OBG Management

Preeclampsia complicates 3% to 8% of pregnancies.^1-3 The incidence of preeclampsia is influenced by the clinical characteristics of the pregnant population, including the prevalence of overweight, obesity, chronic hypertension, diabetes, nulliparity, advanced maternal age, multiple gestations, kidney disease, and a history of preeclampsia in a prior pregnancy.⁴

Magnesium treatment reduces the rate of eclampsia among patients with preeclampsia

For patients with preeclampsia, magnesium treatment reduces the risk of seizure. In the Magpie trial, 9,992 pregnant patients were treated for 24 hours with magnesium or placebo.⁵ The magnesium treatment regimen was either a 4-g IV bolus over 10 to 15 minutes followed by a continuous infusion of 1 g/hr or an intramuscular regimen (10-g intramuscular loading dose followed by 5 g IM every 4 hours). Eclamptic seizures occurred in 0.8% and 1.9% of patients treated with magnesium or placebo, respectively (relative risk [RR], 0.42; 95% confidence interval [CI], 0.29 to 0.60). Among patients with a multiple gestation, the rate of eclampsia was 2% and 6% in the patients treated with magnesium or placebo, respectively. The number of patients who needed to be treated to prevent one eclamptic event was 63 and 109 for patients with preeclampsia with and without severe features, respectively. Intrapartum treatment with magnesium also reduced the risk of placental abruption from 3.2% for the patients receiving placebo to 2.0% among the patients treated with magnesium (RR, 0.67; 99% CI, 0.45- 0.89). Maternal death was reduced with magnesium treatment compared with placebo (0.2% vs 0.4%), but the difference was not statistically significant.

In the Magpie trial, side effects were reported by 24% and 5% of patients treated with magnesium and placebo, respectively. The most common side effects were flushing, nausea, vomiting, and muscle weakness. Of note, magnesium treatment is contraindicated in patients with myasthenia gravis because it can cause muscle weakness and hypoventilation.⁶ For patients with preeclampsia and myasthenia gravis, levetiracetam may be utilized to reduce the risk of seizure.⁶

Duration of postpartum magnesium treatment

There are no studies with a sufficient number of participants to definitively determine the optimal duration of postpartum magnesium therapy. A properly powered study would likely require more than 16,000 to 20,000 participants to identify clinically meaningful differences in the rate of postpartum eclampsia among patients treated with magnesium for 12 or 24 hours.^7,8 It is unlikely that such a study will be completed. Hence, the duration of postpartum magnesium must be based on clinical judgment, balancing the risks and benefits of treatment.

The American College of Obstetricians and Gynecologists (ACOG) recommends continuing magnesium treatment for 24 hours postpartum. They advise, “For patients requiring cesarean delivery (before the onset of labor), the infusion should ideally begin before surgery and continue during surgery, as well as 24 hours afterwards. For patients who deliver vaginally, the infusion should continue for 24 hours after delivery.”⁹

Multiple randomized trials have reported on the outcomes associated with 12 hours versus 24 hours of postpartum magnesium therapy (TABLE). Because the rate of postpartum eclamptic seizure is very low, none of the studies were sufficiently powered to provide a definitive answer to the benefits and harms of the shorter versus longer time frame of magnesium therapy.^10-15

Continue to: The harms of prolonged postpartum magnesium infusion...

The harms of prolonging treatment with postpartum magnesium infusion are generally not emphasized in the medical literature. However, side effects that can occur are flushing, nausea, vomiting, and muscle weakness, delayed early ambulation, delayed return to full diet, delayed discontinuation of a bladder catheter, and delayed initiation of breastfeeding.^5,15 In one large clinical trial, 1,113 patients with preeclampsia with severe features who received intrapartum magnesium for ≥8 hours were randomized after birth to immediate discontinuation of magnesium or continuation of magnesium for 24 hours.¹⁵ There was 1 seizure in the group of 555 patients who received 24 hours of postpartum magnesium and 2 seizures in the group of 558 patients who received no magnesium after birth. In this trial, continuation of magnesium postpartum resulted in delayed initiation of breastfeeding and delayed ambulation.¹⁵

Balancing the benefits and harms of postpartum magnesium infusion

An important clinical point is that magnesium treatment will not prevent all seizures associated with preeclampsia; in the Magpie trial, among the 5,055 patients with preeclampsia treated with magnesium there were 40 (0.8%) seizures.⁵ Magnesium treatment will reduce but not eliminate the risk of seizure. Clinicians should have a plan to treat seizures that occur while a woman is being treated with magnesium.

In the absence of high-quality data to guide the duration of postpartum magnesium therapy it is best to use clinical parameters to balance the benefits and harms of postpartum magnesium treatment.^16-18 Patients may want to participate in the decision about the duration of postpartum magnesium treatment after receiving counseling about the benefits and harms.

