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Calculating the Vectorcardiography Leads from the 12 Lead ECG in Pediatric Patients Using the Matrix Inversion (Inverse Dower) Technique

Description

The orthogonal leads X, Y and Z used in vectorcardiography can be calculated in children from the 12-lead ECG using the inverted matrix technique. Since in children lead V4R may be used instead of V3, a different set of transfer coefficient must be used.


 

 

V4R

V1

V2

V4

V5

V6

I

II

X

-0.128

-0.122

0.009

0.275

0.251

0.185

0.160

0.013

Y

0.073

0.019

-0.087

-0.065

0.025

0.051

-0.235

0.891

Z

0.072

0.278

0.439

0.189

0.016

-0.084

0.023

-0.128

 

X in mV =

= (-0.122 * V1) + (0.009 * V2) - (0.128 * V4R) + (0.275* V4) + (0.251 * V5) + (0.185 * V6)+ (0.160 * I) + (0.013 * II)

 

Y in mV =

= (0.019 * V1) - (0.087 * V2) + (0.073 * V4R) - (0.065 * V4) + (0.025 * V5) + (0.051 * V6) - (0.235 * I) + (0.891 * II)

 

Z in mV =

= (0.278 * V1) + (0.439 * V2) + (0.072 * V4R) + (0.189 * V4) + (0.016 * V5) - (0.084 * V6) + (0.023 * I) - (0.128 * II))

 

where:

• Each of the 12-lead leads is in mV.

• 1 mm = 0.1 mV

 


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