Neonatal hypoglycaemia in infants of diabetic mothers.
OBJECTIVE
To determine whether umbilical cord blood glucose correlates with subsequent hypoglycaemia after birth in infants of well-controlled diabetic mothers.


METHODS
Thirty-eight term infants of well-controlled diabetic mothers were enrolled. Five mothers had pre-existing diabetes. Of the 33 gestational diabetic mothers, 16 were managed on insulin and 17 on diet. Maternal blood glucose was maintained between 4 and 8 mmol/L during labour and delivery. Infants' plasma glucose levels were measured from venous cord blood and serially, at less than 30 min, 1 h and 2 h of life by glucose hexokinase method. Blood glucose levels were further monitored by bedside Dextrostix for 24 h.


RESULTS
Eighteen (47%) infants developed hypoglycaemia (blood glucose level less than 2 mmol/L) during the first 2 h of life. There was no difference in the cord blood glucose levels between infants with or without hypoglycaemia (3.7 +/- 1.1 vs 4.5 +/- 1.1 mmol/L, respectively). Infants of mothers with diabetes diagnosed prior to 28 weeks gestation were at a higher risk of developing hypoglycaemia (8 of 10 vs 10 of 28, OR 7.2, 95%CI 1.3-40.7). Hypoglycaemic infants were of significantly higher birthweight, and were more likely to be born to Caucasian mothers and by Caesarean section. Raised maternal fructosamine blood level, the need for insulin treatment or the infant's haematocrit were not different between infants with or without hypoglycaemia.


CONCLUSIONS
In well-controlled diabetic mothers, the incidence of early hypoglycaemia in infants is still high, particularly in those mothers who had a longer duration of diabetes. Cord blood glucose level did not identify the infants with hypoglycaemia.
Department of Newborn Care, Royal Hospital for Women, Randwick and School of Paediatrics, University of New South Wales, Sydney, Australia.
R K
RK
Agrawal
K
K
Lui
J M
JM
Gupta
D001724:Birth Weight; D001786:Blood Glucose / Q000032:analysis*; D016640:Diabetes, Gestational; D005260:Female; D005312:Fetal Blood; D006801:Humans; D007003:Hypoglycemia / Q000175:diagnosis*; D007231:Infant, Newborn; D011247:Pregnancy; D011254:Pregnancy in Diabetics
D001786:Blood Glucose