GIÁ TRỊ HIỆU SỐ BIÊN ĐỘ SÓNG S VÀ SÓNG R TẠI CHUYỂN ĐẠO V1 VÀ V2 TRONG PHÂN BIỆT VỊ TRÍ RỐI LOẠN NHỊP THẤT KHỞI PHÁT TỪ ĐƯỜNG RA TÂM THẤT

Abstract

Objective: Orienting the diagnosis of the location of ventricular arrhythmias from the ventricular outflow tract, including the right ventricular outflow tract (RVOT) and left ventricular outflow tract (LVOT), can help electrophysiologists limit the time exposed to X-rays while also  the number of vascular accesses that must be used during the procedure. Results: The difference between the total amplitute S-R in lead V1 and V2 in the arrhythmia group originating from the LVOT was lower than the group originating from the RVOT (p < 0.001). The Cut-off value to predict the site of origin (calculated by analyzing the ROC curve) was: 1,604 mV (Sensitivity: 93%, specificity: 84.7%, positive diagnostic value: 85.3%, negative diagnostic value: 91.7%). The area under the curve (AUC) was 0.875 (p < 0.001). Conclusion: The difference between the total S-R amplitude of >1,6 mV is a valued ECG criterion to predict RVOT rather than LVOT origin.