title: Vertical P-wave axis and narrow QRS complexes: a diagnostic dyad for emphysema.
authors.forename: John E
authors.initials: JE
authors.lastname: Madias
mesh_terms: D001145:Arrhythmias, Cardiac / Q000175:diagnosis*; D004562:Electrocardiography; D006339:Heart Rate; D006801:Humans; D006973:Hypertension / Q000175:diagnosis; D017379:Hypertrophy, Left Ventricular / Q000175:diagnosis; D029424:Pulmonary Disease, Chronic Obstructive / Q000175:diagnosis; D011656:Pulmonary Emphysema / Q000175:diagnosis*; D012815:Signal Processing, Computer-Assisted; D013223:Statistics as Topic