Little is known of the ability of the human newborn infant to mount an endocrine and metabolic response to surgical trauma. Blood concentrations of glucose, lactate, pyruvate, alanine, hydroxybutyrate, acetoacetate, and glycerol together with plasma concentrations of insulin, glucagon, adrenaline, and nonadrenaline were measured in 33 infants (26 term, 7 preterm) subjected to surgery during the neonatal period. The results show that newborn infants can indeed mount a substantial endocrine and metabolic stress response, the main features of which are hyperglycemia and hyperlactatemia associated with the release of catecholamines and the inhibition of insulin secretion. There are specific differences between preterm and term neonates and between neonates anesthetised by different anesthetic techniques in the pattern of this response.

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