Mifepristone-misoprostol for the treatment of early missed miscarriage with a gestational sac
For patients with a miscarriage, the treatment options to resolve the pregnancy loss are expectant management, medication, or surgery.12 Joint decision-making is recommended to establish a management plan that supports the patient’s values. Expectant management is most likely to result in a multi-week process to achieve completion of the miscarriage. A surgical procedure is most likely to result in rapid resolution of the miscarriage with the greatest rate of success. Surgical evacuation of the uterus may be the preferred option for patients who have excessive uterine bleeding or concerning vital signs. Both medical and surgical management are more likely than expectant management to successfully resolve the miscarriage.13
In the past, the standard approach to medication management of a miscarriage was the administration of one or more doses of misoprostol, a synthetic prostaglandin E1. However, two large trials have reported that the dual-medication sequence of mifepristone followed 24 to 48 hours later by misoprostol is more effective than misoprostol alone for resolving a miscarriage.14,15 This is probably due to mifepristone making the uterus more responsive to the effects of misoprostol.
Schreiber and colleagues14 reported a study of 300 patients with an anembryonic gestation or embryonic demise, between 5 and 12 completed weeks of gestation, who were randomly assigned to treatment with mifepristone (200 mg) followed in 24 to 48 hours with vaginal misoprostol (800 µg) or vaginal misoprostol (800 µg) alone. Ultrasonography was performed 1 to 4 days after misoprostol administration. Successful treatment was defined as expulsion of the gestational sac plus no additional surgical or medical intervention within 30 days after treatment. In this study, the dual-medication regimen of mifepristone-misoprostol was more successful than misoprostol alone in resolving the miscarriage, 84% and 67%, respectively (relative risk [RR], 1.25; 95% confidence interval [CI], 1.09–1.43).
Surgical evacuation of the uterus occurred less often with mifepristone-misoprostol treatment than with misoprostol monotherapy—9% and 24%, respectively (RR, 0.37; 95% CI, 0.21–0.68). Pelvic infection occurred in 2 patients (1.3%) in each group. Uterine bleeding managed with blood transfusion occurred in 3 patients who received mifepristone-misoprostol and 1 patient who received misoprostol alone. In this study, clinical factors including active bleeding, parity, and gestational age did not influence treatment success with the mifepristone-misoprostol regimen.16 The mifepristone-misoprostol regimen was reported to be more cost-effective than misoprostol alone.17
Chu and colleagues15 reported a study of medication treatment of missed miscarriage that included more than 700 patients randomly assigned to treatment with mifepristone-misoprostol or placebo-misoprostol. Missed miscarriage was diagnosed by an ultrasound demonstrating a gestational sac and a nonviable pregnancy. The doses of mifepristone and misoprostol were 200 mg and 800 µg, respectively. In this study the misoprostol was administered 48 hours following mifepristone or placebo using a vaginal, oral, or buccal route, but 90% of patients used the vaginal route. Treatment was considered successful if the patient passed the gestational sac as determined by an ultrasound performed 7 days after entry into the study. If the gestational sac was passed, the patients were asked to do a urine pregnancy test 3 weeks after entering the study to conclude their care episode. If patients did not pass the gestational sac, they were offered a second dose of misoprostol or surgical evacuation. In this study, mifepristone-misoprostol resulted in fewer patients who did not pass the gestational sac within 7 days after entry into the study than placebo (mifepristone-misoprostol, 17% vs placebo-misoprostol, 24% (P=.043). Surgical intervention was performed in 25% of patients treated with placebo-misoprostol and 17% of patients treated with mifepristone-misoprostol (RR, 0.73; 95% CI, 0.53–0.95; P=.021). A cost-effectiveness analysis of the trial results reported that the combination of mifepristone-misoprostol was less costly than misoprostol alone for the management of missed miscarriages.18
Misoprostol can be administered by an oral, buccal, rectal, or vaginal route.19,20 Vaginal administration results in higher circulating concentrations of misoprostol than buccal administration, but both routes of administration produce similar mean uterine tone and mean uterine activity as measured by an intrauterine pressure transducer over 5 hours.21 Hence, at our institution, we most often use buccal administration of misoprostol. To assess effectiveness of mifepristone-misoprostol treatment, 1 week after treatment with a pelvic ultrasound to detect expulsion of the gestational sac. Alternatively, a urine pregnancy test can be performed 3 weeks following medication treatment. The mifepristone-misoprostol regimen is not approved by the US Food and Drug Administration for the treatment of miscarriage.
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