title: Ventricular tachycardia complicating head-up tilt test: the role of coronary artery spasm.
abstract: Head-up tilt test (HUT) is frequently used for diagnosis of neurocardiogenic syncope. It mimics orthostatic stress resulting in venous pooling, central hypovolemia with compensated left ventricular hypercontraction, and sympathetic stimulation. Although generally considered to be a safe procedure, we hereby present a rare complication of HUT in a 50-year-old woman with isoproterenol infusion inducing coronary spasm that resulted in ventricular tachycardia.
authors.affiliation: Division of Cardiology, Department of Medicine, Queen Mary Hospital, The University of Hong Kong, Hong Kong.
authors.forename: Kai-Hang
authors.initials: KH
authors.lastname: Yiu
authors.forename: Hung-Fat
authors.initials: HF
authors.lastname: Tse
authors.forename: Chu-Pak
authors.initials: CP
authors.lastname: Lau
mesh_terms: D000889:Anti-Arrhythmia Agents / Q000627:therapeutic use; D001241:Aspirin / Q000627:therapeutic use; D002121:Calcium Channel Blockers / Q000627:therapeutic use; D016887:Cardiopulmonary Resuscitation; D002316:Cardiotonic Agents / Q000009:adverse effects; D003329:Coronary Vasospasm / Q000139:chemically induced / Q000150:complications* / Q000503:physiopathology; D004359:Drug Therapy, Combination; D004562:Electrocardiography; D005260:Female; D006801:Humans; D007545:Isoproterenol / Q000009:adverse effects; D008875:Middle Aged; D009566:Nitrates / Q000627:therapeutic use; D013575:Syncope / Q000175:diagnosis; D017180:Tachycardia, Ventricular / Q000188:drug therapy / Q000209:etiology*; D018667:Tilt-Table Test / Q000009:adverse effects* / Q000379:methods; D016896:Treatment Outcome; D019210:Troponin I / Q000097:blood
chemical_list: D000889:Anti-Arrhythmia Agents; D002121:Calcium Channel Blockers; D002316:Cardiotonic Agents; D009566:Nitrates; D019210:Troponin I; D007545:Isoproterenol; D001241:Aspirin