We report on the perioperative management of anesthesia and analgesia in a child with sickle cell disease and a congenital myopathy, presenting for corrective orthopedic surgery. The case illustrates two valuable points of interest: the many benefits of regional anesthesia in complex medical cases and the successful use of tourniquets in children with sickle cell disease.
The concentrations required for the effects on amplitude are much higher (33 fold) than the clinically relevant plasma concentrations of these drugs after epidural administration, and are unlikely to be significant in the setting of low-dose epidural analgesia in labor.
The venous lactate reference range for the non-pregnant adult may be applied in pregnancy. Further studies should examine lactate dynamics in labor and postpartum.
TitleOpioid mediated activity and expression of mu and delta opioid receptors in isolated human term non-laboring myometrium
AbstractThe existence of opioid receptors in mammalian myometrial tissue is now widely accepted. Previously enkephalin degrading enzymes have been shown to be elevated in pregnant rat uterus and a met-enkephalin analogue has been shown to alter spontaneous contractility of rat myometrium. Here we have undertaken studies to determine the effects of met-enkephalin on in vitro human myometrial contractility and investigate the expression of opioid receptors in pregnant myometrium. Myometrial biopsies were taken from women undergoing elective caesarean delivery at term. Organ bath experiments were used to investigate the effect of the met-enkephalin analogue [D-Ala 2, D-met 5] enkephalin (DAMEA) on spontaneous contractility. A confocal immunofluorescent technique and real time PCR were used to determine the expression of protein and mRNA respectively for two opioid receptor subtypes, mu and delta. DAMEA had a concentration dependent inhibitory effect on contractile activity (1X10 -7 M to 1X10 -4 M; 54% reduction in contractile activity, P<0.001 at 1X10 -4 M concentration). Mu and delta opioid receptor protein sub-types and their respective mRNA were identified in all tissues sampled. This is the first report of opioid receptor expression and of an opioid mediated uterorelaxant action in term human non-laboring myometrium in vitro.
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