Advanced Cardiovascular Life Support (ACLS) Practice Exam

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What type of second-degree AV block is characterized by dropped beats without a progressive lengthening of the PR interval?

  1. Second degree AV block Type 1 Wenckebach

  2. Second degree AV block Mobitz Type 2

  3. Atrial flutter

  4. Fine ventricular fibrillation

The correct answer is: Second degree AV block Mobitz Type 2

The type of second-degree AV block characterized by dropped beats without a progressive lengthening of the PR interval is indeed Mobitz Type 2. In this form of AV block, the PR intervals remain constant before a dropped beat occurs, distinguishing it from other types of AV blocks. In Mobitz Type 2, the reoccurrence of the blocked beat is less predictable, and the electrical impulses do not manage to pass through the AV node, leading to a failure of ventricular contraction while the atrial impulses continue to fire normally. This block can lead to more significant interruptions in normal heart rhythms and can be more dangerous than type 1, which is characterized by progressively lengthening PR intervals before a dropped beat. Identifying this type of block is crucial in clinical settings since Mobitz Type 2 often necessitates more urgent medical intervention, such as pacing, as it may progress to complete heart block.

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