Assessment of Myocardial Ischemic Memory Using Speckle Tracking Echocardiography

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Myocardial ischemic memory imaging, involving the visualization of abnormalities provoked by ischemia and sustained even after restoration of perfusion, is desirable because identification of myocardial ischemia in patients with a history of chest pain is still challenging. Post-systolic index (PSI) offers a sensitive marker of myocardial ischemia, but whether this abnormal thickening remains after relief from brief ischemia is unclear. From animal experiments, we found that PSI remained even after recovery from ischemia. Our results suggest that assessment of PSI is valuable for detecting myocardial ischemic memory.