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ENDOCARDIAL VOLTAGE MAPPING OF IDIOPATHIC VENTRICULAR ARRHYTHMIA ORIGINATING FROM THE RIGHT VENTRICULAR OUTFLOW TRACT
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Abstract
Background: Idiopathic ventricular arrhythmias originating from the right ventricular outflow tract (RVOT) are typically observed in structurally normal hearts. However, detailed voltage characteristics of the RVOT substrate remain incompletely described. This study aimed to characterize bipolar endocardial voltage mapping in patients with idiopathic RVOT ventricular arrhythmias and to provide reference data for electroanatomical mapping strategies. Methods: We conducted a retrospective observational study of patients diagnosed with idiopathic premature ventricular complexes or ventricular tachycardia originating from the RVOT who underwent three-dimensional electroanatomical mapping and catheter ablation at a tertiary center. Bipolar endocardial voltage data were collected during sinus rhythm and analyzed according to anatomical regions of the RVOT. Voltage at successful ablation sites was compared with adjacent areas and between septal and free wall regions. Results: The mean bipolar voltage within the RVOT was 3.41 ± 1.34 mV. No low-voltage areas suggestive of myocardial scar were identified. Bipolar voltage at successful ablation sites did not significantly differ from surrounding regions. Additionally, no significant differences were observed between septal and free wall segments (p > 0.05). Conclusions: Endocardial voltage mapping in idiopathic RVOT ventricular arrhythmias demonstrates preserved myocardial substrate without evidence of scar-related low-voltage zones. These findings support the benign structural nature of idiopathic RVOT arrhythmias and provide reference voltage data that may assist in refining electroanatomical mapping and catheter ablation strategies in clinical practice.
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Keywords
Idiopathic ventricular arrhythmias; Right ventricular outflow tract; Voltage mapping
References
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