivity, specificity, and area under the curve for the diagnostic miRNA signature were 96.7%, 100%, and 98.3%, respectively.

The study’s results support the use of a saliva-based miRNA signature for diagnosing whether a patient is discordant/complex (chronic pelvic pain suggestive of endometriosis and both negative clinical examination and imaging findings) or has early-stage or advanced-stage endometriosis.

A version of this article first appeared on Medscape.com.