Table 4 Diagnostic value of different indexes for PVCs/VT originating from different sites of LVOT

Precordial leads transition < V3+Precordial leads transition index >0 diagnosis of the origin of LVOT

49/52(94.23)

95/104(91.35)

49/58(84.48)

95/98(96.94)

I lead present as type r or m to diagnose the origin of the right coronary sinus

6/9(66.67)

37/41(90.24)

6/10(60.00)

37/40(92.50)

R_II > R_III to diagnose the origin of the right coronary sinus

11/11(100.00)

33/41(80.49)

11/19(57.89)

33/33(100.00)

QS_aVR > QS_aVL to diagnosis the origin of the right coronary sinus

11/11(100.00)

33/41(80.49)

11/19(57.89)

33/33(100.00)

All V1–V6 present as one-way R wave to diagnose the origin of the under left coronary sinus

8/9(88.89)

43/43(100.00)

8/8(100.00)

43/44(97.73)

Inferior leads descending a notch to diagnose the origin of the under left coronary sinus

8/9(88.89)

43/43(100.00)

8/8(100.00)

43/44(97.73)