Method of delivery of the nonvertex second twin: a community hospital experience.

The purpose of this study is to examine the incidence of cesarean section and fetal distress complicating the delivery of the second twin in vertex-nonvertex twin gestations in which the second twin underwent either breech extraction or external version. The intrapartum courses of 510 twin gestations delivered at a community hospital over a 10-year period were retrospectively analyzed. All vertex-nonvertex twin gestations were identified in which the second twin underwent attempted breech extraction or external version. Exclusion criteria included birthweight < or = 1,500 g, fetal anomaly, intrauterine demise, and monoamniotic twins. Of the 76 twin sets that met inclusion criteria, 33 underwent external version and 43 underwent primary breech extraction. The two groups had similar demographic characteristics. External version compared to breech extraction was associated with a significantly greater incidence of cesarean section (8/33 vs. 1/43, P = .008) and fetal distress (8/33 vs. 1/43, P = .008). There was no difference between groups in neonatal outcome for the second twin as measured by length of stay, 5-minute Apgar < 7, intensive care unit admissions, hyaline membrane disease, intraventricular hemorrhage, and traumatic birth injury. In conclusion, the increased incidence of cesarean section and fetal distress in patients undergoing attempted external version suggests that breech extraction may be the preferable route of delivery for the nonvertex second twin weighing more than 1,500 g.