Oxygen consumption and resting energy expenditure during phototherapy in full term and preterm newborn infants
T F Fok, J-S Gu, C N Lim, P C Ng, H L Wong, K W So
Department of
Paediatrics, Prince of Wales Hospital, The Chinese University of Hong
Kong, Shatin, Hong Kong
Correspondence to: Dr Fok taifaifok{at}cuhk.edu.hk
Accepted 8 March 2001
OBJECTIVES
To
determine the effect of phototherapy on the oxygen consumption and
resting energy expenditure of term and preterm newborn infants.
METHODSA total of 202 infants (gestation 30-42 weeks; body weight 1270-4100 g) requiring
phototherapy for the treatment of neonatal hyperbilirubinaemia were
enrolled in a randomised crossover study. In random sequence, the
oxygen consumption and resting energy expenditure were measured twice
in each infant by indirect calorimetry, once at the end of six hours of
continuous phototherapy and once after a control period of at least six
hours without phototherapy. Anterior abdominal wall temperature was
servocontrolled at 36.5°C throughout the study.
RESULTSAt the end of
six hours of continuous phototherapy, oxygen consumption (mean (SD):
6.21 (1.35) v 6.26 (1.51) ml/kg,
p = 0.555) and resting energy expenditure (178.11 (37.62)
v 180.37 (43.14) kJ/kg/24 h, p = 0.382)
did not differ significantly from those measured after the control
period. There were also no significant differences in heart rate,
respiratory rate, or rectal temperature. Subgroup analysis of those of
gestation < 37 weeks or < 34 weeks also showed no effect of
phototherapy on either oxygen consumption or resting energy expenditure.
CONCLUSIONPhototherapy
has no effect on the metabolic rate of thermally stable term or preterm infants.
Keywords: phototherapy; oxygen consumption; resting energy expenditure; preterm
© 2001 by Archives of Disease in Childhood
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