Anatomy, histology, and pathology of the cardiac conduction system—part VI

Various pathologic conditions producing atrioventricular block are reviewed. Calcific atrioventricular block (aortic stenosis, mitral valve annular calcium), active infective endocarditis (“ring” abscess), acute and healed myocarditis, various collagen‐vascular diseases, amyloidosis, and tumors are reviewed as causes of atrioventricular block. Various diseases producing bundle‐branch block are also discussed.

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