Medical versus surgical methods for first trimester termination of pregnancy: Cochrane systematic review

Abstract

Assessed as up to date: 2009/12/14

Background

Induced abortions are very commonly practiced interventions worldwide. A variety of medical abortion methods have been introduced during the last decade in addition to existing surgical methods. In this review we systematically searched for and combined all evidence from randomised controlled trials comparing surgical with medical abortion.

Objectives

To evaluate medical methods in comparison to surgical methods for first-trimester abortion with respect to efficacy, side effects and acceptability.

Search strategy

The Cochrane Controlled Trials Register, MEDLINE (with the Cochrane 3-stage search strategy;1966-2000) and Popline (1970-2000) were systematically searched. There were no language preferences in searching. Reference lists of retrieved papers were searched. Experts in WHO/HRP were contacted.

Selection criteria

Randomised trials of any surgical abortion method compared with any medical abortion method in the first trimester.

Data collection and analysis

Trial quality was assessed and data extraction was made independently by two reviewers.

Main results

Seven studies mostly with small sample sizes, comparing 4 different interventions (prostaglandins alone, mifepristone alone, and mifepristone/misoprostol and methotrexate/misoprostol versus vacuum aspiration) were included. Results are sometimes based on one trial only. Prostaglandins vs vacuum aspiration: the rate of abortions not completed with the intended method was statistically significant higher in the prostaglandin group (2.7, 95% CI 1.1 to 6.8) compared to surgery. There are no data on the most commonly medical (mifepristone/misoprostol) and surgical abortion available to be included in the review. Duration of bleeding was longer in the medical abortion groups compared to vacuum aspiration. There was only one major complication (uterine perforation) in one trial in the surgical group. There was no difference between the groups for ongoing pregnancies at the time of follow-up or pelvic infections. No data on acceptability, side effects or women's satisfaction with the procedure were availbale for inclusion in the review.

Authors' conclusions

The results are derived from relatively small trials. Prostaglandins used alone seems to be less effective and more painful compared to surgical first-trimester abortion. However, there is inadequate evidence to comment on the acceptability and side effects of medical compared to surgical first-trimester abortions. There is a need for trials to address the efficacy of currently used methods and women's preferences more reliably.

Author(s)

Say Lale, Brahmi Dalia, Kulier Regina, Campana Aldo, Gülmezoglu A Metin

Summary

Medical methods for early termination of pregnancy can be safe and effective.

There are several different surgical techniques for early termination of pregnancy (abortion in the first three months). Several drugs can also be prescribed alone or in combination to terminate early pregnancy. This is called medical abortion, and uses the hormones prostaglandins and/or mifepristone (an antiprogesterone often called RU486), and/or methotrexate. The review of trials found that medical methods for abortion in early pregnancy can be safe and effective, with the most evidence of effectiveness for a combination of mifepristone and misoprostol (a prostaglandin). Almost all of the trials were done in well-resourced hospitals where women returned for check-up.

Reviewer's Conclusions

Implications for practice

Prostaglandin used alone seems to be less effective and more painful compared to vacuum aspiration for first-trimester abortion. Duration of bleeding seems to be longer with medical methods and women should therefore be counselled accordingly. Also, medical methods may be more painful.

Implications for research

The trials included have small sample sizes. There is a need for trials to address the efficacy, especially of currently used methods, and women's preferences more reliably.

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TY - ELEC T1 - Medical versus surgical methods for first trimester termination of pregnancy: Cochrane systematic review ID - 432392 BT - Cochrane Abstracts UR - https://evidence.unboundmedicine.com/evidence/view/Cochrane/432392/all/Medical_versus_surgical_methods_for_first_trimester_termination_of_pregnancy:_Cochrane_systematic_review DB - Evidence Central DP - Unbound Medicine ER -