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The nurse is reviewing a patient's electrocardiogram (ECG) tracing. Which of the following are characteristics of normal sinus rhythm (NSR?

A.

QRS interval less than or equal to 0.10 seconds

B.

Heart rate 50-100 bpm

C.

P waves are rounded and inverted, and follow each QRS complex

D.

PR interval 0.34 to 0.43 seconds

Answer and Explanation

The Correct Answer is B

A.    The QRS interval may vary but is typically less than 0.12 seconds in normal sinus rhythm.
B.    Normal sinus rhythm typically has a heart rate between 50 and 100 beats per minute.
C.    In normal sinus rhythm, P waves are typically upright and precede each QRS complex.
D.    The PR interval may vary but is typically between 0.12 and 0.20 seconds in normal sinus rhythm.


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Related Questions

Correct Answer is C

Explanation

A. Lemon-glycerin swabs can dry out and irritate oral tissues, increasing the risk of oral mucositis and infection.
B. Using a firm toothbrush may be too harsh for irritated mucous membranes and can increase the risk of injury and bleeding.
C. Gentle oral care is essential to avoid further irritation of the mucous membranes.

D. Flossing may be too abrasive for irritated mucous membranes and can increase the risk of bleeding and injury.

Correct Answer is C

Explanation

A. While a splenectomy can lead to increased workload on the liver, it does not directly predispose the patient to liver disease.
B. A history of splenectomy does not specifically increase the risk of lupus.

C. Patients who have undergone splenectomy are at increased risk of certain infections, particularly encapsulated bacteria such as Streptococcus pneumoniae, which can cause pneumonia.
D. A history of splenectomy does not directly increase the risk of renal disease.

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