title: Pathological studies in sinoatrial disorder (sick sinus syndrome).
mesh_terms: D000368:Aged; D000792:Angiography; D001145:Arrhythmias, Cardiac / Q000503:physiopathology; D001344:Autopsy; D006325:Heart Atria / Q000473:pathology / Q000503:physiopathology; D006327:Heart Block / Q000473:pathology*; D006329:Heart Conduction System / Q000473:pathology*; D006801:Humans; D008875:Middle Aged; D009206:Myocardium / Q000473:pathology; D012848:Sinoatrial Block / Q000473:pathology*; D012849:Sinoatrial Node / Q000473:pathology