title: Unexplained atrial flutter: a frequent herald of pulmonary embolism.
mesh_terms: D000792:Angiography; D001282:Atrial Flutter / Q000209:etiology*; D001794:Blood Pressure; D004562:Electrocardiography; D004947:Esophagus; D006801:Humans; D010100:Oxygen / Q000097:blood; D011652:Pulmonary Circulation; D011655:Pulmonary Embolism / Q000175:diagnosis* / Q000000981:diagnostic imaging; D011877:Radionuclide Imaging; D012711:Serum Albumin, Radio-Iodinated; D014655:Vascular Resistance
chemical_list: D012711:Serum Albumin, Radio-Iodinated; D010100:Oxygen