A patient is demonstrating second-degree heart block (Wenkebach [type I]). The nurse realizes this rhythm is characterized by:
1. Progressive lengthening of the PR interval until a QRS is dropped
2. Prolonged PR interval greater than 0.22
3. Complete disassociation of the atria and ventricles
4. Consistent PR interval with occasional dropped QRS complexes
1
Rationale 1: Second-degree AV block type I, or Wenkebach, is characterized by an inconsistent PR interval that progresses in length until a QRS is dropped. The SA node "resets" to the previous shortest PR interval and repeats progressive lengthening.
Rationale 2: The presence of a prolonged PR interval without dropped QRS is present with first-degree AV block.
Rationale 3: Complete disassociation is third-degree heart block.
Rationale 4: A consistent PR interval with occasional dropped QRS complexes is consistent with second-degree AV block type II.
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