| Rate | variable |
| P wave | normal with constant P-P intervals |
| QRS | usually widened because this is usually associated with a bundle branch block. |
| Conduction | P-R interval may be normal or prolonged, but it is constant until one P wave is not conducted to the ventricles. |
| Rhythm | usually regular when AV conduction ratios are constant |
This block usually occurs below the Bundle of His and may progress into a higher degree block.
It can occur after an acute anterior MI due to damage in the bifurcation or the bundle branches.
It is more serious than the type I block.
Treatment is usually artificial pacing.
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