The effect of positive end-expiratory pressure ventilation on propofol concentrations during general anesthesia in humans.

Abstract:

:The present study investigated the effects of positive end-expiratory pressure (PEEP) on propofol concentrations in humans. Eleven patients undergoing elective surgery were enrolled in this study. Anesthesia was induced with propofol, then maintained using 60% nitrous oxide in oxygen, fentanyl 10-20 microg/kg and continuous infusion of propofol. Vecuronium was used to facilitate the artificial ventilation of the lungs. Propofol was administered to all subjects via target-controlled infusion to achieve a propofol concentration of 6.0 microg/mL at intubation and 2.0 microg/mL after intubation. Before, during and after PEEP level of 10 cmH(2)O, cardiac output (CO) and effective liver blood flow (LBF) was measured using indocyanine green as an indicator and blood propofol concentration was determined using high-performance liquid chromatography. Data are expressed as median and range. After PEEP of 10 cmH(2)O was applied, CO and effective LBF was significantly decreased from 5.5 (3.8-6.8) L/min to 4.5 (3.2-5.8) L/min (P < 0.05), 0.78 (0.65-1.21) L/min to 0.65 (0.50-0.89) L/min (P < 0.05), respectively. Propofol concentration was significantly increased from 2.21 (1.46-2.63) microg/mL to 2.45(1.79-2.89) microg/mL (P < 0.05). These data indicate that propofol concentrations can be increased by PEEP, suggesting the possibility of overdosing following PEEP.

journal_name

Fundam Clin Pharmacol

authors

Takizawa E,Ito N,Ishizeki J,Goto F,Hiraoka H,Takizawa D

doi

10.1111/j.1472-8206.2006.00436.x

subject

Has Abstract

pub_date

2006-10-01 00:00:00

pages

489-92

issue

5

eissn

0767-3981

issn

1472-8206

pii

FCP436

journal_volume

20

pub_type

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