Affiliation:
1. From the Mayo Clinic and Mayo Foundation, Rochester, Minn.
Abstract
The speed at which the excitatory process spreads through a certain segment of the myocardial syncytium depends upon the orientation of the fibers in that segment to each other and to the point of origin of excitation. Spread down a strip of fibers of which the long axis is parallel to the long axis of the strip is rapid as compared with spread down a strip in which the fibers run at a right angle to the long axis of the strip. Endocardial activation is rapid, not because of the presence of Purkinje fibers, but because the subendocardial bands of myocardium form a network through which excitation can move rapidly along the long axis of the fibers. Spread across the septum in bundle-branch block and across the free wall of the left ventricle in the normally activated heart is slow because excitation is moving through fibers the long axis of which is prependicular to the advancing wave of excitation.
Publisher
Ovid Technologies (Wolters Kluwer Health)
Subject
Physiology (medical),Cardiology and Cardiovascular Medicine
Reference5 articles.
1. A morphologic study of the cardiac conduction system in ungulates, dog, and man
2. ELECTROCARDIOGRAPHIC CHANGES ASSOCIATED WITH LESIONS IN THE DEEPER LAYERS OF THE MYOCARDIUM AN EXPERIMENTAL STUDY
3. PRUITT R. D. BURCHELL H. B. AND ESSEX H. E.: Unpublished data.
4. The spread of excitation in turtle, dog, cat and monkey ventricles;HARRIS A. S.;Am. J. Physiol.,1941
5. WILSON F. N. ROSENBAUM F. F. AND JOHNSTON F. D.: Interpretation of the ventricular complex of the electrocardiogram. In Dock W. and Snapper I.: Advances in Internal Medicine Vol. 2. New York Interscience Publishers Inc. 1947 Pp. 1-63.
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