Emergency cesarean delivery in induction of labor: an evaluation of risk factors.
BACKGROUND
Induction of labor has been associated with an increased risk of emergency cesarean delivery. Knowledge of factors that influence the risk of cesarean delivery in women with induced labor is limited.


METHODS
We performed a case-control study, nested within a population-based cohort of women with induced labor at term during 1991-1996 in Uppsala County, Sweden. Cases were women delivered with emergency cesarean delivery, and controls were women vaginally delivered (n = 193, respectively). Using logistic regression, analyses were performed. Odds ratio (OR) with 95% confidence intervals (CI) was used as a measure of relative risk.


RESULTS
Women with a previous cesarean delivery had high risks of cesarean delivery (adjusted OR = 10.10, 95% CI = 3.30-30.92). The risk of cesarean delivery was also increased among nulliparous (adjusted OR = 4.92, 95% CI = 2.81-8.61), short (adjusted OR = 2.20, 95% CI = 1.06-4.59), and obese women (adjusted OR = 2.03, 95% CI = 1.07-3.84). A cervix dilatation less than 1.5 cm doubled the risk of cesarean delivery (adjusted OR = 2.26, 95% CI = 1.09-4.66). Mother's age, epidural analgesia, oxytocin augmentation, gestational age, and birthweight were not significantly associated with risks of cesarean delivery.


CONCLUSIONS
Women with a previous cesarean delivery, nulliparous, short, and obese women with induced labor are at high risk of a cesarean delivery. When there is a need to deliver a woman with a previous cesarean section or a nulliparous woman with other risk factors for cesarean delivery, it may be prudent to consider an elective cesarean section.
Cnattingius
Ragnhild
R
Department of Women's and Children's Health, Obstetrics and Gynecology, Uppsala University Hospital, Uppsala, Sweden.
Höglund
Berit
B
Kieler
Helle
H
D000328:Adult; D016022:Case-Control Studies; D002585:Cesarean Section / Q000706:statistics & numerical data*; D015331:Cohort Studies; D004638:Emergency Treatment / Q000706:statistics & numerical data; D005260:Female; D006801:Humans; D007751:Labor, Induced / Q000009:adverse effects / Q000706:statistics & numerical data*; D016015:Logistic Models; D008427:Maternal Health Services / Q000706:statistics & numerical data; D016017:Odds Ratio; D011247:Pregnancy; D012042:Registries; D018570:Risk Assessment; D012307:Risk Factors; D013548:Sweden / Q000453:epidemiology