[Changes in the criteria for planned delivery in the National Defense Medical College Hospital with statistical analysis].

Planned deliveries have been attempted with the administration of prostaglandins E2 and F2 alpha since 1978. Eight hundred and eighteen prostaglandins-induced and 729 uninduced deliveries from January, 1978 to July, 1980 were statistically analyzed. The uninduced deliveries included 465 spontaneous and 264 stimulated labors. The cervical ripening was considered the basic requirement stimulated labors. The cervical ripening was considered the basic requirement for labor induction for the first year of study. However, spontaneous labor onset or the membranes rupture occurred before the induction in 52.4% of cases, where babies were large enough (3,052.6 +/- 33.4g, mean +/- SE, n = 154). Therefore, the cervical factor was excluded from the essential requirement for induction. Since the beginning of 1979, labor induction has been performed based on gestational age (38 weeks or more) and uterine fundal length (32cm or more). Laminaria tents were inserted into the unfavorable cervix the night before induction. Delivery time in the day, duration of labor, and birth weight of babies in the induced group were 2.04 +/- 0.18 p.m., 8.0 +/- 0.3 hours and 3,138.8 +/- 12.3g, respectively. Apgar scores and the amount of postpartum hemorrhage were not significantly different from those in the uninduced group. Similar results were obtained between the laminaria subgroup with unfavorable cervix and the non-laminaria subgroup with ripe cervix in the induced primigravidas.