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Effect of cardiopulmonary bypass on fentanyl distribution and elimination
Author(s) -
Koska Adolph J,
Romagnoli Alexander,
Kramer William G
Publication year - 1981
Publication title -
clinical pharmacology and therapeutics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.941
H-Index - 188
eISSN - 1532-6535
pISSN - 0009-9236
DOI - 10.1038/clpt.1981.16
Subject(s) - fentanyl , cardiopulmonary bypass , indocyanine green , volume of distribution , medicine , anesthesia , distribution volume , pharmacokinetics , surgery
Fentanyl kinetics was studied in two groups of six patients, one group undergoing surgery with and one without cardiopulmonary bypass; the latter served as the controls. Plasma fentanyl concentrations declined biexponentially in the control patients with an average half‐life (t½β) of 3.3 ± 1.1 hr, total plasma clearance of 11.2 ±3.4 ml/min/kg, and volume of distribution (Vdβ) of 3.2 ± 1.5 l/kg. The plasma concentration/time curves were severely disrupted during cardiopulmonary bypass but appeared to regain a log‐linear decay once bypass was complete. This elimination phase had a t½ of 5.2 ± 2.7 hr, longer than that in the control patients. Since fentanyl is eliminated primarily by hepatic metabolism, decreased liver plasma flow observed during and after bypass, as evidenced by a 30% decrease in indocyanine green clearance, may contribute to the extended t½. The prolonged t½ has clinical importance because of potentially prolonged effects and their relation to other drugs and the clinical management of the patient. Clinical Pharmacology and Therapeutics (1981) 29, 100–105; doi: 10.1038/clpt.1981.16