Abstract
(1) The Purkinje potentials were registered in different regions of the interventricular septum and the free ventricular walls in the dog heart. (2) A mapping of the distribution of these potentials is presented. (3) Experimental proof that the deflections recorded represent the potentials of the Purkinje tissue is given. (4) The behavior of these potentials in cases of complete and incomplete bundle branch block, as well as with different degrees of A-V block, was studied. A progressively delayed inscription of these potentials was found in respect to the potentials of the bundle of His as well as a progressive approach to the beginning of QRS in Lead III in the blocked side. (5) The behavior of the Purkinje potentials recorded at the interventricular septum after complete bundle branch block speaks in favor of the existence of a physiologic barrier which separates the left and right septal masses.
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