“…and Pick, 1956). In a review of the clinical literature, only 3 cases of 1:1 V-A conduction and 6 cases of V-A conduction with variable block were found (Foster and Thayer, 1950). Recently, however, Kistin (1961) found V-A conduction in paroxysmal ventricular tachycardia to be a relatively frequent occurrence.…”