For patients with preeclampsia without severe features, many clinicians are no longer ordering intrapartum magnesium for prevention of seizures because they believe the risk of seizure in patients without severe disease is very low. Hence, these patients will not receive postpartum magnesium treatment unless they evolve to preeclampsia with severe features or develop a “red flag” warning postpartum (see below).

For patients with preeclampsia without severe features who received intrapartum magnesium, after birth, the magnesium infusion could be stopped immediately or within 12 hours of birth. For patients with preeclampsia without severe features, early termination of the magnesium infusion best balances the benefit of seizure reduction with the harms of delayed early ambulation, return to full diet, discontinuation of the bladder catheter, and initiation of breastfeeding.

For patients with preeclampsia with severe features, 24 hours of magnesium may best balance the benefits and harms of treatment. However, if the patient continues to have “red flag” findings, continued magnesium treatment beyond 24 hours may be warranted.

Red flag findings include: an eclamptic seizure before or after birth, ongoing or recurring severe headaches, visual scotomata, nausea, vomiting, epigastric pain, severe hypertension, oliguria, rising creatinine, or liver transaminases and declining platelet count.

The hypertensive diseases of pregnancy, including preeclampsia often appear suddenly and may evolve rapidly, threatening the health of both mother and fetus. A high level of suspicion that a hypertensive disease might be the cause of vague symptoms such as epigastric discomfort or headache may accelerate early diagnosis. Rapid treatment of severe hypertension with intravenous labetalol and hydralazine, and intrapartum plus postpartum administration of magnesium to prevent placental abruption and eclampsia will optimize patient outcomes. No patient, patient’s family members, or clinician, wants to experience the grief of a preventable maternal, fetal, or newborn death due to hypertension.¹⁹ Obstetricians, midwives, labor nurses, obstetrical anesthesiologists and doulas play key roles in preventing maternal, fetal, and newborn morbidity and death from hypertensive diseases of pregnancy. As a team we are the last line of defense protecting the health of our patients. ●

Preeclampsia complicates 3% to 8% of pregnancies.^1-3 The incidence of preeclampsia is influenced by the clinical characteristics of the pregnant population, including the prevalence of overweight, obesity, chronic hypertension, diabetes, nulliparity, advanced maternal age, multiple gestations, kidney disease, and a history of preeclampsia in a prior pregnancy.⁴

Magnesium treatment reduces the rate of eclampsia among patients with preeclampsia

For patients with preeclampsia, magnesium treatment reduces the risk of seizure. In the Magpie trial, 9,992 pregnant patients were treated for 24 hours with magnesium or placebo.⁵ The magnesium treatment regimen was either a 4-g IV bolus over 10 to 15 minutes followed by a continuous infusion of 1 g/hr or an intramuscular regimen (10-g intramuscular loading dose followed by 5 g IM every 4 hours). Eclamptic seizures occurred in 0.8% and 1.9% of patients treated with magnesium or placebo, respectively (relative risk [RR], 0.42; 95% confidence interval [CI], 0.29 to 0.60). Among patients with a multiple gestation, the rate of eclampsia was 2% and 6% in the patients treated with magnesium or placebo, respectively. The number of patients who needed to be treated to prevent one eclamptic event was 63 and 109 for patients with preeclampsia with and without severe features, respectively. Intrapartum treatment with magnesium also reduced the risk of placental abruption from 3.2% for the patients receiving placebo to 2.0% among the patients treated with magnesium (RR, 0.67; 99% CI, 0.45- 0.89). Maternal death was reduced with magnesium treatment compared with placebo (0.2% vs 0.4%), but the difference was not statistically significant.

In the Magpie trial, side effects were reported by 24% and 5% of patients treated with magnesium and placebo, respectively. The most common side effects were flushing, nausea, vomiting, and muscle weakness. Of note, magnesium treatment is contraindicated in patients with myasthenia gravis because it can cause muscle weakness and hypoventilation.⁶ For patients with preeclampsia and myasthenia gravis, levetiracetam may be utilized to reduce the risk of seizure.⁶

Duration of postpartum magnesium treatment

There are no studies with a sufficient number of participants to definitively determine the optimal duration of postpartum magnesium therapy. A properly powered study would likely require more than 16,000 to 20,000 participants to identify clinically meaningful differences in the rate of postpartum eclampsia among patients treated with magnesium for 12 or 24 hours.^7,8 It is unlikely that such a study will be completed. Hence, the duration of postpartum magnesium must be based on clinical judgment, balancing the risks and benefits of treatment.

The American College of Obstetricians and Gynecologists (ACOG) recommends continuing magnesium treatment for 24 hours postpartum. They advise, “For patients requiring cesarean delivery (before the onset of labor), the infusion should ideally begin before surgery and continue during surgery, as well as 24 hours afterwards. For patients who deliver vaginally, the infusion should continue for 24 hours after delivery.”⁹

Multiple randomized trials have reported on the outcomes associated with 12 hours versus 24 hours of postpartum magnesium therapy (TABLE). Because the rate of postpartum eclamptic seizure is very low, none of the studies were sufficiently powered to provide a definitive answer to the benefits and harms of the shorter versus longer time frame of magnesium therapy.^10-15

Continue to: The harms of prolonged postpartum magnesium infusion...

