ISSN:
1432-1041
Keywords:
hypothermia
;
fentanyl
;
pharmacokinetics
;
cardiopulmonary bypass
;
hypothermia-induced hypoperfusion
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Medicine
Notes:
Summary The effect of hypothermia on the disposition of fentanyl was evaluated in 18 children undergoing corrective cardiac surgery. They received a bolus of fentanyl followed by a continuous infusion which was stopped when cardiopulmonary bypass was established and profound hypothermia was achieved (18 °C–25 °C). Fentanyl plasma concentration remained essentially unchanged during hypothermia (6.45 ng/ml 5 min into hypothermia and 5.26 ng/ml 100–140 min later; p〉0.1). In subsequent experiments, the effect of hypothermia on the pharmacokinetics of fentanyl was studied in 4 piglets serving as their own controls. Both distribution volume (Vz) and total body clearance (CL) were significantly smaller during hypothermia. Our studies indicate that being a drug with a large distribution volume and a high hepatic extraction ratio, both CL and Vz are significantly reduced by hypothermia-induced hypoperfusion. In addition, TBC is influenced by the temperature-dependent hepatic metabolism of fentanyl.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00543972
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