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J Obstet Gynaecol Res. 2003 Apr;29(2):104-8.

Use of fetal-pelvic index in the prediction of vaginal birth following previous cesarean section.

Author information

1
Department of Obstetrics and Gynecology, Kwong Wah Hospital, Kowloon, Hong Kong SAR, China. cw1wong@netvigator.com

Abstract

AIM:

To clarify the usefulness of the fetal-pelvic index as a predictor of vaginal birth after previous lower segment cesarean section.

METHODS:

One hundred and seventy women with one lower segment cesarean section who attempted for trial of vaginal birth were enrolled. Pelvimetry was performed to measure maternal pelvic inlet and mid-cavity circumferences at 37 weeks gestation. Ultrasound was performed to measure fetal head and abdominal circumferences at 38-39 weeks. The fetal-pelvic index was derived. The predictability of fetal-pelvic index in the predicting the outcome of delivery was calculated.

RESULTS:

Fifty-seven (33.5%) women required repeated cesarean section and 113 (66.5%) delivered vaginally. Twenty-two women with positive fetal-pelvic index had repeated cesarean section. The predictability of positive fetal-pelvic index was 48.9%. Ninety of the 125 patients with a negative fetal-pelvic index delivered vaginally. The predictability of negative fetal-pelvic index was 72.0%.

CONCLUSIONS:

Fetal-pelvic index derived in the antenatal period has low predictive value in predicting of successful vaginal birth after cesarean section. This index is not useful in clinical practice.

PMID:
12755531
[Indexed for MEDLINE]

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