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Prediction of cesarean delivery using the fetal-pelvic index.

Abstract：

OBJECTIVE:The purpose of this study was to estimate the usefulness of the fetal-pelvic index (FPI) in the prediction of cesarean delivery among nulliparous and women who undergo a trial of labor after cesarean delivery (TOLAC). STUDY DESIGN:This prospective cohort study included subjects at 2 hospitals from the University of Pennsylvania Health system. The study sample included nulliparous women and women who attempted TOLAC, with nonanomalous pregnancies at ≥37 weeks of gestation in vertex presentation (n = 221 and 207, respectively). FPI score was calculated with the ultrasound-based fetal biometric measures that were performed within 2 weeks of delivery and x-ray pelvimetry that was performed within 48 hours of delivery. Multivariable logistic regression was used to develop a clinical predictive index for cesarean delivery, which included FPI and clinical factors, in nulliparous women or women who attempted TOLAC. The prediction models were tested for accuracy with the area under the receiver operating characteristics curve. RESULTS:Higher FPI scores were associated with greater odds of cesarean delivery. A unit increase in FPI score increased the odds of cesarean delivery by 15% (adjusted odds ratio, 1.15; 95% confidence interval, 1.09-1.21) for nulliparous women and 15% for women who attempted TOLAC (adjusted odds ratio, 1.15; 95% confidence interval, 1.10-1.20) after adjustment for maternal age, race, medical risk factors, and labor method. Among nulliparous women, the receiver operating characteristics analysis estimated an area under the curve of 0.88, with positive and negative predictive values of 76% and 87%, respectively. Similar findings were observed in the subgroup of women who attempted TOLAC. CONCLUSION:The FPI when combined with clinical risk factors can identify accurately women who are at a high risk for cesarean delivery.

journal_name

Am J Obstet Gynecol

journal_title

American journal of obstetrics and gynecology

authors

Macones GA,Chang JJ,Stamilio DM,Odibo AO,Wang J,Cahill AG

doi

10.1016/j.ajog.2013.06.026

keywords:

["cesarean delivery","fetal pelvic index","prediction","trial of labor after cesarean delivery"]

subject

Has Abstract

pub_date

2013-11-01 00:00:00

pages

431.e1-8

issue

eissn

0002-9378

issn

1097-6868

pii

S0002-9378(13)00642-X

journal_volume

209

pub_type

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Prediction of cesarean delivery using the fetal-pelvic index.