The harms of prolonging treatment with postpartum magnesium infusion are generally not emphasized in the medical literature. However, side effects that can occur are flushing, nausea, vomiting, and muscle weakness, delayed early ambulation, delayed return to full diet, delayed discontinuation of a bladder catheter, and delayed initiation of breastfeeding.^5,15 In one large clinical trial, 1,113 patients with preeclampsia with severe features who received intrapartum magnesium for ≥8 hours were randomized after birth to immediate discontinuation of magnesium or continuation of magnesium for 24 hours.¹⁵ There was 1 seizure in the group of 555 patients who received 24 hours of postpartum magnesium and 2 seizures in the group of 558 patients who received no magnesium after birth. In this trial, continuation of magnesium postpartum resulted in delayed initiation of breastfeeding and delayed ambulation.¹⁵

Balancing the benefits and harms of postpartum magnesium infusion

An important clinical point is that magnesium treatment will not prevent all seizures associated with preeclampsia; in the Magpie trial, among the 5,055 patients with preeclampsia treated with magnesium there were 40 (0.8%) seizures.⁵ Magnesium treatment will reduce but not eliminate the risk of seizure. Clinicians should have a plan to treat seizures that occur while a woman is being treated with magnesium.

In the absence of high-quality data to guide the duration of postpartum magnesium therapy it is best to use clinical parameters to balance the benefits and harms of postpartum magnesium treatment.^16-18 Patients may want to participate in the decision about the duration of postpartum magnesium treatment after receiving counseling about the benefits and harms.

For patients with preeclampsia without severe features, many clinicians are no longer ordering intrapartum magnesium for prevention of seizures because they believe the risk of seizure in patients without severe disease is very low. Hence, these patients will not receive postpartum magnesium treatment unless they evolve to preeclampsia with severe features or develop a “red flag” warning postpartum (see below).

For patients with preeclampsia without severe features who received intrapartum magnesium, after birth, the magnesium infusion could be stopped immediately or within 12 hours of birth. For patients with preeclampsia without severe features, early termination of the magnesium infusion best balances the benefit of seizure reduction with the harms of delayed early ambulation, return to full diet, discontinuation of the bladder catheter, and initiation of breastfeeding.

For patients with preeclampsia with severe features, 24 hours of magnesium may best balance the benefits and harms of treatment. However, if the patient continues to have “red flag” findings, continued magnesium treatment beyond 24 hours may be warranted.

Red flag findings include: an eclamptic seizure before or after birth, ongoing or recurring severe headaches, visual scotomata, nausea, vomiting, epigastric pain, severe hypertension, oliguria, rising creatinine, or liver transaminases and declining platelet count.

The hypertensive diseases of pregnancy, including preeclampsia often appear suddenly and may evolve rapidly, threatening the health of both mother and fetus. A high level of suspicion that a hypertensive disease might be the cause of vague symptoms such as epigastric discomfort or headache may accelerate early diagnosis. Rapid treatment of severe hypertension with intravenous labetalol and hydralazine, and intrapartum plus postpartum administration of magnesium to prevent placental abruption and eclampsia will optimize patient outcomes. No patient, patient’s family members, or clinician, wants to experience the grief of a preventable maternal, fetal, or newborn death due to hypertension.¹⁹ Obstetricians, midwives, labor nurses, obstetrical anesthesiologists and doulas play key roles in preventing maternal, fetal, and newborn morbidity and death from hypertensive diseases of pregnancy. As a team we are the last line of defense protecting the health of our patients. ●

Preeclampsia complicates 3% to 8% of pregnancies.^1-3 The incidence of preeclampsia is influenced by the clinical characteristics of the pregnant population, including the prevalence of overweight, obesity, chronic hypertension, diabetes, nulliparity, advanced maternal age, multiple gestations, kidney disease, and a history of preeclampsia in a prior pregnancy.⁴

Magnesium treatment reduces the rate of eclampsia among patients with preeclampsia

For patients with preeclampsia, magnesium treatment reduces the risk of seizure. In the Magpie trial, 9,992 pregnant patients were treated for 24 hours with magnesium or placebo.⁵ The magnesium treatment regimen was either a 4-g IV bolus over 10 to 15 minutes followed by a continuous infusion of 1 g/hr or an intramuscular regimen (10-g intramuscular loading dose followed by 5 g IM every 4 hours). Eclamptic seizures occurred in 0.8% and 1.9% of patients treated with magnesium or placebo, respectively (relative risk [RR], 0.42; 95% confidence interval [CI], 0.29 to 0.60). Among patients with a multiple gestation, the rate of eclampsia was 2% and 6% in the patients treated with magnesium or placebo, respectively. The number of patients who needed to be treated to prevent one eclamptic event was 63 and 109 for patients with preeclampsia with and without severe features, respectively. Intrapartum treatment with magnesium also reduced the risk of placental abruption from 3.2% for the patients receiving placebo to 2.0% among the patients treated with magnesium (RR, 0.67; 99% CI, 0.45- 0.89). Maternal death was reduced with magnesium treatment compared with placebo (0.2% vs 0.4%), but the difference was not statistically significant.

