title: Site of functional right bundle branch block.
abstract: An in vivo canine heart was prepared by utilizing a temporary right heart bypass system to place close bipolar electrodes along the course of the right bundle branch. Activation within the right bundle could be recorded in up to six locations along the right bundle with premature supraventricular stimulation that caused functional right bundle branch block. The loss of activation recordings was found to occur in the proximal 0 to 6 mm. of the right bundle branch in every instance and in nine different preparations.
mesh_terms: D000200:Action Potentials; D000818:Animals; D002037:Bundle-Branch Block / Q000503:physiopathology*; D004285:Dogs; D004566:Electrodes; D006329:Heart Conduction System / Q000503:physiopathology