Abstract
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:
| Original language | English (US) |
|---|---|
| Pages (from-to) | 100-105 |
| Number of pages | 6 |
| Journal | Clinical Pharmacology & Therapeutics |
| Volume | 29 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 1981 |
| Externally published | Yes |
ASJC Scopus subject areas
- Pharmacology
- Pharmacology (medical)