In the Magpie trial, side effects were reported by 24% and 5% of patients treated with magnesium and placebo, respectively. The most common side effects were flushing, nausea, vomiting, and muscle weakness. Of note, magnesium treatment is contraindicated in patients with myasthenia gravis because it can cause muscle weakness and hypoventilation.⁶ For patients with preeclampsia and myasthenia gravis, levetiracetam may be utilized to reduce the risk of seizure.⁶

Duration of postpartum magnesium treatment

There are no studies with a sufficient number of participants to definitively determine the optimal duration of postpartum magnesium therapy. A properly powered study would likely require more than 16,000 to 20,000 participants to identify clinically meaningful differences in the rate of postpartum eclampsia among patients treated with magnesium for 12 or 24 hours.^7,8 It is unlikely that such a study will be completed. Hence, the duration of postpartum magnesium must be based on clinical judgment, balancing the risks and benefits of treatment.

The American College of Obstetricians and Gynecologists (ACOG) recommends continuing magnesium treatment for 24 hours postpartum. They advise, “For patients requiring cesarean delivery (before the onset of labor), the infusion should ideally begin before surgery and continue during surgery, as well as 24 hours afterwards. For patients who deliver vaginally, the infusion should continue for 24 hours after delivery.”⁹

Multiple randomized trials have reported on the outcomes associated with 12 hours versus 24 hours of postpartum magnesium therapy (TABLE). Because the rate of postpartum eclamptic seizure is very low, none of the studies were sufficiently powered to provide a definitive answer to the benefits and harms of the shorter versus longer time frame of magnesium therapy.^10-15

Continue to: The harms of prolonged postpartum magnesium infusion...

The harms of prolonging treatment with postpartum magnesium infusion are generally not emphasized in the medical literature. However, side effects that can occur are flushing, nausea, vomiting, and muscle weakness, delayed early ambulation, delayed return to full diet, delayed discontinuation of a bladder catheter, and delayed initiation of breastfeeding.^5,15 In one large clinical trial, 1,113 patients with preeclampsia with severe features who received intrapartum magnesium for ≥8 hours were randomized after birth to immediate discontinuation of magnesium or continuation of magnesium for 24 hours.¹⁵ There was 1 seizure in the group of 555 patients who received 24 hours of postpartum magnesium and 2 seizures in the group of 558 patients who received no magnesium after birth. In this trial, continuation of magnesium postpartum resulted in delayed initiation of breastfeeding and delayed ambulation.¹⁵

Balancing the benefits and harms of postpartum magnesium infusion

An important clinical point is that magnesium treatment will not prevent all seizures associated with preeclampsia; in the Magpie trial, among the 5,055 patients with preeclampsia treated with magnesium there were 40 (0.8%) seizures.⁵ Magnesium treatment will reduce but not eliminate the risk of seizure. Clinicians should have a plan to treat seizures that occur while a woman is being treated with magnesium.

In the absence of high-quality data to guide the duration of postpartum magnesium therapy it is best to use clinical parameters to balance the benefits and harms of postpartum magnesium treatment.^16-18 Patients may want to participate in the decision about the duration of postpartum magnesium treatment after receiving counseling about the benefits and harms.

For patients with preeclampsia without severe features, many clinicians are no longer ordering intrapartum magnesium for prevention of seizures because they believe the risk of seizure in patients without severe disease is very low. Hence, these patients will not receive postpartum magnesium treatment unless they evolve to preeclampsia with severe features or develop a “red flag” warning postpartum (see below).

For patients with preeclampsia without severe features who received intrapartum magnesium, after birth, the magnesium infusion could be stopped immediately or within 12 hours of birth. For patients with preeclampsia without severe features, early termination of the magnesium infusion best balances the benefit of seizure reduction with the harms of delayed early ambulation, return to full diet, discontinuation of the bladder catheter, and initiation of breastfeeding.

For patients with preeclampsia with severe features, 24 hours of magnesium may best balance the benefits and harms of treatment. However, if the patient continues to have “red flag” findings, continued magnesium treatment beyond 24 hours may be warranted.

Red flag findings include: an eclamptic seizure before or after birth, ongoing or recurring severe headaches, visual scotomata, nausea, vomiting, epigastric pain, severe hypertension, oliguria, rising creatinine, or liver transaminases and declining platelet count.

