Acute Coronary Syndrome Manifesting Dynamic Electrocardiographic Changes.

We present a patient with acute coronary syndrome manifesting dynamic evolution from an anterior ST-segment elevation myocardial infarction electrocardiographic pattern to the de Winter electrocardiographic pattern suggestive of severe residual myocardial ischemia owing to a partially recanalized but still subtotally occluded culprit artery. Emergency percutaneous coronary intervention was successfully performed.