The nurse is reviewing a patient's electrocardiogram (ECG) tracing. Which of the following are characteristics of normal sinus rhythm (NSR?
QRS interval less than or equal to 0.10 seconds
Heart rate 50-100 bpm
P waves are rounded and inverted, and follow each QRS complex
PR interval 0.34 to 0.43 seconds
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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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. While vitamin K plays a role in immune function, its administration prior to surgery primarily aims to correct potential clotting abnormalities rather than prevent infection.
B. Vitamin K does not affect gastric secretions. Its role in this context is unrelated to gastric function.
C. While vitamin K is involved in various physiological processes, its administration prior to surgery is primarily aimed at preventing bleeding complications by ensuring adequate clotting factor synthesis.
D. Vitamin K is essential for the synthesis of clotting factors in the liver.
Administering vitamin K prior to surgery helps ensure adequate levels of clotting factors, reducing the risk of bleeding during and after the procedure.
Correct Answer is C
Explanation
A. Nylon underwear can trap moisture and promote bacterial growth, increasing the risk of UTIs. Cotton underwear is recommended for better ventilation.
B. Delaying voiding can increase the risk of UTIs by allowing bacteria to multiply in the bladder. Voiding regularly and completely is important for flushing out bacteria.
C. Cranberry juice contains compounds that may help prevent UTIs by preventing bacteria from adhering to the urinary tract lining.
D. Douching can disrupt the natural balance of bacteria in the vagina and increase the risk of UTIs and other infections.
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