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Medical abortion. defining success and categorizing failures
Christina Rørbye1, Mogens Nørgaard, Vibeke Vestermark
1Department of Obstetrics and Gynecology, H:S Hvidovre Hospital, University of Copenhagen, Kettegaard Alle 30, 2650 Hvidovre, Denmark. christina.roerbye@hh.hosp.dk
Contraception
|October 24, 2003
Summary
Medical abortion success rates, defined as no surgery, decreased over time, especially with later gestational ages. Early follow-up indicators like endometrial width and beta-hCG levels can predict medical abortion outcomes.
Area of Science:
- Reproductive Medicine
- Pharmacology
Background:
- Medical abortion is a common alternative to surgical procedures for pregnancy termination.
- Understanding factors influencing medical abortion success is crucial for patient care and regimen optimization.
Purpose of the Study:
- To evaluate the success rates of a specific medical abortion regimen (mifepristone followed by gemeprost) over time.
- To identify predictors of medical abortion failure.
- To propose standardized methods for comparing medical abortion regimen success rates.
Main Methods:
- A cohort of 461 women underwent medical abortion using mifepristone (600 mg) followed by gemeprost (1 mg vaginally) within 63 days of gestational age.
- Success was defined as the absence of surgical intervention.
- Follow-up assessments were conducted at 2 weeks and 15 weeks post-initiation.
Main Results:
- Overall success rate declined from 98.7% at 2 weeks to 94.6% at 15 weeks.
- Failure rates increased with advancing gestational age.
- A significant proportion of failures (76%) were diagnosed beyond the 2-week mark.
- Women experiencing failure showed larger endometrial width, higher beta-hCG levels, and smaller beta-hCG reductions at 2-week follow-up compared to successful cases.
Conclusions:
- The success of this medical abortion regimen decreases over time, with a notable increase in failures diagnosed after the initial 2-week follow-up.
- Gestational age significantly impacts success rates, with later gestations experiencing lower success.
- Standardized reporting of success criteria, stratification by gestational age, and categorization of secondary intervention indications are recommended for comparative studies.