The complete cancellation of abnormal Q waves due to an old anteroseptal infarction following subsequent acute posterior myocardial infarction.

Abstract
A rare case of multiple infarction is described. An abnormal Q wave due to an old anteroseptal infarction was completely masked by a new contralateral posterior myocardial infarction. Coronary angiogram revealed multiple stenoses of segments 1 (100%), 7 (99%), 12 (90%) and 13 (99%). Left ventriculography also showed akinesis of segments 2, 3 4 and 6, and reduced wall motion in segments 1, 5 and 7. These findings, together with electrocardiographic changes from before the present attack reinforce the above interpretation.

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