Ischemic preconditioning—an unfulfilled promise

• There are a multitude of techniques for conditioning.
• Conditioning has been utilized in percutaneous coronary intervention and cardiac surgery.
• There is a lack of consistency in the techniques utilized and outcomes that have been measured.
• The results of studies to date lack a consistency in the benefits of conditioning.

Myocardial reperfusion injury has been identified as a key determinant of myocardial infarct size in patients undergoing percutaneous or surgical interventions. Although the molecular mechanisms underpinning reperfusion injury have been elucidated, attempts at translating this understanding into clinical benefit for patients undergoing cardiac interventions have produced mixed results. Ischemic conditioning has been applied before, during, or after an ischemic insult to the myocardium and has taken the form of local induction of ischemia or ischemia of distant tissues. Clinical studies have confirmed the safety of differing conditioning techniques, but the benefit of such techniques in reducing hard clinical event rates has produced mixed results. The aim of this article is to review the role of ischemic conditioning in patients undergoing percutaneous and surgical coronary revascularization.