Classification of sinus node dysfunction.
D001145:Arrhythmias, Cardiac / Q000145:classification / Q000209:etiology / Q000503:physiopathology*; D002908:Chronic Disease; D006327:Heart Block / Q000145:classification / Q000209:etiology / Q000503:physiopathology*; D006801:Humans; D012849:Sinoatrial Node / Q000503:physiopathology*