Plasma Noradrenaline and Adrenaline in Infants of Diabetic Mothers at Birth and at Two Hours of Age

Plasma noradrenaline and adrenaline in the umbilical artery were very high in many infants of both diabetic mothers (IDM) and non-diabetic mothers (controls) compared to values obtained in adults. Blood pH was slightly but significantly lower in IDM than in controls at delivery. There was a significant negative correlation between plasma noradrenaline and blood pH in IDM at birth, but no correlation between plasma noradrenaline and blood glucose, birth weight and Apgar scores. Plasma noradrenaline decreased significantly from birth to two hours of age both in IDM and controls. At two hours of age plasma noradrenaline and adrenaline were significantly greater in IDM compared to controls whereas blood glucose concentration was lower in the former group. There was a close inverse correlation between plasma noradrenaline and adrenaline, respectively, and blood glucose in IDM at two hours of age but not in controls. The elevated plasma noradrenaline at delivery in IDM may be explained by clinically undetectable acidosis whereas elevated plasma catecholamines at two hours are probably due to hypoglycaemia.