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Figure 1. Serial electrocardiograms (lead V4) were obtained in a 67-year-old man taking digoxin for paroxysmal supraventricular tachycardia. An electrocardiogram obtained on June 28, 1983, showed no abnormalities. About six weeks later on August 15, while awaiting surgery for peripheral vascular disease, the patient had an episode of paroxysmal supraventricular tachycardia (first electrocardiogram in second row) that responded to carotid-sinus massage. An electrocardiogram obtained shortly after conversion to sinus rhythm showed atrial premature beats and minor T-wave inversions (second electrocardiogram in second row), which became deeper over the next 24 hours (third electrocardiogram in second row). The patient . . . [Full Text of this Article] |