title: [Histology of aging changes and PR prolongation in the human atrioventricular nodal cells].
authors.forename: K
authors.initials: K
authors.lastname: Shimizu
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000375:Aging / Q000473:pathology*; D001283:Atrioventricular Node / Q000166:cytology / Q000473:pathology*; D002648:Child; D004562:Electrocardiography; D006327:Heart Block / Q000473:pathology; D006329:Heart Conduction System / Q000473:pathology*; D006801:Humans; D008875:Middle Aged