title: Letter: Systolic time intervals.
mesh_terms: D002302:Cardiac Output; D002908:Chronic Disease; D004562:Electrocardiography; D006321:Heart / Q000503:physiopathology*; D006339:Heart Rate; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000503:physiopathology*