The effects of intravenous lidocaine administration on the minimum alveolar concentration of isoflurane in cats.

Abstract:

:Lidocaine decreases the minimum alveolar concentration (MAC) of inhaled anesthetics and has been used clinically to reduce the requirements for other anesthetic drugs. In this study we examined the effects of lidocaine on isoflurane MAC in cats. Six cats were studied. In Experiment 1, the MAC of isoflurane was determined. An IV bolus of lidocaine 2 mg/kg was then administrated and venous plasma lidocaine concentrations were measured to determine pharmacokinetic values. In Experiment 2, lidocaine was administered to achieve target plasma concentrations between 1 and 11 microg/mL and the MAC of isoflurane was determined at each lidocaine plasma concentration. Actual lidocaine plasma concentrations were 1.06 +/- 0.12, 2.83 +/- 0.39, 4.93 +/- 0.64, 6.86 +/- 0.97, 8.86 +/- 2.10, and 9.84 +/- 1.34 microg/mL for the target concentrations of 1, 3, 5, 7, 9, and 11 microg/mL, respectively. The MAC of isoflurane in this study was 2.21% +/- 0.17%, 2.14% +/- 0.14%, 1.88% +/- 0.18%, 1.66% +/- 0.16%, 1.47% +/- 0.13%, 1.33% +/- 0.23%, and 1.06% +/- 0.19% at lidocaine target plasma concentrations of 0, 1, 3, 5, 7, 9, and 11 microg/mL, respectively. Lidocaine, at target plasma concentrations of 1, 3, 5, 7, 9, and 11 microg/mL, linearly decreased isoflurane MAC by -6% to 6%, 7% to 28%, 19% to 35%, 28% to 45%, 29% to 53%, and 44% to 59%, respectively. We conclude that lidocaine decreases the MAC of isoflurane.

journal_name

Anesth Analg

journal_title

Anesthesia and analgesia

authors

Pypendop BH,Ilkiw JE

doi

10.1213/01.ANE.0000139350.88158.38

subject

Has Abstract

pub_date

2005-01-01 00:00:00

pages

97-101

issue

1

eissn

0003-2999

issn

1526-7598

pii

100/1/97

journal_volume

100

pub_type

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