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Database of Abstracts of Reviews of Effects (DARE): Quality-assessed Reviews [Internet]. York (UK): Centre for Reviews and Dissemination (UK); 1995-.

Database of Abstracts of Reviews of Effects (DARE): Quality-assessed Reviews.

Myocardial protection with volatile anaesthetic agents during coronary artery bypass surgery: a meta-analysis

Review published: 2006.

Bibliographic details: Symons J A, Myles P S.  Myocardial protection with volatile anaesthetic agents during coronary artery bypass surgery: a meta-analysis. British Journal of Anaesthesia 2006; 97(2): 127-136. [PubMed: 16793778]

Quality assessment

The authors concluded that there was some evidence that volatile anaesthetic agents protect the myocardium during coronary artery bypass graft surgery, but further research is required. The authors' cautious conclusions appear appropriate, but it is not possible to confirm their reliability given the incomplete reporting of review methods and study quality and the differences between the studies. Full critical summary

Abstract

Previous studies have investigated the role of volatile anaesthetic agents in myocardial protection during coronary artery bypass graft (CABG) surgery, and some have identified beneficial effects. However, these studies have been too small to identify a significant effect on myocardial infarction (MI) or mortality. We undertook a systematic overview and meta-analysis of all randomized trials comparing volatile with non-volatile anaesthesia in CABG surgery. We identified 27 trials that included 2979 patients. There was no significant difference in myocardial ischaemia, MI, intensive care unit length of stay or hospital mortality between the groups (all P>0.05). Post-bypass, patients randomized to receive volatile anaesthetics had 20% higher cardiac indices (P=0.006), significantly lower troponin I serum concentrations (P=0.002) and lesser requirement for inotropic support (P=0.004) compared with those randomized to receive i.v. anaesthetics. Duration of mechanical ventilation was reduced by 2.7 h (P=0.04), and there was a 1 day decrease in hospital length of stay (P<0.001). Some of these outcomes were based on a smaller number of trials because of incomplete data, largely because the individual trials focused on one or more surrogate endpoints. We found some evidence that volatile anaesthetic agents provide myocardial protection in CABG surgery, but larger adequately powered trials with agreed, defined outcomes need to be done to fully assess a possible beneficial effect of volatile anaesthetic agents on the risk of MI and mortality.

CRD has determined that this article meets the DARE scientific quality criteria for a systematic review.

Copyright © 2013 University of York.

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