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 D

Explanation

A. Complete heart block (third-degree AV block) is characterized by a complete dissociation between atrial and ventricular activity, with P waves and QRS complexes occurring independently of each other.
B. Sinus tachycardia presents with a regular rhythm, a heart rate above 100 beats per minute, and distinct P waves preceding each QRS complex.
C. Idioventricular rhythm occurs when the heart's primary pacemakers fail, leading to a slow ventricular rate (usually 20-40 bpm) with wide QRS complexes and no preceding P waves.
D. Ventricular tachycardia (VT) is a life-threatening arrhythmia characterized by a rapid ventricular rate (typically >100 bpm), wide QRS complexes, and an absence of P waves. VT can be sustained or non-sustained and may require immediate intervention if the patient is unstable.

A. Osler Nodes B. Splinter Hemorrhages C. Petechial Hemorrhaging D. Janeway Lesions E. Fever with Chills

Correct Answer is ["A","B","C","D","E"]

Explanation

A. Osler Nodes – These are tender, painful nodules on the fingers and toes, a classic sign of infective endocarditis.
B. Splinter Hemorrhages – Tiny blood clots under the fingernails occur due to microembolization from infected heart valves.
C. Petechial Hemorrhaging – Small red or purple spots on the skin or mucous membranes occur due to embolization of infected material.
D. Janeway Lesions – Painless, flat, red spots on the palms and soles caused by microemboli.
E. Fever with Chills – A common systemic symptom due to infection and inflammation.

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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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