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Body surface potential distributions during idiopathic ventricular tachycardia
1Research Center, Hôpital du Sacré-Coeur de Montréal, Québec, Canada.
Circulation
|April 1, 1995
Summary
Body surface potential maps (BSPMs) reveal distinct patterns for idiopathic ventricular tachycardia (VT) originating from the right ventricular outflow tract (LBBB VT) versus the left ventricular apex (RBBB VT). These BSPM patterns aid in identifying VT origins.
Area of Science:
- Cardiology
- Electrophysiology
- Medical Imaging
Background:
- Idiopathic ventricular tachycardia (VT) presents diagnostic challenges.
- Differentiating VT morphologies is crucial for effective treatment.
- Body surface potential mapping (BSPM) offers a non-invasive method to study cardiac electrical activity.
Purpose of the Study:
- To describe body surface potential maps (BSPMs) during idiopathic ventricular tachycardia (VT).
- To identify differences in BSPMs between various idiopathic VT morphologies.
- To correlate BSPM findings with the anatomical origin of VT.
Main Methods:
- Performed BSPMs during VT in 12 patients with symptomatic idiopathic VT.
- Analyzed BSPM patterns for left bundle branch block (LBBB) and right bundle branch block (RBBB) VT morphologies.
- Correlated BSPM findings with electrophysiological study results and ablation outcomes.
Main Results:
- Identified unique, stable BSPM patterns for idiopathic LBBB VT, consistent with a right ventricular outflow tract origin.
- Observed evolving, two-phase BSPM patterns for RBBB VT, indicative of a left ventricular apical origin.
- Confirmed VT origins through successful radiofrequency ablation and surgical mapping.
Conclusions:
- Two distinct BSPM patterns differentiate idiopathic VT origins.
- LBBB VT exhibits a stable pattern linked to infundibular (right ventricular outflow tract) origin.
- RBBB VT shows an evolving pattern associated with apical (left ventricular) origin.