British Journal of Anaesthesia, Vol 81, Issue 6 905-912, Copyright © 1998 by The Board of Management and Trustees of the British Journal of Anaesthesia
B. Preckel, W. Schlack, T. Comfere, D. Obal, H. Barthel and V. Thamer
It is known that volatile anaesthetics protect myocardial tissue against
ischaemic and reperfusion injury in vitro. In this investigation, we have
determined the effects of the inhalation anaesthetics, enflurane,
isoflurane, sevoflurane and desflurane, administered only during early
reperfusion, on myocardial reperfusion injury in vivo. Fifty
chloralose-anaesthetized rabbits were subjected to 30 min of occlusion of a
major coronary artery followed by 120 min of reperfusion. Left ventricular
pressure (LVP, tip-manometer), cardiac output (CO, ultrasonic flow probe)
and infarct size (triphenyltetrazolium staining) were determined. During
the first 15 min of reperfusion, five groups of 10 rabbits each received 1
MAC of enflurane (enflurane group), isoflurane (isoflurane group),
sevoflurane (sevoflurane group) or desflurane (desflurane group), and 10
rabbits served as untreated controls (control group). Haemodynamic baseline
values were similar between groups (mean LVP 106 (SEM 2) mm Hg; CO 281(7)
ml min-1). During coronary occlusion, LVP and CO were reduced to the same
extent in all groups (LVP 89% of baseline; CO 89%). Administration of
inhalation anaesthetics during early reperfusion further reduced both
variables, but they recovered after discontinuation of the anaesthetics to
values not different from control animals. Infarct size was reduced from 49
(5)% of the area at risk in the control group to 32 (3)% in the desflurane
group (P = 0.021), and to 36 (2)% in the sevoflurane group (P = 0.097). In
the enflurane group, infarct size was 39 (5)% (P = 0.272). Isoflurane had
no effect on infarct size (48 (5)%, P = 1.000). The results show that
desflurane and sevoflurane markedly reduced infarct size and therefore can
protect myocardium against reperfusion injury in vivo. Enflurane had only a
marginal effect and isoflurane offered no protection against reperfusion
injury in vivo. These different effects suggest different protective
mechanisms at the cellular level.
LABORATORY INVESTIGATIONS
Effects of enflurane, isoflurane, sevoflurane and desflurane on reperfusion injury after regional myocardial ischaemia in the rabbit heart in vivo
Institut fur Klinische Anaesthesiologie, Heinrich-Heine-Universitat Dusseldorf, Postfach 10 10 07, D-40001 Dusseldorf, Germany; Physiologisches Institut I, Heinrich-Heine-Universitat Dusseldorf, Postfach 10 10 07, D-40001 Dusseldorf, Germany
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