The normal PR interval is:
0.04-0.20 seconds
0.12-0.20 seconds
Less than half the R-to-R ratio
0.08-0.10 seconds
The Correct Answer is B
Choice A reason: A PR interval of 0.04-0.20 seconds is too broad and includes values that are both below and above the normal range.
Choice B reason: A PR interval of 0.12-0.20 seconds is the established normal range for adults, reflecting proper conduction through the AV node.
Choice C reason: The PR interval being less than half the R-to-R ratio is not a standard measurement for PR intervals and does not provide a specific range.
Choice D reason: A PR interval of 0.08-0.10 seconds is below the normal range and may suggest pre-excitation or an AV nodal (junctional) rhythm.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A reason: Packed RBCs should be transfused as soon as possible once the nurse has prepared everything necessary for the transfusion.
Choice B reason: Waiting 2 hours after obtaining the blood is not necessary and could delay needed treatment.
Choice C reason: The client's mealtime should not delay the transfusion of blood, which is a time-sensitive medical treatment.
Choice D reason: While the client's readiness is important, it should not unduly delay the transfusion if the client is medically stable and the transfusion is necessary.
Correct Answer is B
Explanation
Choice A reason: Requesting a job that requires sitting all day does not reflect an understanding of correct body mechanics or how to manage chronic back pain through activity.
Choice B reason: Beginning exercises to strengthen the lower back indicates that the patient understands the importance of muscle strength in supporting the spine and preventing back pain.
Choice C reason: Keeping the back straight while lifting is important, but the statement about lifting "heavy objects above my waist" suggests a misunderstanding, as lifting objects above the waist increases the risk of back injury.
Choice D reason: Sleeping with knees and back extended is not recommended for preventing back pain. It is better to sleep with knees slightly bent to maintain the natural curve of the spine.
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