Abstract

The benefits of X-ray pelvimetry and electronic monitoring of fetal heart rate and intra-uterine pressure were studied prospectively in order to predict the likelihood of a successful vaginal birth after previous cesarean section (CS). In 1982, a total of 369 parturients (7% of all deliveries) who had previously undergone CS were studied. Trial of labor (TL) was allowed in 160 cases (43.4%) and planned repeat CS was performed in 209 patients (56.6%). Patients in the TL group were compared with a matched control group. One hundred and fifty patients (94%) in the TL group gave birth by the vaginal route. There were no differences in the duration of the first and second stage of labor, duration of ruptured membranes (ROM), maternal blood loss or the incidence of CS and vacuum extraction between the TL group and the control group. Rates of low Apgar score (less than 7) at 1 and 5 min were the same in both groups. Intensive fetal monitoring during the course of labor, together with X-ray pelvimetry in selected cases, markedly reduced the incidence of acute repeat CS with no change in the overall rate of successful vaginal delivery compared with our previous results.

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