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THE clinical course of complete heart block is unpredictable. Penton et al.,1 in an excellent clinical review of complete heart block, reported that the average duration of life was about three years after the first episode of syncope and about two years after the first (presumably documented) appearance of complete heart block. The two principal clinical manifestations are syncopal attacks due to ventricular standstill or ventricular fibrillation and congestive heart failure due to low cardiac output.2 Recently, we were confronted with rapid deterioration of a seventy-three-year-old man who had been in complete heart block for about two years. He had . . .
Glenn et al. (1959) studied this question.
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