The orthogonal leads X, Y and Z used in vectorcardiography can be calculated in adults from the 12-lead ECG using the inverted matrix technique. This method is also called the "inverse Dower" technique.
|
V1 |
V2 |
V3 |
V4 |
V5 |
V6 |
I |
II |
X |
-0.172 |
-0.074 |
0.122 |
0.231 |
0.239 |
0.194 |
0.156 |
-0.010 |
Y |
0.057 |
-0.019 |
-0.106 |
-0.022 |
0.041 |
0.048 |
-0.227 |
0.887 |
Z |
0.229 |
0.310 |
0.246 |
0.063 |
-0.055 |
-0.108 |
-0.022 |
-0.102 |
X in mV =
= (-0.172 * V1) - (0.074 * V2)+(0.122 * V3) + (0.231* V4) + (0.239 * V5) + (0.194 * V6)+ (0.156 * I) - (0.010 * II)
Y in mV =
= (0.057 * V1) - (0.019 * V2) - (0.106 * V3) - (0.022 * V4) + (0.041 * V5) + (0.048 * V6) - (0.227 * I) + (0.887 * II)
Z in mV =
= (0.229 * V1) + (0.310 * V2) + (0.246 * V3) + (0.063 * V4) - (0.055 * V5) - (0.108 * V6) - (0.022 * I) - (0.102 * II))
where:
• Each of the 12-lead leads is in mV.
• 1 mm = 0.1 mV
Specialty: Cardiology