title: Bidirectional ventricular tachycardia of unknown etiology.
abstract: A 45 years old male presented to the emergency department with palpitations, headache and apprehension. His electrocardiogram revealed bidirectional ventricular tachycardia. He remained vitally stable and responded to intravenous beta-blocker. Initially digitalis toxicity was suspected but history was negative for digitalis intake. The cause remained unidentified in patient despite detailed investigations. During a short follow-up (of 6 months) he remained asymptomatic and no cause was further identified during this period. Some other unseen causes of bidirectional ventricular tachycardia need to be explored.
authors.affiliation: Department of Cardiology, National Institute of Cardiovascular Diseases, Karachi.
authors.forename: Mehboob
authors.initials: M
authors.lastname: Ali
authors.forename: Javaid Arif
authors.initials: JA
authors.lastname: Khan
authors.forename: Tariq
authors.initials: T
authors.lastname: Masood
authors.forename: Fahad
authors.initials: F
authors.lastname: Shamsi
authors.forename: Mushtaq Hussain
authors.initials: MH
authors.lastname: Dero
authors.forename: Sulman
authors.initials: S
authors.lastname: Khan
mesh_terms: D004562:Electrocardiography; D006801:Humans; D008297:Male; D008875:Middle Aged; D013610:Tachycardia / Q000209:etiology*; D017180:Tachycardia, Ventricular / Q000209:etiology*