Perinatal management and problems of preterm twins less than 32 weeks of gestation in Japan.

Between 1983 and 1998 there were 23433 births at Kitasato University Hospital, including 359 births. A retrospective analysis was performed on 320 twin pairs analyzing survivability indexes with respect to fetal age, chorionicity and birth weight discordance. Furthermore, the paper illustrates an analysis of causes of neonatal deaths as well as the rate of various complications of twins delivered before 32 weeks gestation such as twin-twin transfusion syndrome and periventricular leukomalacia.