This ECG shows normal sinus rhythm, an anterior myocardial infarction, and inferolateral injury consistent with an acute ST-elevation myocardial infarction (STEMI).
A P wave for every QRS complex and a QRS complex with every P wave, with a consistent PR interval and a rate > 60 and < 100 beats/min, signifies sinus rhythm.
Criteria for an anterior STEMI include new ST elevation (≥ 2 mm [0.2 mV]) at the J point in leads V3 and V4. Inferolateral injury is indicated inferiorly by ST changes in leads II, III, and aVL and laterally by the ST elevation in leads V5 and V6.
Subsequent cardiac catheterization showed an occluded proximal left anterior descending artery and significant diagonal and obtuse marginal disease.