EXPERIMENTAL STUDY OF INCOMPLETE RIGHT BUNDLE BRANCH BLOCK. ABOUT ITS PATTERNS OF ACUTE DILATATION OF RIGHT VENTRICLE EXPERIMENTALY PRODUCED BY MECHANICAL COMPRESSION OF PULMONARY ARTERY

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In 19 dogs, E.C.G. of experimental acute dilatation of right ventricle produced by mechanical compression of pulmonary artery was studied by means of simultaneous epicardial, differential and right intraventricular leads. The following results were obtained:1. Remarkable changes of E.C.G. were not seen in 5 dogs whose pericards were not opened and whose right ventricles were dilated by mechanical compression of pulmonary artery.2. As to 12 dogs whose pericards were cut opened, rsRS′ pattern appeared in conus arteriosus in all cases, but in some cases there was no change of ventricular activation time (V.A.T.). With respect to its reason the following could be suggested that appearance of rsR′S′ pattern was not due to the conduction disturbance, but to the right ventricular dilatation itself.3. In many cases, the changes of ventricular activation time of epicardial lead were most remarkable in conus arteriosus, but in some cases extroadinary prolongation of V.A.T. in middle and basal epicardial regions of right ventricle was more pronounced than that in conus artericsus. These changes were reversible in most of cases.
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