The hypertensive diseases of pregnancy, including preeclampsia often appear suddenly and may evolve rapidly, threatening the health of both mother and fetus. A high level of suspicion that a hypertensive disease might be the cause of vague symptoms such as epigastric discomfort or headache may accelerate early diagnosis. Rapid treatment of severe hypertension with intravenous labetalol and hydralazine, and intrapartum plus postpartum administration of magnesium to prevent placental abruption and eclampsia will optimize patient outcomes. No patient, patient’s family members, or clinician, wants to experience the grief of a preventable maternal, fetal, or newborn death due to hypertension.¹⁹ Obstetricians, midwives, labor nurses, obstetrical anesthesiologists and doulas play key roles in preventing maternal, fetal, and newborn morbidity and death from hypertensive diseases of pregnancy. As a team we are the last line of defense protecting the health of our patients. ●

For uncomplicated chlamydia infection in a pregnant woman, what is the most appropriate treatment?

Continue to the answer...

Uncomplicated chlamydia infection in a pregnant woman should be treated with a single 1,000-mg oral dose of azithromycin. An acceptable alternative is amoxicillin 500 mg orally 3 times daily for 7 days.

In a nonpregnant patient, doxycycline 100 mg orally twice daily for 7 days is also an appropriate alternative. However, doxycycline is relatively expensive and may not be well tolerated because of gastrointestinal adverse effects. (Workowski KA, Bolan GA. Sexually transmitted diseases treatment guidelines, 2015. MMWR Morbid Mortal Wkly Rep. 2015;64[RR3]:1-137.)

For uncomplicated chlamydia infection in a pregnant woman, what is the most appropriate treatment?

Continue to the answer...

Uncomplicated chlamydia infection in a pregnant woman should be treated with a single 1,000-mg oral dose of azithromycin. An acceptable alternative is amoxicillin 500 mg orally 3 times daily for 7 days.

In a nonpregnant patient, doxycycline 100 mg orally twice daily for 7 days is also an appropriate alternative. However, doxycycline is relatively expensive and may not be well tolerated because of gastrointestinal adverse effects. (Workowski KA, Bolan GA. Sexually transmitted diseases treatment guidelines, 2015. MMWR Morbid Mortal Wkly Rep. 2015;64[RR3]:1-137.)

For uncomplicated chlamydia infection in a pregnant woman, what is the most appropriate treatment?

Continue to the answer...

Uncomplicated chlamydia infection in a pregnant woman should be treated with a single 1,000-mg oral dose of azithromycin. An acceptable alternative is amoxicillin 500 mg orally 3 times daily for 7 days.

In a nonpregnant patient, doxycycline 100 mg orally twice daily for 7 days is also an appropriate alternative. However, doxycycline is relatively expensive and may not be well tolerated because of gastrointestinal adverse effects. (Workowski KA, Bolan GA. Sexually transmitted diseases treatment guidelines, 2015. MMWR Morbid Mortal Wkly Rep. 2015;64[RR3]:1-137.)

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For uncomplicated gonorrhea in a pregnant woman, what is the most appropriate treatment?

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The current recommendation from the Centers for Disease Control and Prevention for treatment of uncomplicated gonorrhea is a single 500-mg intramuscular dose of ceftriaxone. For the patient who is opposed to an intramuscular injection, an alternative treatment is cefixime 800 mg orally. With either of these regimens, if chlamydia infection cannot be excluded, the pregnant patient also should receive azithromycin 1,000 mg orally in a single dose. In a nonpregnant patient, doxycycline 100 mg orally twice daily for 7 days should be used to cover for concurrent chlamydia infection.

In a patient with an allergy to β-lactam antibiotics, an alternative regimen for treatment of uncomplicated gonorrhea is intramuscular gentamicin 240 mg plus a single 2,000-mg dose of oral azithromycin. (St Cyr S, Barbee L, Workowski KA, et al. Update to CDC’s treatment guidelines for gonococcal infection, 2020. MMWR Morbid Mortal Wkly Rep. 2020;69:1911-1916.)

For uncomplicated gonorrhea in a pregnant woman, what is the most appropriate treatment?

Continue to the answer...

The current recommendation from the Centers for Disease Control and Prevention for treatment of uncomplicated gonorrhea is a single 500-mg intramuscular dose of ceftriaxone. For the patient who is opposed to an intramuscular injection, an alternative treatment is cefixime 800 mg orally. With either of these regimens, if chlamydia infection cannot be excluded, the pregnant patient also should receive azithromycin 1,000 mg orally in a single dose. In a nonpregnant patient, doxycycline 100 mg orally twice daily for 7 days should be used to cover for concurrent chlamydia infection.

In a patient with an allergy to β-lactam antibiotics, an alternative regimen for treatment of uncomplicated gonorrhea is intramuscular gentamicin 240 mg plus a single 2,000-mg dose of oral azithromycin. (St Cyr S, Barbee L, Workowski KA, et al. Update to CDC’s treatment guidelines for gonococcal infection, 2020. MMWR Morbid Mortal Wkly Rep. 2020;69:1911-1916.)

For uncomplicated gonorrhea in a pregnant woman, what is the most appropriate treatment?

Continue to the answer...

