Second Degree AV Block (Mobitz type II)


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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