OBSTETRICS Parameters Associated With Outcome in Third

Objective: To assess parameters associated with perinatal and neonatal morbidity and mortality in monochorionic (MC) diamniotic twin pregnancies after 25 weeks of gestation. Methods: Neonatal outcomes after 25 weeks ’ gestational age were retrieved for all twin pregnancies between the years 2001 and 2007 and documented according to chorionicity. The features of MC pregnancies that resulted in intrauterine or neonatal demise were reviewed carefully to find an explanation for the adverse outcome. Results: The features of 93 pairs of MC twins were recorded and compared with those of 428 consecutive pairs of dichorionic (DC) twins. Perinatal mortality was higher in the MC twin pregnancies (1.61 % vs. 0.35%, P = 0.04). Average gestational age at delivery (34.8 vs. 35.9 weeks, P < 0.001), mean birth weight (2127 g vs