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A nurse is reviewing cardiac rhythms and heart blocks for a critical care course. The nurse is aware that which of the following describes first degree heart block?

The PR interval gets longer then drops.

PR interval greater than 0.20 seconds in duration

There are absent P waves

R-R is irregular

Answer and Explanation

The Correct Answer is B

Rationale:

A. This describes a second-degree heart block, specifically Mobitz Type I (Wenckebach).

B. A PR interval greater than 0.20 seconds is characteristic of first-degree heart block.

C. This describes third-degree heart block, also known as complete heart block.

D. An irregular R-R interval is not specific to first-degree heart block.

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Correct Answer is D

Explanation

Rationale:

A. Nitroglycerin does not interact with contrast material.

B. Carvedilol does not interact with contrast material.

C. Atorvastatin does not interact with contrast material.

D. Metformin can interact with contrast material and increase the risk of acute kidney injury. It is typically held before and after procedures involving contrast material.

A. Reduce Blood pressure until patient is asymptomatic B. Reduce the blood pressure to normal over a period of hours. C. Reduction of blood pressure to normal over a period of days D. Reduction of blood pressure by 50% in the first hour.

Correct Answer is D

Explanation

Rationale:

A. Reducing blood pressure until the patient is asymptomatic is not specific and may not be achievable or safe.

B. Reducing the blood pressure to normal over a period of hours may be too slow for a hypertensive emergency.

C. Reducing blood pressure to normal over a period of days is too slow for a hypertensive emergency.

D. The goal in a hypertensive emergency is to reduce blood pressure by 25% to 30% within the first hour, with the ultimate goal of a reduction of 50% in the first hour.

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A nurse is reviewing cardiac rhythms and heart blocks for a critical care course. The nurse is aware that which of the following describes first degree heart block?

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Naxlex Comprehensive Predictor Exams

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Explanation

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Correct Answer is D

Explanation

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