The current recommendation from the Centers for Disease Control and Prevention for treatment of uncomplicated gonorrhea is a single 500-mg intramuscular dose of ceftriaxone. For the patient who is opposed to an intramuscular injection, an alternative treatment is cefixime 800 mg orally. With either of these regimens, if chlamydia infection cannot be excluded, the pregnant patient also should receive azithromycin 1,000 mg orally in a single dose. In a nonpregnant patient, doxycycline 100 mg orally twice daily for 7 days should be used to cover for concurrent chlamydia infection.

In a patient with an allergy to β-lactam antibiotics, an alternative regimen for treatment of uncomplicated gonorrhea is intramuscular gentamicin 240 mg plus a single 2,000-mg dose of oral azithromycin. (St Cyr S, Barbee L, Workowski KA, et al. Update to CDC’s treatment guidelines for gonococcal infection, 2020. MMWR Morbid Mortal Wkly Rep. 2020;69:1911-1916.)

What is the most appropriate treatment for trichomonas infection in pregnancy?

Continue to the answer...

Trichomonas infection should be treated with oral metronidazole 500 mg twice daily for 7 days. Metronidazole also can be given as a single oral 2-g dose. This treatment is not quite as effective as the multidose regimen, but it may be appropriate for patients who are not likely to be adherent with the longer course of treatment.

Resistance to metronidazole is rare; in such instances, oral tinidazole 2 g in a single dose may be effective.

What is the most appropriate treatment for trichomonas infection in pregnancy?

Continue to the answer...

Trichomonas infection should be treated with oral metronidazole 500 mg twice daily for 7 days. Metronidazole also can be given as a single oral 2-g dose. This treatment is not quite as effective as the multidose regimen, but it may be appropriate for patients who are not likely to be adherent with the longer course of treatment.

Resistance to metronidazole is rare; in such instances, oral tinidazole 2 g in a single dose may be effective.

What is the most appropriate treatment for trichomonas infection in pregnancy?

Continue to the answer...

Trichomonas infection should be treated with oral metronidazole 500 mg twice daily for 7 days. Metronidazole also can be given as a single oral 2-g dose. This treatment is not quite as effective as the multidose regimen, but it may be appropriate for patients who are not likely to be adherent with the longer course of treatment.

Resistance to metronidazole is rare; in such instances, oral tinidazole 2 g in a single dose may be effective.

Which vaccines are contraindicated in pregnancy?

Continue to the answer...

Which vaccines are contraindicated in pregnancy?

Continue to the answer...

Which vaccines are contraindicated in pregnancy?

Continue to the answer...

_{Text copyright DenseBreast-info.org.}

Answer

A. For women with extremely dense breasts who are not otherwise at increased risk for breast cancer, screening magnetic resonance imaging (MRI) is preferred, plus her mammogram or tomosynthesis. If MRI is not an option, consider ultrasonography or contrast-enhanced mammography. 

The same screening considerations apply to women with heterogeneously dense breasts; however, there is limited capacity for MRI or even ultrasound screening at many facilities. Research supports MRI in dense breasts, and abbreviated, lower-cost protocols have been validated that address some of the barriers to MRI.¹ Although not yet widely available, abbreviated MRI will likely have a greater role in screening women with dense breasts who are not high risk. It is important to note that preauthorization from insurance may be required for screening MRI, and in most US states, deductibles and copays apply.

The exam

Contrast-enhanced MRI requires IV injection of gadolinium-based contrast to look at the anatomy and blood flow patterns of the breast tissue. The patient lies face down with the breasts placed in two rectangular openings, or “coils.” The exam takes place inside the tunnel of the scanner, with the head facing out.After initial images are obtained, the contrast agent is injected into a vein in the arm, and additional images are taken, which will show areas of enhancement. The exam takes about 20 to 40 minutes. An “abbreviated” MRI can be performed for screening in some centers, which uses fewer sequences and takes about 10 minutes. 

Benefits

At least 40% of cancers are missed on mammography in women with dense breasts.² MRI is the most widely studied technique using a contrast agent, and it produces the highest additional cancer detection of all the supplemental technologies to date, yielding, in the first year, 10-16 additional cancers per 1,000 women screened after mammography/tomosynthesis (reviewed in Berg et al.³). The cancer-detection benefit is seen across all breast density categories, even among average-risk women.⁴ There is no ionizing radiation, and it has been shown to reduce the rate of interval cancers (those detected due to symptoms after a negative screening mammogram), as well as the rate of late-stage disease. Axillary lymph nodes can be examined at the same screening exam. 

