title: Prognosis in severe chronic obstructive pulmonary disease. Relation to degree of obstruction, age and sex and electrocardiographic changes suggesting cor pulmonale.
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D002908:Chronic Disease; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000150:complications / Q000401:mortality*; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D011660:Pulmonary Heart Disease / Q000150:complications / Q000401:mortality*; D012189:Retrospective Studies; D012737:Sex Factors; D013147:Spirometry; D013997:Time Factors