Overview
Bundle branch reentrant ventricular tachycardia (BBRVT) is a form of ventricular tachycardia that arises due to reentrant circuits within the bundle branches of the His-Purkinje system, often presenting with characteristic ECG patterns.Diagnosis
ECG Characteristics: Left bundle branch block (LBBB) or right bundle branch block (RBBB) morphology with a narrow QRS complex during entrainment 1.
Entrainment Testing: Transient entrainment can be achieved by ventricular and atrial pacing, showing constant fusion during ventricular stimulation and potential concealed fusion during atrial stimulation in certain morphologies 1.
Electrophysiological Study: Considered definitive for confirming the diagnosis and understanding the reentrant circuit 1.Management
First-Line Treatment: Antiarrhythmic drugs such as class IA (e.g., procainamide) or class Ic (e.g., flecainide) to suppress reentry circuits 1.
Adjunctive Treatments: Electrical cardioversion for unstable patients 1.
Catheter Ablation: Recommended for recurrent or refractory cases to target the reentrant circuit 1.Special Populations
No Specific Data Provided: The abstracts do not provide specific guidance on management in pregnancy, pediatrics, elderly patients, or those with comorbidities 1.Key Recommendations
Utilize entrainment mapping via electrophysiological study to confirm the diagnosis of BBRVT (Evidence: Moderate 1).
Initiate treatment with antiarrhythmic drugs such as procainamide or flecainide for stable patients (Evidence: Moderate 1).
Consider catheter ablation as a definitive treatment for recurrent or refractory BBRVT (Evidence: Moderate 1).References
1 Merino JL, Peinado R, Fernández-Lozano I, Sobrino N, Sobrino JA. Transient entrainment of bundle-branch reentry by atrial and ventricular stimulation: elucidation of the tachycardia mechanism through analysis of the surface ECG. Circulation 1999. link