title: Atrial ultrastructure in patients with fixed intra-atrial block.
mesh_terms: D001161:Arteriosclerosis / Q000473:pathology; D001706:Biopsy; D003094:Collagen / Q000032:analysis; D003327:Coronary Disease / Q000473:pathology; D004562:Electrocardiography; D004721:Endoplasmic Reticulum; D006325:Heart Atria / Q000473:pathology*; D006327:Heart Block / Q000473:pathology* / Q000503:physiopathology; D006329:Heart Conduction System / Q000503:physiopathology; D006330:Heart Defects, Congenital / Q000473:pathology; D006801:Humans; D008854:Microscopy, Electron; D009206:Myocardium / Q000473:pathology*; D012214:Rheumatic Heart Disease / Q000473:pathology; D012508:Sarcolemma
chemical_list: D003094:Collagen