title: Intrahisian block in cardiomyopathy.
abstract: Two patients with cardiomyopathy and intrahisian atrioventricular [A-V] block are described. The first patient with underlying non-obstructive hypertrophic cardiomyopathy had split His bundle potentials only during atrial pacing and presented associated conduction abnormalities: enhanced A-V nodal conduction and sick sinus syndrome. The second patient had progressive muscular dystrophy and a complete intrahisian A-V block. Attention is called to the possible interrelationship between different conduction abnormalities and to their clinical implications.
mesh_terms: D000328:Adult; D001283:Atrioventricular Node / Q000503:physiopathology; D002036:Bundle of His / Q000503:physiopathology*; D002037:Bundle-Branch Block / Q000503:physiopathology*; D002304:Cardiac Pacing, Artificial; D009202:Cardiomyopathies / Q000503:physiopathology*; D002312:Cardiomyopathy, Hypertrophic / Q000503:physiopathology; D004562:Electrocardiography; D005260:Female; D006327:Heart Block / Q000503:physiopathology; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009136:Muscular Dystrophies / Q000503:physiopathology; D012804:Sick Sinus Syndrome / Q000503:physiopathology; D012849:Sinoatrial Node / Q000503:physiopathology