Sp. Ionides et al., PLASMA BETA-ENDORPHIN CONCENTRATIONS AND ANALGESIA MUSCLE-RELAXATION IN THE NEWBORN-INFANT SUPPORTED BY MECHANICAL VENTILATION, The Journal of pediatrics, 125(1), 1994, pp. 113-116
We evaluated the effects of pancuronium and opiates on plasma a-endorp
hin concentrations in 25 infants supported by mechanical ventilation.
Infants receiving opiate were randomly assigned to receive either fent
anyl or morphine. There was no change in beta-endorphin concentrations
after administration of pancuronium, whereas both fentanyl and morphi
ne reduced a-endorphin concentrations by approximately 60%.