Table 3 Differential diagnostic value of standard ECG in identifying the origin of outflow tract PVCs having qrS or QS pattern with notching on the downward deflection in V1 (n, %)
ECG indicators | Sensitivity | Specificity | Positive predictive value | Negative predictive value |
|---|---|---|---|---|
Precordial lead transitional zone index <0, LVOT origin [12] | 22/23(95.65) | 25/26(96.15) | 22/23(95.65) | 25/26(96.15) |
Precordial lead transitional zone ≤ V3, LVOT origin | 20/23(86.96) | 16/26(61.54) | 20/28(66.67) | 16/19(84.21) |
Lead V2 R wave Duration index > 50% R/S amplitude index > 30%, LVOT origin | 18/23(78.26) | 23/26(88.46) | 18/21(85.71) | 23/28(82.14) |
r, m,R or Rs wave in lead I, LCC-RCC or RCC origin | 17/18(94.44) | 3/5(60.00) | 17/19(89.47) | 3/4(75.00) |