title: [Analysis of arrhythmia and ST-T wave changes in 324 cases of COPD patients in the Qinghai highlands].
mesh_terms: D000531:Altitude; D001145:Arrhythmias, Cardiac / Q000209:etiology*; D002681:China; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008297:Male; D009206:Myocardium / Q000473:pathology; D009336:Necrosis / Q000209:etiology; D011660:Pulmonary Heart Disease / Q000150:complications* / Q000503:physiopathology