Uterine leiomyoma among women who conceived following fertility treatment.

Objective: The objective was to determine if uterine leiomyoma increases the risk of cesarean section (CS) among women who conceived following fertility treatment.

Study Design: The study population consisted of all women who conceived after fertility treatment with singleton gestation and who delivered between the years 1988 and 1999 in the Soroka University Medical Center. A comparison was performed between patients with and without uterine leiomyomas. The Mantel-Haenszel procedure was used to obtain the weighted odds ratio (OR) for CS, while controlling for confounding variables.

Results: During the study period 1,995 women conceived following fertility treatment. Of these, 63 patients had uterine leiomyomas (3.2%). Women treated for fertility with uterine leiomyomas had statistically significant higher rates of CS than those without uterine leiomyomas (61.9% vs. 28.1%, OR=4.2, 95% CI 2.4-7.2; P<0.001). Stratified analysis (the Mantel-Haenszel technique) was used to control for possible confounders, such as gestational diabetes, hypertensive disorders, maternal age, failure of labor to progress, placental abruption, malpresentation, hydramnios, oligohydramnios, and a previous CS. None of those variables changed the significant association or explained the higher incidence of CS in the uterine leiomyoma group.

Conclusions: Uterine leiomyoma is an independent risk factor for CS among women who conceived following fertility treatment.