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Predictive score for vaginal birth after cesarean section

D Weinstein¹, A Benshushan, V Tanos

¹Department of Obstetrics and Gynecology, Hadassah Hebrew University Medical Center, Jerusalem, Israel.

American Journal of Obstetrics and Gynecology

|January 1, 1996

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A trial of labor after one cesarean delivery is successful for most women. Key predictors of success include prior vaginal birth and a Bishop score of 4 or higher, aiding in a new predictive score.

Area of Science:

Obstetrics and Gynecology
Reproductive Medicine
Maternal-Fetal Medicine

Background:

Vaginal birth after cesarean delivery (VBAC) is a significant clinical consideration.
Identifying factors predicting VBAC success is crucial for patient counseling and clinical decision-making.

Purpose of the Study:

To evaluate the relative importance of various factors influencing the success of a trial of labor after a previous cesarean delivery.
To develop a predictive scoring system for VBAC success.

Main Methods:

Retrospective study of 471 women attempting VBAC over a 10-year period (1981-1990).
Analysis of delivery outcomes and identification of prognostic factors for VBAC success.

Main Results:

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VBAC was successful in 78.1% of women.
Significant predictors of success included prior vaginal birth (OR 1.8), malpresentation (OR 1.9), pregnancy-induced hypertension (OR 2.3), and Bishop score ≥ 4 (OR 6.0).
Macrosomia (OR 0.2) and intrauterine growth retardation decreased success rates, while maternal age and indications like cephalopelvic disproportion/failure to progress had no significant predictive value.

Conclusions:

VBAC should be encouraged for most women without obstetric contraindications.
A proposed scoring system can help identify women with a higher likelihood of successful VBAC.