title: Study of 300 cases of chronic heart block. A clinical profile.
mesh_terms: D000328:Adult; D000368:Aged; D000437:Alcoholism / Q000150:complications; D002908:Chronic Disease; D003327:Coronary Disease / Q000150:complications; D048909:Diabetes Complications; D005260:Female; D006327:Heart Block / Q000453:epidemiology / Q000209:etiology* / Q000401:mortality; D006801:Humans; D006973:Hypertension / Q000150:complications; D008297:Male; D008875:Middle Aged; D012907:Smoking