[Experimental study of successive range of excitation of the heart ventricles].
The succession of excitation spreading about the cardiac ventricles was studied in 28 dogs using the intramural multipolar technique. The primary foci of excitation were found in the zones of the subendocardium on the borderline between the lower and middle portions of the left side of the ventricular septum, and under the base of the anterior papillary muscle on the right side of the ventricular septum. The excitation of the interventricular septum throughout its thickness occurs first of all in the anterior part of its mid-portion where the depolarization waves moves exclusively from left to right. Lastly the posterior lateral subendocardial layers of the bases of the free walls and the upper portion of the ventricular septum are depolarized. In some parts of the interventricular septum and of the left free wall the excitation wave first reaches the zones located deeply under the endocardium, then spreads towards the endo- and epicardium, changing its direction several times.
D000200:Action Potentials; D000818:Animals; D004285:Dogs; D004553:Electric Conductivity; D004558:Electric Stimulation; D004699:Endocardium / Q000502:physiology; D006321:Heart / Q000502:physiology*; D006346:Heart Septum / Q000502:physiology; D016276:Ventricular Function
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