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Table 6 The relationship between the amplitude of r(R) or s(S) or QS in12-lead ECG and clock’s position of the origin of PVC/VT

From: Idiopathic premature ventricular contractions and ventricular tachycardias originating from the vicinity of tricuspid annulus: Results of radiofrequency catheter ablation in thirty-five patients

Leads

Amplitude of r(R)

Amplitude of s(S) or QS

r value

p value

r value

p value

I

−0.4565

<0.02

/

/

II

0.8131

<0.001

−0.5301

<0.005

III

0.7264

<0.001

−0.8328

<0.001

aVR

/

/

−0.5590

<0.01

aVL

−0.6601

<0.001

/

/

aVF

0.8128

<0.001

−0.7405

<0.001

V1

−0.0459

>0.05

0.1178

>0.05

V2

−0.1120

>0.05

0.1451

>0.05

V3

−0.2526

>0.05

0.1193

>0.05

V4

0.0840

>0.05

0.2819

>0.05

V5

0.1418

>0.05

/

/

V6

0.3955

<0.05

/

/

  1. Bivariate correlations analysis fit a straight line to the positive relationship between the amplitude of r or R in inferior leads(II, III and aVF) and clock’s position of the origin of PVCs/IVTs in LAO ( from 6 to 12 o’clock); negative relationship between the amplitude of s or S in inferior leads (II, III and aVF) and clock’s position (from 6 to 12 o’clock).