Abstract：Objective To explore the ECG characteristics of premature ventricular contraction(PVC) and their location value for outflow tract originated PVC. Methods Retrospective analysis was performed on the figures of 68 successfully ablated cases with right ventricular outflow tract (RVOT) PVC or left ventricular outflow tract (LVOT) PVC. We measured R/S value of precordial leads, switch site of R/S, QRS complex duration of V2 lead, amplitude and duration indices of R wave in V2 lead, and then discussed the relationship between each of the above index and radiofrequency ablation target. Results There was no significant difference in general circumstances between 54 RVOTPVC and 14 LVOT-PVC patients. The duration of RVOT-PVC was shorter than that of LVOTPVC(P＜0.05). There were 12 cases with R/S switch in V1-V2 lead, including 11 LVOT-PVC ones with a specificity of 91.67% and a sensibility of 78.57%; there were 24 cases with R/S switch in V3 lead, including 21 RVOT-PVC ones with a specificity of 87.50% and a sensibility of 38.89%; there were 32 RVOTPVC cases with R/S switch in V4-V6 lead with a specificity of 100% and a sensibility of 59.26%. The location value of amplitude and duration indices of R wave in V2 lead for RVOT-PVC was low than that for LVOTPVC(P＜0.05). Conclusion R/S switch has greater diagnostic value for LVOT-PVC in or before V2 lead and for RVOT-PVC in or before V4 lead. When R/S switches in V2-V3 lead, the three indices of QRS complex duration, R wave duration index and R wave amplitude index of V2 lead play important roles in identifying the origin sites of PVC.
孙卫红, 李文华. 流出道起源室性早搏心电图特征及其对射频消融靶点的判断价值[J]. 实用心电学杂志, 2016, 25(3): 196-200.
SUN Wei-Hong, LI Wen-Hua. ECG characteristics of outflow tract originated premature ventricular contraction and their location value for radiofrequency ablation target. JOURNAL OF PRACTICAL ELECTROCARDIOLOGY, 2016, 25(3): 196-200.
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