title: QRS duration in chronic obstructive lung disease.
mesh_terms: D002908:Chronic Disease; D004562:Electrocardiography; D006329:Heart Conduction System / Q000503:physiopathology; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged