Background: The study was conducted to assess the effectiveness of early medical abortion (EMA) in women with early pregnancy and no defined intrauterine gestational sac (IUGS) on ultrasound.
Study design: Retrospective, multicenter, observational study of oral mifepristone 200 mg and buccal misoprostol 800 mcg administered 24-48 h later for EMA (gestations ≤ 63 days). Odds ratios (ORs) [95% confidence intervals (CIs)] of EMA failure and continuing pregnancy for women with no defined IUGS vs. those with confirmed IUGS were calculated.
Results: Women with no defined IUGS were more likely to experience EMA failure [9.0% (6/67) vs. 3.5% (465/13,345); OR (95% CI)=2.72 (1.17-6.33), p=.041] and continuing pregnancy [7.5% (5/67) vs. 0.6% (83/13,345); OR (95% CI)=12.72 (4.98-32.46), p<.001].
Conclusion: EMA failure is more likely in women with early pregnancy and no defined IUGS than those with gestations ≤ 63 days and confirmed IUGS.
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