Comparison of CNS effects of propofol and thiopentone in cats.

Abstract:

:Using cats with chronically implanted brain electrodes, we have compared the effects of propofol on CNS electrical activities with those of thiopentone. Ten cats were allocated to receive either propofol (n = 5) or thiopentone (n = 5). Cats were anaesthetized initially with 4% halothane in oxygen. The trachea was intubated and the lungs ventilated mechanically. A femoral artery and a vein in a forepaw were cannulated for arterial pressure monitoring and fluid infusion. After the inspired concentration of halothane was maintained at 0.5%, EEG in the cortex, the amygdala and the hippocampus, somatosensory evoked potential (SEP) and reticular multi-unit activity (R-MUA) were recorded. Incremental doses of propofol or thiopentone were administered i.v. at 5-min intervals during 0.5% halothane anaesthesia. The cumulative doses of propofol and thiopentone were 2, 5, 10 and 20 mg kg-1, and 4, 10, 20 and 40 mg kg-1, respectively. Arterial pressure was maintained in excess of 100 mm Hg systolic by infusion of phenylephrine. All cats in the propofol group survived, but two in the thiopentone group died after the administration of thiopentone 40 mg kg-1. Changes observed in CNS activity were dose-related in all cases. The EEG changed with the increments of doses of propofol or thiopentone, from fast, small amplitude to complexes of fast and slow, large amplitude activities, burst suppression and flat EEG. SEP latency was prolonged by both agents: the peak latency of N1 changed from 15 (SD 2) ms to 20 (5) ms with propofol 20 mg kg-1, and from 14 (1) ms to 27 (2) ms with thiopentone 40 mg kg-1.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Br J Anaesth

authors

Tomoda K,Shingu K,Osawa M,Murakawa M,Mori K

doi

10.1093/bja/71.3.383

subject

Has Abstract

pub_date

1993-09-01 00:00:00

pages

383-7

issue

3

eissn

0007-0912

issn

1471-6771

pii

S0007-0912(17)45721-7

journal_volume

71

pub_type

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