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 D
Explanation
Choice A reason: Muscle dysfunction can be a consequence of COPD due to decreased activity levels, but it is not a risk factor for developing COPD.
Choice B reason: Poor nutrition can affect the overall health of individuals with COPD but is not a direct risk factor for developing the disease.
Choice C reason: Weight loss can occur in advanced stages of COPD due to increased energy expenditure from breathing difficulties, but it is not a risk factor for developing COPD.
Choice D reason: Increased risk for pneumonia is a direct risk associated with COPD, as the disease can compromise the respiratory system's ability to clear infections.
Correct Answer is C
Explanation
Choice A reason: Right arm muscle spasms may be uncomfortable but are not as critical as circulatory issues.
Choice B reason: A temperature of 99.9°F (37.7°C) is slightly elevated but not immediately alarming post-surgery.
Choice C reason: Loss of the right radial pulse could indicate a serious complication such as compartment syndrome, which requires urgent atention.
Choice D reason: Pain with arm movement is expected post-surgery but is not as urgent as loss of pulse.
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