While tomosynthesis improves cancer detection in women with fatty breasts, scattered fibroglandular breast tissue, and heterogeneously dense breasts, it does not significantly improve cancer detection in women with extremely dense breasts.^5,6 Current American Cancer Society and National Comprehensive Cancer Network guidelines recommend annual screening MRI for women at high risk for breast cancer (regardless of breast density); however, increasingly, research supports the effectiveness of MRI in women with dense breasts who are otherwise considered average risk. A large randomized controlled trial in the Netherlands compared outcomes in women with extremely dense breasts invited to have screening MRI after negative mammography to those assigned to continue receiving screening mammography only. The incremental cancer detection rate was 16.5 per 1,000 (79/4,783) women screened with MRI in the first round⁷ and 6 per 1,000 women screened in the second round 2 years later.⁸ The interval cancer rate was 0.8 per 1,000 (4/4,783) women screened with MRI, compared with 4.9 per 1,000 (16/3,278) women who declined MRI and received mammography only.⁷ 

Screening ultrasound will show up to 3 additional cancers per 1,000 women screened after mammography/tomosynthesis (reviewed in Vourtsis and Berg⁹ and Berg and Vourtsis¹⁰), far lower than the added cancer-detection rate of MRI. Consider screening ultrasound for women who cannot tolerate or access screening MRI.¹¹ Contrast-enhanced mammography (CEM) uses iodinated contrast (as in computed tomography). CEM is not widely available but appears to show cancer-detection similar to MRI. For further discussion, see Berg et al’s 2021 review.³ 

The FIGURE shows an example of an invasive cancer depicted on contrast-enhanced MRI in a 53-year-old woman with dense breasts and a family history of breast cancer that was not visible on tomosynthesis, even in retrospect, due to masking by dense tissue. 

Considerations

Breast MRI increases callbacks even after mammography and ultrasound; however, such false alarms are reduced in subsequent screening rounds. MRI cannot be performed in women who have certain metal implants— some pacemakers or spinal fixation rods—and is not recommended for pregnant women. Claustrophobia may be an issue for some women. MRI is expensive and requires IV contrast. Gadolinium is known to accumulate in the brain, although the long-term effects of this are unknown and no harm has been shown.●

_{Text copyright DenseBreast-info.org.}

Answer

A. For women with extremely dense breasts who are not otherwise at increased risk for breast cancer, screening magnetic resonance imaging (MRI) is preferred, plus her mammogram or tomosynthesis. If MRI is not an option, consider ultrasonography or contrast-enhanced mammography. 

The same screening considerations apply to women with heterogeneously dense breasts; however, there is limited capacity for MRI or even ultrasound screening at many facilities. Research supports MRI in dense breasts, and abbreviated, lower-cost protocols have been validated that address some of the barriers to MRI.¹ Although not yet widely available, abbreviated MRI will likely have a greater role in screening women with dense breasts who are not high risk. It is important to note that preauthorization from insurance may be required for screening MRI, and in most US states, deductibles and copays apply.

The exam

Contrast-enhanced MRI requires IV injection of gadolinium-based contrast to look at the anatomy and blood flow patterns of the breast tissue. The patient lies face down with the breasts placed in two rectangular openings, or “coils.” The exam takes place inside the tunnel of the scanner, with the head facing out.After initial images are obtained, the contrast agent is injected into a vein in the arm, and additional images are taken, which will show areas of enhancement. The exam takes about 20 to 40 minutes. An “abbreviated” MRI can be performed for screening in some centers, which uses fewer sequences and takes about 10 minutes. 

Benefits

At least 40% of cancers are missed on mammography in women with dense breasts.² MRI is the most widely studied technique using a contrast agent, and it produces the highest additional cancer detection of all the supplemental technologies to date, yielding, in the first year, 10-16 additional cancers per 1,000 women screened after mammography/tomosynthesis (reviewed in Berg et al.³). The cancer-detection benefit is seen across all breast density categories, even among average-risk women.⁴ There is no ionizing radiation, and it has been shown to reduce the rate of interval cancers (those detected due to symptoms after a negative screening mammogram), as well as the rate of late-stage disease. Axillary lymph nodes can be examined at the same screening exam. 

While tomosynthesis improves cancer detection in women with fatty breasts, scattered fibroglandular breast tissue, and heterogeneously dense breasts, it does not significantly improve cancer detection in women with extremely dense breasts.^5,6 Current American Cancer Society and National Comprehensive Cancer Network guidelines recommend annual screening MRI for women at high risk for breast cancer (regardless of breast density); however, increasingly, research supports the effectiveness of MRI in women with dense breasts who are otherwise considered average risk. A large randomized controlled trial in the Netherlands compared outcomes in women with extremely dense breasts invited to have screening MRI after negative mammography to those assigned to continue receiving screening mammography only. The incremental cancer detection rate was 16.5 per 1,000 (79/4,783) women screened with MRI in the first round⁷ and 6 per 1,000 women screened in the second round 2 years later.⁸ The interval cancer rate was 0.8 per 1,000 (4/4,783) women screened with MRI, compared with 4.9 per 1,000 (16/3,278) women who declined MRI and received mammography only.⁷ 

Screening ultrasound will show up to 3 additional cancers per 1,000 women screened after mammography/tomosynthesis (reviewed in Vourtsis and Berg⁹ and Berg and Vourtsis¹⁰), far lower than the added cancer-detection rate of MRI. Consider screening ultrasound for women who cannot tolerate or access screening MRI.¹¹ Contrast-enhanced mammography (CEM) uses iodinated contrast (as in computed tomography). CEM is not widely available but appears to show cancer-detection similar to MRI. For further discussion, see Berg et al’s 2021 review.³ 

The FIGURE shows an example of an invasive cancer depicted on contrast-enhanced MRI in a 53-year-old woman with dense breasts and a family history of breast cancer that was not visible on tomosynthesis, even in retrospect, due to masking by dense tissue. 

