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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 C

Explanation

Rationale:

A. Epinephrine is not typically used to treat supraventricular tachycardia (SVT).

B. Atropine is not typically used to treat supraventricular tachycardia (SVT).

C. Adenosine is the medication of choice for terminating supraventricular tachycardia (SVT).

D. Lidocaine is not typically used to treat supraventricular tachycardia (SVT).

A. Lanoxin increases the heart rate B. Lanoxin increases the force of cardiac contractions C. Lanoxin order should be questioned in this diagnosis. D. Lanoxin decreases the force of cardiac contractions

Correct Answer is B

Explanation

Rationale:

A. Lanoxin does not typically increase heart rate significantly.

B. Digoxin (Lanoxin) is a positive inotropic agent, meaning it increases the force of cardiac contractions.

C. Lanoxin is commonly used in the treatment of heart failure.

D. Lanoxin does not decrease the force of cardiac contractions.

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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?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

Correct Answer is C

Explanation

A nurse is caring for a client with heart failure (HF) and preparing to give a daily dose of Digoxin (Lanoxin). The nurse understands the rationale for giving this medication for HF is which of the following?

Correct Answer is B

Explanation

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