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?

R-R is irregular

There are absent P waves

PR interval greater than 0.20 seconds in duration.

The PR interval gets longer then drops.

Answer and Explanation

The Correct Answer is C

A. First-degree heart block has a regular R-R interval, meaning the rhythm is typically regular.
B. The presence of P waves is a distinguishing feature of first-degree heart block. Absent P waves are more characteristic of atrial fibrillation or junctional rhythms.
C. First-degree heart block is characterized by a prolonged PR interval greater than 0.20 seconds, but all impulses are still conducted to the ventricles.
D. A progressively lengthening PR interval followed by a dropped QRS complex is indicative of second-degree Mobitz Type I (Wenckebach) heart block, not first-degree heart block.

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Correct Answer is B

Explanation

A. Lidocaine is used for ventricular arrhythmias, not supraventricular tachycardia (SVT).
B. Adenosine is the first-line treatment for stable SVT, as it temporarily blocks AV node conduction, allowing the heart to reset into a normal rhythm. It is given as a rapid IV push.
C. Atropine increases heart rate and is used for bradycardia, not tachycardia.
D. Epinephrine stimulates the heart and is used for asystole and severe bradycardia, not SVT.

A. Initiate external pacing. B. Initiate CPR. C. Defibrillation. D. Synchronized cardioversion.

Correct Answer is D

Explanation

A. External pacing is not indicated for ventricular tachycardia with a pulse. Pacing is typically used for bradyarrhythmias.
B. CPR is only necessary if the client is pulseless. Since the client has a pulse, a more appropriate intervention is needed.
C. Defibrillation is used for pulseless VT or ventricular fibrillation, but this client has a pulse and is symptomatic.
D. Synchronized cardioversion is the appropriate intervention for unstable ventricular tachycardia with a pulse. The shock is synchronized to the R wave to prevent inducing ventricular fibrillation.

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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 B

Explanation

Correct Answer is D

Explanation

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