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Is protection by inhalation agents volatile? Controversies in cardioprotection
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The old Latin saying nomen est omen suggests that a name is indicative of, or notorious for, its true but hidden nature. Likewise, current clinical evidence on organ protection elicited by ether-derived inhalation agents (anaesthetic preconditioning) appears volatile or, to say the least, not fully convincing. In this issue of the British Journal of Anaesthesia, Piriou and colleagues1 report on sevoflurane preconditioning in patients undergoing on-pump coronary artery bypass graft (CABG) surgery. Despite some postoperative functional improvement, the primary outcome measure troponin I and some molecular markers of an effective preconditioning process in the heart remained unaffected. These rather disappointing results conflict, at least in part, with previous more promising clinical reports2–6 and call for clarification.
Motivated by the work of Verdouw and colleagues7 and Reimer and colleagues,8 Murry and colleagues9 described for the first time in 1986 the phenomenon termed ischaemic preconditioning in canine myocardium. Since then, this
Declaration of Interest
Cardiovascular Anesthesia Research Laboratory
Institute of Anesthesiology
E–HOF, University Hospital Zurich and
Zurich Center of Integrative Human Physiology, ZIHP
University of Zurich
Rämistrasse 100 CH-8091
Zurich
Switzerland
E-mail: michael.zaugg@usz.ch
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