Table 4: Diagnostic criteria for left anterior bundle block.
1. |
Frontal plane axis between -45° and -90°. |
2. |
qR pattern in lead aVL. |
3. |
R-peak time in lead aVL of 45 ms or more. |
4. |
QRS duration less than p95 or 120 ms. |
These criteria do not apply to patients with congenital heart disease in whom left-axis deviation is present in infancy. |