title: Familial heart block and sick sinus syndrome of adult onset. Report to two families and review of the literature.
mesh_terms: D000328:Adult; D000368:Aged; D001145:Arrhythmias, Cardiac / Q000235:genetics*; D004562:Electrocardiography; D005260:Female; D006327:Heart Block / Q000209:etiology / Q000235:genetics*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010375:Pedigree; D012849:Sinoatrial Node / Q000473:pathology*