Fascicular VT
Ventricular tachycardia originating from or involving the left ventricular fascicular conduction system.
Full Definition
A specific type of idiopathic ventricular tachycardia that originates from or utilizes the left ventricular fascicular conduction system, particularly the posterior fascicle. Fascicular VT typically occurs in patients with structurally normal hearts and is characterized by distinctive ECG morphology showing right bundle branch block pattern with left axis deviation. The mechanism involves reentry within the Purkinje network, and these arrhythmias are often verapamil-sensitive. Fascicular VT can be successfully treated with catheter ablation targeting the specific fascicular involvement, usually in the inferior left ventricular region.
Usage
Usage note: Abbreviate as 'fascicular VT' rather than 'FVT' in formal documentation.
In Context
- "The fascicular VT exhibited the characteristic verapamil sensitivity and RBBB morphology with left axis deviation." — EP consultation report
- "Mapping during fascicular VT revealed earliest activation along the posterior fascicle." — Ablation case report