RT Journal Article
SR Electronic
T1 Gluconeogenesis continues in premature infants receiving total parenteral nutrition
JF Archives of Disease in Childhood - Fetal and Neonatal Edition
JO Arch Dis Child Fetal Neonatal Ed
FD BMJ Publishing Group Ltd and Royal College of Paediatrics and Child Health
SP F413
OP F418
DO 10.1136/adc.2009.178020
VO 95
IS 6
A1 Shaji K Chacko
A1 Agneta L Sunehag
YR 2010
UL http://fn.bmj.com/content/95/6/F413.abstract
AB Objective To determine the contribution of total gluconeogenesis to glucose production in preterm infants receiving total parenteral nutrition (TPN) providing glucose exceeding normal infant glucose turnover rates. Study Design Eight infants (0.955±0.066 kg, 26.5±0.5 weeks, 4±1 days) were studied while receiving routine TPN. The glucose appearance rate (the sum of rates of glucose infusion and residual glucose production) and gluconeogenesis were measured by stable isotope–gas chromatography–mass spectrometry techniques using deuterated water and applying the Chacko and Landau methods. Results Blood glucose ranged from 5.2 to 14.3 mmol/l (94–257 mg/dl) and the glucose infusion rate from 7.4 to 11.4 mg/kg per min, thus exceeding the normal glucose production rates (GPR) of newborn infants in most of the babies. The glucose appearance rate was 12.4±0.6 and GPR 2.1±0.3 mg/kg per min. Gluconeogenesis as a fraction of the glucose appearance rate was 11.2±1.1% (Chacko) and 10.5±1.2% (Landau) (NS) and the rate of gluconeogenesis was 1.35±0.15 mg/kg per min (Chacko) and 1.29±0.14 mg/kg per min (Landau) (NS). Gluconeogenesis accounted for 73±11% and 68±10 (NS) of the GPR for the two methods, respectively. Gluconeogenesis and glycogenolysis were not affected by the total glucose infusion rate, glucose concentration, gestational age or birth weight. Glucose concentration correlated with the total glucose infusion rate and gestational age (combined R2=0.79, p=0.02). Conclusions Gluconeogenesis is sustained in preterm infants receiving routine TPN providing glucose at rates exceeding normal infant glucose turnover rates and accounts for the major part of residual glucose production. Gluconeogenesis is not affected by the glucose infusion rate or blood glucose concentration.