Medication abortion failure in women with and without previous cesarean delivery

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• 作者：Christine E. Dehlendorf^a ; ^b ; ^c ; ^{christine.dehlendorf@ucsf.edu" class="auth_mail" title="E-mail the corresponding author} ; Edith E. Fox^a ; Rose F. Ali^d ; Nora C. Anderson^a ; Reiley D. Reed^a ; E. Steve Lichtenberg^d ; ^e
• 关键词：Abortion ; Medication abortion ; Failure ; Cesarean ; Parity
• 刊名：Contraception
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：92
• 期：5
• 页码：463-468
• 全文大小：152 K

文摘

To investigate the association between previous cesarean delivery and medication abortion failure and the association between parity and failure.

Methods

Data were abstracted from 2035 consecutive charts of women who underwent medication abortion in 2011. All women were at 63 days gestation or less and received mifepristone 200 mg orally and misoprostol 800 mcg buccally. We used multivariate logistic regression to assess the relationship between failure, defined as requiring either curettage or additional medication, and prior cesarean delivery. We also examined the relationship between failure and parity.

Results

Follow-up was available on 1609 (79%) patients. Overall, 4.5% of patients experienced failure. Neither cesarean delivery nor parity was associated with failure; 6.5% of women with prior cesarean delivery experienced failure, compared to 3.7% of nulliparous women [adjusted odds ratio (aOR), 1.79, 95% confidence interval (CI), 0.83–3.87]. With regard to parity, 4.7% of women with two or more previous births experienced failure, compared to 3.7% of nulliparous women (aOR, 1.07, 95% CI, 0.54–2.14).

Conclusion

We did not find significant associations between prior cesarean delivery and failure or parity and failure. A previous study of patients who had received a less effective regimen reported significant associations between cesarean delivery and failure and parity and failure. While our results do not rule out the possibility of modest associations due to our limited statistical power, they are reassuring relative to previous findings.

Implications

Our results suggest that if there are differences in women's odds of medication abortion failure by obstetric history, such differences are unlikely to be large. Providers and patients may factor this information into decision making about methods of pregnancy termination.