PMID: 8466066Apr 1, 1993

Propofol infusion for maintenance of anesthesia in morbidly obese patients receiving nitrous oxide. A clinical and pharmacokinetic study

Anesthesiology
F ServinJ M Desmonts

Abstract

The pharmacokinetic and pharmacodynamic properties of propofol indicate that this may be an appropriate agent for induction and maintenance of anesthesia in obese patients. This study was designed to assess the rates of recovery and the pharmacokinetics of propofol infusions in morbidly obese patients. Anesthesia was induced and maintained using a stepwise infusion regimen of propofol in eight morbidly obese patients. The patients' lungs were ventilated with nitrous oxide:oxygen (66:34%). Pharmacokinetic parameters were calculated from iterative blood sampling during the propofol infusion and during 8 h after its completion. Results were compared with those from a concurrent study of propofol pharmacokinetics in nonobese adults. The initial volume of distribution of propofol was not modified in obese patients. Total body clearance increase was correlated to body weight (R = 0.76, 25.4 +/- 6.5 ml.kg-1.min-1, mean +/- SD). Volume of distribution at steady state was also correlated to body weight (R = 0.61, 1.63 +/- 0.54 l.kg-1, mean +/- SD). Propofol concentration at the time of eye opening in response to verbal command was 0.94 +/- 0.26 mg.l-1. Results from this study confirm the absence of propofol accumulation in morbidly obes...Continue Reading

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General Anesthesia
Drug Augmentation
Intravenous Infusion Procedures
Nitrous Oxide
Obesity, Morbid
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