1Harrison DC. Ambulatory eleltrocard-iog raphy for diaghosis and treatment of Cardiacarrhy thmia. N Engl J Med,1976, 294:373-380
2Gersten G. Age Changes in myocardial function and exercise response. Prog Cardiovasc Pis 1976, 77:5-50
3Aronow W S: Corre lation of atrial fi-brill ation with presence or absence of mitral Anular calcium in 604persons older than 60years. Am J Caradiol, 1987, 50: 1213-1214
