Atrial bradycardia or the lazy sinus syndrome.
D000293:Adolescent; D000328:Adult; D000368:Aged; D000787:Angina Pectoris / Q000150:complications; D001281:Atrial Fibrillation / Q000150:complications; D001919:Bradycardia / Q000150:complications / Q000209:etiology*; D002318:Cardiovascular Diseases / Q000150:complications; D002908:Chronic Disease; D004562:Electrocardiography; D006325:Heart Atria; D006327:Heart Block / Q000150:complications; D006801:Humans; D008875:Middle Aged; D012849:Sinoatrial Node