type II AV block

type II AV block

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Unlike Mobitz Type I second-degree AV block in which the PR interval progressively lengthens, the PR interval for the conducted beats (those followed by a QRS) in Mobitz Type II AV block is constant (0.
Mobitz Type II AV block can occur from age-related degeneration of the conduction system, myocardial ischemia or infarction, or as a result of drugs that block the AV node (e.
When every other P-wave is not followed by a QRS complex in second-degree AV block (the impulse does not conduct through to the ventricle), it is not possible to differentiate Mobitz Type I from Mobitz Type II AV block using a rhythm strip.
This patient's electrocardiogram revealed a Type II AV block at 5am (Figure 2).