title: Leftward shift of frontal plane QRS axis as a frequent manifestation of acute pulmonary embolism.
mesh_terms: D000208:Acute Disease; D004562:Electrocardiography; D006321:Heart / Q000503:physiopathology; D006801:Humans; D011655:Pulmonary Embolism / Q000175:diagnosis* / Q000503:physiopathology; D012189:Retrospective Studies; D014672:Vectorcardiography