Considerations

Breast MRI increases callbacks even after mammography and ultrasound; however, such false alarms are reduced in subsequent screening rounds. MRI cannot be performed in women who have certain metal implants— some pacemakers or spinal fixation rods—and is not recommended for pregnant women. Claustrophobia may be an issue for some women. MRI is expensive and requires IV contrast. Gadolinium is known to accumulate in the brain, although the long-term effects of this are unknown and no harm has been shown.●

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Answer

A. For women with extremely dense breasts who are not otherwise at increased risk for breast cancer, screening magnetic resonance imaging (MRI) is preferred, plus her mammogram or tomosynthesis. If MRI is not an option, consider ultrasonography or contrast-enhanced mammography. 

The same screening considerations apply to women with heterogeneously dense breasts; however, there is limited capacity for MRI or even ultrasound screening at many facilities. Research supports MRI in dense breasts, and abbreviated, lower-cost protocols have been validated that address some of the barriers to MRI.¹ Although not yet widely available, abbreviated MRI will likely have a greater role in screening women with dense breasts who are not high risk. It is important to note that preauthorization from insurance may be required for screening MRI, and in most US states, deductibles and copays apply.

The exam

Contrast-enhanced MRI requires IV injection of gadolinium-based contrast to look at the anatomy and blood flow patterns of the breast tissue. The patient lies face down with the breasts placed in two rectangular openings, or “coils.” The exam takes place inside the tunnel of the scanner, with the head facing out.After initial images are obtained, the contrast agent is injected into a vein in the arm, and additional images are taken, which will show areas of enhancement. The exam takes about 20 to 40 minutes. An “abbreviated” MRI can be performed for screening in some centers, which uses fewer sequences and takes about 10 minutes. 

Benefits

At least 40% of cancers are missed on mammography in women with dense breasts.² MRI is the most widely studied technique using a contrast agent, and it produces the highest additional cancer detection of all the supplemental technologies to date, yielding, in the first year, 10-16 additional cancers per 1,000 women screened after mammography/tomosynthesis (reviewed in Berg et al.³). The cancer-detection benefit is seen across all breast density categories, even among average-risk women.⁴ There is no ionizing radiation, and it has been shown to reduce the rate of interval cancers (those detected due to symptoms after a negative screening mammogram), as well as the rate of late-stage disease. Axillary lymph nodes can be examined at the same screening exam. 

While tomosynthesis improves cancer detection in women with fatty breasts, scattered fibroglandular breast tissue, and heterogeneously dense breasts, it does not significantly improve cancer detection in women with extremely dense breasts.^5,6 Current American Cancer Society and National Comprehensive Cancer Network guidelines recommend annual screening MRI for women at high risk for breast cancer (regardless of breast density); however, increasingly, research supports the effectiveness of MRI in women with dense breasts who are otherwise considered average risk. A large randomized controlled trial in the Netherlands compared outcomes in women with extremely dense breasts invited to have screening MRI after negative mammography to those assigned to continue receiving screening mammography only. The incremental cancer detection rate was 16.5 per 1,000 (79/4,783) women screened with MRI in the first round⁷ and 6 per 1,000 women screened in the second round 2 years later.⁸ The interval cancer rate was 0.8 per 1,000 (4/4,783) women screened with MRI, compared with 4.9 per 1,000 (16/3,278) women who declined MRI and received mammography only.⁷ 

Screening ultrasound will show up to 3 additional cancers per 1,000 women screened after mammography/tomosynthesis (reviewed in Vourtsis and Berg⁹ and Berg and Vourtsis¹⁰), far lower than the added cancer-detection rate of MRI. Consider screening ultrasound for women who cannot tolerate or access screening MRI.¹¹ Contrast-enhanced mammography (CEM) uses iodinated contrast (as in computed tomography). CEM is not widely available but appears to show cancer-detection similar to MRI. For further discussion, see Berg et al’s 2021 review.³ 

The FIGURE shows an example of an invasive cancer depicted on contrast-enhanced MRI in a 53-year-old woman with dense breasts and a family history of breast cancer that was not visible on tomosynthesis, even in retrospect, due to masking by dense tissue. 

Considerations

Breast MRI increases callbacks even after mammography and ultrasound; however, such false alarms are reduced in subsequent screening rounds. MRI cannot be performed in women who have certain metal implants— some pacemakers or spinal fixation rods—and is not recommended for pregnant women. Claustrophobia may be an issue for some women. MRI is expensive and requires IV contrast. Gadolinium is known to accumulate in the brain, although the long-term effects of this are unknown and no harm has been shown.●