ISSN: 1859 - 2872
Electrocardiogram and cardiac electrophysiology characteristics of the premature ventricular contractions originating from right ventricle
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Abstract
Objective: To describe the electrocardiogram and electrophysiological characteristics of right ventricular premature ventricular contractions (PVCs). Subject and method: A cross-sectional descriptive study on 152 patients with right ventricular PVCs undergoing electrophysiological study at Hanoi Heart Hospital from 01/2019 to 6/2023. All these patients underwent 12-lead electrocardiogram, electrophysiological study. Result: 145 patients with RVOT-originated PVCs had the following characteristics: R wave in D2, D3, aVF, dominant S wave in aVR, aVL; Transitional position in V4 accounted for the highest rate of 60.7%, QRS time 136.7 ± 14.5ms. Patients in non-RVOT: Leads D2, D3 are positive, negative co-direction or opposite direction; 100% lead aVL positive; transition in V2, V3 accounted for 85.7%, QRS time 122 ± 15.5ms. Electrophysiological exploration PVCs from RVOT, almost cases was in the anterior wall, the septum and the low region of RVOT with the rates: 64.8%, 72.4%, 66.9%. Meanwhile, in the group non-RVOT, 7 patients all located tricuspid valve annulus (TVA), of which 6 cases in septum near His accounted for 85.7% and only 1 case on the lateral wall of TVA accounted for 14.3%. Conclusion: PVCs in RVOT has an R wave pattern at D2, D3, aVF that usually originates in the anterior wall, septum wall and lower region of the RVOT. The D2, D3 leads can be positive, negative co-directed, or opposite direction and mostly from the TVA near His.
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