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(a) Electrocardiogram on admission showing sinus rhythm with ST elevation and negative T waves in leads I, aVL, and V6, and ST depression in the inferior leads. (b) Forty minutes later an electrocardiogram was obtained showing sinus rhythm with Q waves, ST elevation, and negative T waves in the inferior leads, ST elevation with negative T wave in lead V6, and ST depression in leads I and aVL. The QRS axis has changed.
