Electrocardiogram features of premature ventricular contractions/ventricular tachycardia originating from the left ventricular outflow tract and the treatment outcome of radiofrequency catheter ablation

BMC Cardiovascular Disorders

Jia-Feng Lin²  Ri-Peng Yin²  Yue-Chun Li²  Jia Li²  Hai-Ge Ye¹  Kang-Ting Ji²  Bei Ge² 

[1] Department of Hematology, First Affiliated Hospital of Wenzhou Medical College, Wenzhou, China;Department of Cardiology, Second Affiliated Hospital of Wenzhou Medical College, 109 Xueyuan Road, Wenzhou, Zhejiang, China

关键词: Radiofrequency current;    Catheter ablation;    Left ventricular outflow;    Ventricular arrhythmia;    Electrophysiology;   

Others  :  857969
DOI  :  10.1186/1471-2261-12-112

 received in 2012-06-15, accepted in 2012-11-20,  发布年份 2012

【 摘 要 】

Background

Radiofrequency catheter ablation (RFCA) has been used for the ablation of premature ventricular contractions (PVCs) or ventricular tachycardia (VT). To date, the mapping and catheter ablation of the arrhythmias originating from the left ventricular outflow tract (LVOT) has not been specified. This study investigates the electrocardiogram (ECG) feature of PVCs or VT originating from the LVOT. Moreover, the treatment outcome of RFCA is analyzed.

Methods

Mapping and ablation were performed on the supravalvular or subvalvular aorta in 52 cases with PVCs/VT originating from the LVOT. The data were compared with those from 104 patients with PVCs/VT originating from the right ventricular outflow tract (RVOT). A differential procedure was prepared based on the comparison of the ECG features of PVCs/VT originating from the RVOT, LVOT, and their different parts.

Results

Among 52 cases with PVCs originating from the LVOT, 47 were successfully treated by RFCA, with a success rate of 90.38%. Several differences among the 12-lead ECG features were observed from the RVOT and LVOT in the left and right coronary sinus groups, as well as under the left coronary sinus group (left fibrous trigone): (1) If the precordial leads transition 0 are considered as the diagnostic parameters of PVCs/VT originating from the LVOT, then the sensitivity, specificity, as well as positive and negative predictive values are 94.12%, 93.00%, 87.27%, and 96.88%, respectively; (2) The analysis of different subgroups of the LVOT are as follows: (a) A mainly positive wave of r or m pattern was recorded in the lead I in 72.73% of patients in the right coronary sinus group, versus 12.90% of patients in the left coronary sinus group, and 0% in the under left coronary sinus group. (b) All patients in the right coronary sinus group presented waves of R_II>R_III and QS_aVR>QS_aVL, whereas most patients in the other two groups showed waves of R_III>R_II and QS_aVL>QS_aVR. (c) Most patients in the under left coronary sinus group in lead V1 had a mainly positive wave (R) (77.78%), whereas those in the right (81.82%) and left (62.50%) coronary sinus groups had mainly negative waves (rS).

Conclusions

RFCA is a safe and effective curative therapy for PVCs/VT originating from the LVOT. The 12-lead ECG features of the LVOT from different origins exhibit certain distinctions.

【 授权许可】

   
2012 Ge et al.; licensee BioMed Central Ltd.

【 图 表 】

【 参考文献 】

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