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Henci GoerFind out what other moms-to-be are asking.  Join in the discussion with Henci Goer, an expert in obstetric research. If you would like to contact Henci outside of the Ask Henci forum, send an email to Goersitemail@aol.com.

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Reply To Topic Topic: VBAC after 2 emergency c-sections
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Posted By Henci Goer, BA on 04 Nov 2009 11:20 PM

Here is the answer to your question. I can't help adding that your question justifies the work I put into achieving my goal for this chapter, which was to supply specific data for decision making as opposed to the more usual vague generalities of "increased" or even "slightly increased" risk.  If you experienced placenta previa (placenta covering the cervix) or accreta (placenta growing into the uterine muscle, you would definitely need another cesarean.

-- Henci

Excerpt from the manuscript of the VBAC chapter for the second edition of Obstetric Myths Versus Research Realities to be published by University of Michigan Press.

 

Two studies reported an increase in placenta previa with increasing number of prior cesareans. The first, of 31,102 women, reported a rate of 3-4 per 1000 with 0-1 prior cesareans and 7 per 1000 with 2 prior cesareans (Getahun 2006). The second, of 155,670 women, reported 3 per 1000 with 0 prior cesareans, 8 per 1000 with 1 prior cesarean, 20 per 1000 with 2 prior cesareans, and 42 per 1000 with ≥ 3 prior cesareans (Miller 1997). . . . The risk of placenta accreta also increases with accumulation of cesarean surgeries. A study of 30,100 nonlabor cesareans reported an accreta rate of 2-3 per 1000 with 0 or 1 prior cesarean, 6 per 1000 with 2 prior cesareans, 21 per 1000 with 3 prior cesareans, 23 per 1000 with 4 prior cesareans, and 67 per 1000 with ³ 5 prior cesareans (Silver 2006).

 

Getahun D, Oyelese Y, Salihu HM, et al. Previous cesarean delivery and risks of placenta previa and placental abruption. Obstet Gynecol 2006;107(4):771-8.

 

Miller DA, Chollet JA, Goodwin TM. Clinical risk factors for placenta previa-placenta accreta. Am J Obstet Gynecol 1997;177(1):210-4.

 

Silver RM, Landon MB, Rouse DJ, et al. Maternal morbidity associated with multiple repeat cesarean deliveries. Obstet Gynecol 2006;107(6):1226-32.

 

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