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Long-term conservative therapy of chronic AV block.

. Thirty-six of 98 patients with chronic advanced AV block have been treated conservatively by us, during the 5-year period 1966–70. Follow-up studies were made until Aug. 1973. When oral test doses of isoprenaline increased the heart rate without side-effects, long-term isoprenaline abolished syncope in most patients both with normal and with widened QRS complexes. Eighteen patients died during the observation period, but death was in most cases unrelated to block. The study shows that conservative therapy may be used with fair sucess in selected patients.