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A nurse is reviewing a client's cardiac rhythm strips and notes a constant P-R interval of
0.35 seconds. Which of the following dysrhythmias is the client displaying?

A.

Premature atrial complexes

B.

Complete heart block

C.

Atrial fibrillation

D.

First-degree atrioventricular block

Answer and Explanation

The Correct Answer is D

A.    Incorrect. Premature atrial complexes do not typically affect the P-R interval. They are characterized by an early P-wave followed by a QRS complex.
B.    Incorrect. Complete heart block is characterized by a dissociation between the P-waves and QRS complexes, resulting in no relationship between atrial and ventricular activity.
C.    Incorrect. Atrial fibrillation is characterized by chaotic and irregular atrial activity without distinct P-waves, making the P-R interval irrelevant.
D.    Correct. In first-degree atrioventricular block, the P-R interval is prolonged beyond the normal range of 0.12-0.20 seconds. A constant P-R interval of 0.35 seconds indicates a first- degree atrioventricular block.


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Related Questions

Correct Answer is D

Explanation

A. Incorrect. Postural drainage is usually performed multiple times a day, usually three to four times, to effectively mobilize respiratory secretions.
B. Incorrect. Percussions are typically performed using cupped hands to create vibrations. Holding the hand flat would not produce the desired effect.
C. Bronchodilator should be administered PRIOR to procedure if prescribed
D. Postural drainage should be performed before meals or at least 1-2 hours after meals to prevent vomiting or aspiration.

Correct Answer is B

Explanation

A. Cyanosis, a bluish discoloration of the skin, may be more visible in areas where the skin is thinner. The sacrum is not reliable especially in the dark colored individuals.
B. Palms of the hand is reliable site for assessing for cyanosis.
C. Incorrect. Shoulders are not a common location to assess for cyanosis. Areas with thinner skin, such as the lips, oral mucosa, and nail beds, are usually observed for cyanosis.
D. Incorrect. Areas of trauma are not specifically used to assess for cyanosis. Cyanosis is a clinical sign that indicates inadequate oxygenation of the blood.

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