Background Medical termination of pregnancy can be successfullyperformed with a combination of mifepristone (RU 486) and aprostaglandin analogue. We conducted a prospective, randomizedtrial to compare oral with vaginal administration of the prostaglandinE1 analogue misoprostol for first-trimester abortion in womentreated initially with mifepristone.
Methods The study population consisted of 270 women seekingabortion within 63 days after the onset of amenorrhea. The doseof mifepristone was 600 mg, and the dose of misoprostol was800 µg. The study had two primary end points: expulsionof the conceptus without the need for a surgical procedure,and abortion within four hours after the administration of misoprostol.
Results Expulsion of the conceptus without the need for a surgicalprocedure occurred in 95 percent of the women who received misoprostolvaginally and in 87 percent of those who received it orally(P = 0.03). The rate of continued pregnancy was 7 percent withthe oral regimen and 1 percent with the vaginal regimen (P =0.01). Ninety-three percent of the women receiving misoprostolvaginally had abortions within four hours, as compared withonly 78 percent of the women receiving the drug orally (P<0.001).Vomiting and diarrhea were reported more frequently by the womenwho received oral misoprostol than by those who received vaginalmisoprostol (P = 0.04 and P = 0.002, respectively).
Conclusions After the administration of mifepristone, vaginaladministration of misoprostol is more effective and better toleratedthan oral administration for the induction of first-trimesterabortion.
Source Information
From the Department of Obstetrics and Gynaecology (H.E.-R., D.R., L.C., A.T.) and the Health Service Research Unit (M.A.), Medical School, Aberdeen, Scotland, United Kingdom.
Address reprint requests to Dr. El-Refaey at the Obstetric Hospital, University College Hospital, Huntly St., London WC1E 6AU, United Kingdom.
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