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ST segment depression in right-sided electrocardiographic leads in patients with acute myocardial infarction.

The presence of ST segment depression in right-sided electrocardiographic leads has been infrequently reported in the literature. We report the cases of two patients with anterolateral and posterior myocardial infarctions with ST segment depression in right-sided electrocardiographic leads. We hypothesize that this electrocardiographic change is a reciprocal expression of ST segment elevation of the opposing left ventricular wall.