Paroxysmal supraventricular tachycardia (PSVT) - Overview
Alternative Names
PSVT; Supraventricular tachycardia
Definition of Paroxysmal supraventricular tachycardia (PSVT):
Paroxysmal supraventricular tachycardia (PSVT) is an occasional rapid heart rate. "Paroxysmal" means from time to time.
Causes, incidence, and risk factors:
Normally, the chambers of the heart (atria and ventricles) contract in a coordinated manner. The contractions are caused by an electrical signal that begins in an area of the heart called the sinoatrial node (also called the sinus node or SA node). The signal moves through the upper heart chambers (the atria) and tells the atria to contract.
PSVT starts with events taking place above the lower heart chambers (ventricles). PSVT can be initiated in the SA node, in the upper heart chambers (atria), in the atrial conduction pathways, or other areas.
PSVT can occur with digitalis toxicity and conditions such as Wolff-Parkinson-White syndrome.
The condition occurs most often in young people and infants.
The following increase your risk for PSVT:
- Reviewed last on: 5/12/2008
- Larry A. Weinrauch, MD, Assistant Professor of Medicine, Harvard Medical School, and Private practice specializing in Cardiovascular Disease, Watertown, MA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
References
Olgin JE, Zipes DP. In: Specific Arrhythmias: Diagnosis and Treatment. In: Libby P, Bonow RO, Mann DL, Zipes DP, eds. Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine. 8th ed. St. Louis, Mo: WB Saunders; 2007: chap. 35.
