title: Monoamniotic twin pregnancy.
abstract: The course and outcome of 23 monoamniotic (MA) twin pregnancies, delivered in Tampere University Central Hospital during the years 1964-1984, were studied retrospectively and compared to 1056 diamniotic (DA) twin pregnancies. The frequency of MA twins was 2.1% of twin pregnancies. Polyhydramnion complicated the pregnancy in 26% of MA vs 6% of DA pregnancies. Two cases were defined as acute polyhydramnion. Preterm labour was stated in 70% of MA pregnancies and deliveries before the 34th week were 4 times more common in MA than DA pregnancies. The cesarean section rate was more than double in MA pregnancies (39%). Entanglement of the umbilical cords was noted four times, and prolapse of the cord in three vaginally delivered cases. Perinatal mortality was 28% in MA vs 5% in DA twins. The most common causes of death were respiratory distress syndrome, congenital malformation and feto-fetal transfusion.
mesh_terms: D000650:Amnion / Q000033:anatomy & histology*; D000013:Congenital Abnormalities; D005314:Embryonic and Fetal Development; D005260:Female; D005313:Fetal Death; D006801:Humans; D008297:Male; D011247:Pregnancy; D011248:Pregnancy Complications; D011272:Pregnancy, Multiple; D012189:Retrospective Studies; D014427:Twins