Abstract
Novel approaches are required to improve clinical outcomes in patients with coronary heart disease (CHD). Ischemic conditioning—the practice of applying brief episodes of nonlethal ischemia and reperfusion to confer protection against a sustained episode of lethal ischemia and reperfusion injury—is one potential therapeutic strategy. Importantly, the protective stimulus can be applied before (ischemic preconditioning) or after (ischemic perconditioning) onset of the sustained episode of lethal ischemia, or even at the onset of myocardial reperfusion (ischemic postconditioning). Furthermore, the protective stimulus can be applied noninvasively by placing a blood-pressure cuff on an upper or lower limb to induce brief episodes of nonlethal ischemia and reperfusion (remote ischemic conditioning), a finding that has greatly facilitated the translation of ischemic conditioning to various clinical settings. In addition to mechanical approaches, elucidation of the signal-transduction pathways underlying ischemic conditioning has identified several novel targets for pharmacological conditioning. This Review highlights findings from proof-of-concept clinical studies conducted in the past 5–6 years, in which the therapeutic potential of ischemic and pharmacological conditioning has been realized. Large, randomized, controlled trials are now required to determine whether pharmacological and ischemic conditioning improve clinical end points and outcomes in patients with CHD.
Key Points
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Ischemic conditioning describes an endogenous phenomenon, in which one or more brief episodes of nonlethal ischemia and reperfusion confer protection against a sustained lethal episode of ischemia and reperfusion
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The conditioning stimulus can be applied before (ischemic preconditioning) or after the onset of (ischemic perconditioning) ischemia, or at the transition from sustained ischemia to reperfusion (ischemic postconditioning)
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The conditioning stimulus can, moreover, be applied either directly to the heart or to a distant organ or tissue, such as a limb (remote ischemic conditioning)
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Elucidation of the mechanistic pathways underlying ischemic conditioning has identified potential pharmacological cardioprotective strategies (pharmacological conditioning), which have been largely unsuccessful in the clinical setting
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Proof-of-concept studies reported benefits with ischemic perconditioning, postconditioning, and remote ischemic conditioning in patients with acute myocardial infarction, and those undergoing cardiac surgery or percutaneous coronary intervention
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Large, multicenter, randomized, placebo-controlled, clinical trials are now required to determine whether ischemic conditioning can improve clinical outcomes in patients with coronary heart disease
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Acknowledgements
D. J. Hausenloy's research is funded by the British Heart Foundation (FS/10/039/28270). His work was undertaken at University College London Hospital/University College London, which received a portion of funding from the UK Department of Health's NIH Research Biomedical Research Center's funding scheme.
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Hausenloy, D., Yellon, D. The therapeutic potential of ischemic conditioning: an update. Nat Rev Cardiol 8, 619–629 (2011). https://doi.org/10.1038/nrcardio.2011.85
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