Abstract
The patient was a 73-year-old man admitted because of two hours of chest pain. Serial ECGs and enzyme studies confirmed the diagnosis of nontransmural myocardial infarction. For unclear reaSons, the patient had been taking digoxin 0.25 mg daily; admission serum digoxin level was 0.3 ng/ml. The arrhythmia in Figure 1 was seen upon the patient’s arrival in the emergency room. Figure LA shows a 12 lead ECG of the tachycardiawith a rate ofll5/min, QRS duration of0.12 second, and 1:1 retrograde conduction. A QS pattern is present in leads aVL, V1. ,
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