Vaginal Misoprostol Compared With Buccal Misoprostol for Termination of Second-Trimester Pregnancy: A Randomized Controlled Trial

24-Hour Compared With 12-Hour Mifepristone-Misoprostol Interval for Second-Trimester Abortion: A Randomized Controlled Trial

OBJECTIVE

To compare 24-hour and 12-hour mifepristone-to-misoprostol intervals for second-trimester medication abortion.

METHODS

We conducted a prospective randomized controlled trial. Participants were allocated to receive mifepristone either 24 hours or 12 hours before misoprostol administration. The primary outcome was the time from the first misoprostol administration to abortion (induction time). Secondary outcomes included the time from mifepristone to abortion (total abortion time); fetal expulsion percentages at 12, 24, and 48 hours after the first misoprostol dose; side effects proportion; and pain and satisfaction scores. A sample size of 40 per group (N=80) was planned to compare the 24- and 12-hour regimens.

RESULTS

Eighty patients were enrolled between July 2020 and June 2023, with 40 patients per group. Baseline characteristics were comparable between groups. Median induction time was 9.5 hours (95% CI, 10.3-17.8 hours) and 12.5 hours (95% CI, 13.5-20.2 hours) in the 24- and 12-hour interval arms, respectively ( P =.028). Median total abortion time was 33.0 hours (95% CI, 34.2-41.9 hours) and 24.5 hours (95% CI, 25.7-32.4 hours) in the 24- and 12-hour interval groups, respectively ( P <.001). At 12 hours from misoprostol administration, 25 patients (62.5%) in the 24-hour arm and 18 patients (45.0%) in the 12-hour arm completed abortion ( P =.178). At 24 hours from misoprostol administration, 36 patients (90.0%) in the 24-hour arm and 30 patients (75.0%) in the 12-hour arm had complete abortion ( P =.139). The need for additional medication or surgical treatment for uterine evacuation, pain scores, side effects, and satisfaction levels were not different between groups.

CONCLUSION

A 24-hour mifepristone-to-misoprostol regimen for medication abortion in the second trimester provides a median 3-hour shorter induction time compared with the 12-hour interval. However, the median total abortion time was 8.5-hours longer in the 24-hour interval regimen. These findings can aid in shared decision making before medication abortion in the second trimester.

CLINICAL TRIAL REGISTRATION

ClinicalTrials.gov, NCT04160221.

Medical regimens for abortion at 12 weeks and above: a systematic review and meta-analysis

BACKGROUND

Mifepristone and misoprostol are recommended for second-trimester medical abortion, but consensus is unclear on the ideal regimen.

OBJECTIVES

The objectives were to systematically review randomized controlled trials (RCTs) investigating efficacy, safety and satisfaction of medical abortion at ≥ 12 weeks' gestation.

DATA SOURCES

We searched PubMed, Popline, Embase, Global Index Medicus, Cochrane Controlled Register of Trials and International Clinical Trials Registry Platform from January 2008 to May 2017.

STUDY ELIGIBILITY PARTICIPANTS AND INTERVENTIONS

We included RCTs on medical abortion at ≥ 12 weeks' gestation using mifepristone and/or misoprostol. We excluded studies with spontaneous abortion, fetal demise and mechanical cervical ripening and those not reporting ongoing pregnancy (OP).

STUDY APPRAISAL AND SYNTHESIS METHODS

After extracting prespecified data and assessing risk of bias in accordance with the Cochrane handbook, we used Revman5 software to combine data and GRADE to assess certainty of evidence.

RESULTS

We included 43 of the 1894 references identified. Combination mifepristone-misoprostol had lower rates of OP [risk ratio (RR) 0.12, 95% confidence interval (CI) 0.04-0.35] vs. misoprostol only. A 24-h interval between mifepristone and misoprostol had lower OP rate at 24 h than simultaneous dosing (RR 3.13, 95% CI 1.23-7.94). Every 3-h dosing had lower OP rate at 48 h (RR 0.39, 95% CI 0.17-0.88).

LIMITATIONS

Direct comparisons of buccal misoprostol to sublingual or vaginal routes after mifepristone were limited. Evidence from clinical trials on how to best manage women with prior uterine incisions was lacking.

CONCLUSION

Our analysis supports the use of mifepristone 200 mg 1 to 2 days before misoprostol 400 mcg vaginally every 3 h at ≥ 12 weeks' gestation.

IMPLICATIONS

Where available, providers should use mifepristone plus misoprostol for second-trimester medical abortion. Vaginal misoprostol appears to be most efficacious with fewest side effects, but sublingual and buccal routes are also acceptable.

Current and potential methods for second trimester abortion

Medical and surgical methods can both be recommended for second trimester abortion (after 12-weeks of gestational age). Induced abortion with a mifepristone and misoprostol regimen is the preferred approach; where mifepristone is not available, misoprostol alone for medical abortion is also effective. Dilation and evacuation (D&E) is the procedure of choice for surgical abortions, and adequate cervical preparation contributes significantly to safety. Availability of drugs and instruments, ability to provide pain control, provider skill and comfort, client preference, cultural considerations, and local legislation all influence the method of abortion likely to be performed in a given setting. Both surgical and modern medical methods are safe and effective when provided by a trained, experienced provider.

Does feticide shorten termination duration in second trimester pregnancy terminations?

Backround

A retrospective (case-controlled) study was conducted with the aim of identifying the effect of the use of misoprostol on termination time in patients who did and did not undergo feticide procedures in second trimester pregnancy terminations.

Methods

The sampling of the study consisted of 144 pregnant women who were diagnosed as having major fetal anomalies incompatible with life, and were recommended for termination of pregnancy. The investigation showed that feticide procedures were performed for 99 women, and feticide procedures were not performed for 45 women. Misoprostol protocol was administered for 48 hours in the termination period; whether the feticide procedure directly affected the termination duration in patients who did and did not undergo feticide was evaluated.

Results

Abortion/birth was achieved in 103 (71.5%) women during the first 48 hours. There was no significant difference between the termination duration of the misoprostol protocol among the women who did and did not undergo feticide. There was no significant difference between the termination durations and fetal biometric measurements (BPD, HC) except head diameters (p=0.020 and p=0.015).

Conclusions

The misoprostol protocol is shown to be effective and safe for the termination of pregnancies during the second trimester. Feticide has no affect on the duration of termination.

Update on second trimester medical abortion

PURPOSE OF REVIEW

To review recent literature on second trimester abortion with medical methods.

RECENT FINDINGS

Across studies published in the recent past, it is apparent that women prefer shorter procedures and procedure times. Several randomized controlled trials have confirmed adding mifepristone to the second trimester medication abortion regimen results in shorter abortion intervals from first misoprostol administration to complete fetal expulsion. A study of simultaneous administration of mifepristone and misoprostol yielded shorter mean 'total' abortion times, presenting several logistical advantages. Recent studies on the continuous dosing of misoprostol have produced critical evidence to support continued dosing until expulsion. These studies had a more practical design compared with previous protocols that capped the number of misoprostol doses.

SUMMARY

Second trimester surgical abortion is well tolerated and increasingly expeditious. Further research is needed to refine second trimester medical abortion methods, specific to the mifepristone, misoprostol dosing interval. A 12-hour mifepristone to misoprostol interval may be the optimal interval balancing patient preferences and logistical considerations. Pragmatic dosing, including continuous dosing of misoprostol, could yield results that better inform clinical guidelines and reduce burden on patient, provider, and health facility.