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Early revascularization during an acute ST-segment elevation myocardial infarction enhances myocardial salvage and improves short-term outcomes. However, data also suggest that an open infarct-related artery improves longer term survival, perhaps by reducing risk for arrhythmia and sudden death. This “open-artery hypothesis” has led to the practice of opening occluded infarct-related arteries, even days or weeks after the MI, when myocardial salvage is unlikely.
In a large international trial of late revascularization, investigators randomized 2166 stable patients — all of whom had total occlusion of the infarct-related artery 3 to 28 days after MI, and an ejection fraction of <50% or a proximal occlusion of a major vessel supplying a large …