an episodic condition with an abrupt onset and termination
supraventricular tachycardia (SVT)
any tachyarrhythmia that requires atrial and/or atrioventricular (AV) nodal tissue for its initiation and maintenance. narrow-complex, regular, rapid rhythm; (medscape)
PSVT etiologies
Reentry mechanism. May be induced by premature atrial or ventricular ectopic beats, hyperthyroidism and stimulants, including caffeine, drugs, and alcohol. (medscape)