A prospective double-blinded, randomized, placebo-controlled trial on the use of letrozole pretreatment with misoprostol for second-trimester medical abortion.

摘要

BACKGROUND: The aim of this randomized trial was to evaluate the abortion rate of combined regimen of letrozole and misoprostol in second-trimester abortion. STUDY DESIGN: This was a randomized, double-blinded, placebo-controlled trial of 130 women requesting legal termination of pregnancy at gestational age between 12 and 20 weeks. Letrozole 7.5 mg or placebo were given for 3 days, followed by misoprostol 400 mcg vaginally every 3 h up to a maximum of five doses on the third day. RESULTS: The abortion rate in 24 and 48 h were similar for the letrozole and placebo groups (24 h: 93.8% vs. 90.8%, respectively, p=.718; 48 h: 98.5% vs. 95.4%, respectively, p=.496). The median induction-to-abortion interval was also similar for the letrozole and placebo groups (9.6 h vs. 10.6 h, p=.145). All the side effects were comparable between the two groups. CONCLUSION: The use of letrozole pretreatment (7.5 mg daily for 3 days) with misoprostol in second-trimester abortion does not significantly improve the abortion rate of the misoprostol-only regimen.