What is Subendocardial perfusion defect – is that Microvascular dysfunction?

The subendocardial layers of the left ventricular wall are more sensitive to ischemia. Infarcts  start  in the subendocardium and progressively extend  to the mid and subepicardial layers if ischemia is severe and prolonged enough. It is not exclusive of microvascular dysfunction, but of any mechanism that  may precipitate myocardial infarction .

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