Perinatal and maternal outcomes of fetal macrosomia

To determine the perinatal and maternal outcome of the macrosomic infants.

A case-control, retrospective study is performed in the Department of Gynecology and Obstetrics, Istanbul University Cerrahpasa Medical Faculty, between 1988-1992. The maternal and neonatal records of infants with birthweight of at least 4000g (n=1000) were reviewed. Another 1000 cases amongst the newborns delivered in the same period between 2500 and 3999g formed the control group. The obstetrical outcome variables of the groups including mode of delivery and the incidence of maternal and perinatal complications were compared.

A total of 16,112 deliveries occurred during the study period. The rate of macrosomic deliveries was 6.21% and the rate of the deliveries (4500g or heavier) was 1.04%. The mean birthweight of the study group was 4272+/-239 and 3277+/-316g of the control group (P<0.001). While the cesarean section rate was 28.8% for the study group and it was 16.6% for the control group (P<0.001). In the study group, 17 cases of brachial plexus palsy (2.4%), 16 cases of clavicular fracture (2.3%) and one case of humeral fracture were observed (P<0.001). The rate of perinatal mortality was 0.8% in the study group. No perinatal mortality was recorded in the control group. There were 14 cases (1.4%)of asphyxia related to delivery in the study group (P<0.01). The rate of maternal complications, were significantly higher in the study group (P<0.01).

The macrosomic infants are in increased risk for birth trauma and asphyxia. The risk of birth trauma for the infants weighing 4500g or more is even greater.