Rectal misoprostol has merit
It is well established in medicine that IV medications have a rapid onset of action. Therefore, IV uterotonics would be the first choice to control PPH. Most likely they will control the majority of uterine atony.
However, the causes of uterine atony are numerous, and they most commonly include prolonged labor and/or infection. Like any fatigued muscle, there is rebound relaxation. Intravenous uterotonics have a very short half-life and have a maximum total dose. Repeating oxytocin 40 U in a 1,000-mL infusion over 15 minutes carries the risk of water intoxication due to the antidiuretic effect.
Misoprostol 800 to 1,000 mg when used rectally will have a longer effect—up to 4 hours—and fewer side effects. It should be used in combination with other parenteral uterotonics to act in synergistic way. This way the more serious cases of PPH can be reduced or even prevented.
Raymond Michael, MD
Marshall, Minnesota
Dr. Barbieri responds
I deeply appreciate the perspectives provided by Drs. Barnes, Zapata, Mariona, and Michael. The obstetricians and gynecologists who read OBG Management have vast clinical experience, expertise, and exceptional insights. By sharing our knowledge with each other we best advance the care provided to women and their families.
As a hospitalist, Dr. Barnes is privileged to care for women at the highest-risk time of their pregnancy. I think his BEPCOP proactive protocol to reduce the rate of PPH is superb and urge him to publish his experience. I appreciate Dr. Zapata’s insight that misoprostol tablets from different manufacturers have markedly different rates of dissolution. I agree with him that I have seen entire, undissolved misoprostol tablets expelled from the rectum many hours after they were administered for the treatment of PPH. If the tablet does not dissolve, it certainly cannot work. Dr. Mariona’s guidance to adhere to protocol bundles and continuously improve and update the bundles is absolutely critical to advancing health care for pregnant women. Dr. Michael rightly points out that one advantage of misoprostol is that it has a longer half-life than many parenteral uterotonics. However, in my practice I prefer Dr. Barnes’ BEPCOP protocol involving the multi-hour administration of oxytocin to prevent and treat a PPH.