Abstract
II.On Bundle Branch Block According to "Chain-doublets Theory (Maekawa)", the intrinsic deflection crosses the base line at the moment when the stimulus reaches a point directly beneath the leading portion. From this standpoint I have analysed the bundle branch block curves. Those results are as follows;(1) The common type is left bundle branch block. (2) The rare type is incomplete block in the right branch and the left anterior subdivision, particularly in the former. (3) Wilson's block is right bundle branch block, accompanied by delayed conduction in the left anterior subdivision. That usual type is incomplete block in the main stem of the right branch, and that unusual type is complete block already in the main stem of the right branch and the left anterior subdivision. (4) From above-stated data it is concluded that modern terminology for bundle branch block is more reasonable than classical one, but not perfectly reasonable ; and that bundle branch block should not be classified distinctively left or right : and that incomplete block in the bundle branch or the bundle stem may be present with or without complete bundle branch block.
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