Rhenis Nursing Rhenis Nursing
ATI Med- Surg Nurs 300 Exam (1)
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Hint : 🧩Think of consistently delayed conduction without missed beats.

Correct Answers:

  • 1st degree AV block


Rationale :

💁‍♂️A PR interval of 0.28 seconds is prolonged beyond the normal 0.12–0.20 seconds, indicating a first-degree AV block.

📈This rhythm is regular and all impulses are conducted, just delayed, showing a prolonged PR interval without dropped beats.

🚫A Mobitz II block would present with dropped QRS complexes, which is not noted here.

🧠Atrial flutter and sinus bradycardia present with different rhythm characteristics unrelated to PR interval prolongation.

📌Core Message

A prolonged PR interval without missed beats indicates a first-degree AV block.

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