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: Avoiding tanning booths is correct and does not indicate a need for further teaching.
Choice B reason: Using sunscreen even on cloudy days is correct and does not indicate a need for further teaching.
Choice C reason: Checking the skin monthly for any changes is correct and does not indicate a need for further teaching.
Choice D reason: The statement about eating a high-fiber diet reducing the risk for developing skin cancer indicates a misunderstanding, as there is no direct correlation between a high-fiber diet and the prevention of skin cancer. This indicates a need for further teaching.
Correct Answer is C
Explanation
Choice A reason: An RBC count of 4,500,000/mL is within the normal range and would not typically cause symptoms of anemia.
Choice B reason: Normal RBC indices do not indicate anemia and would not explain the symptoms.
Choice C reason: A hemoglobin level of 8.2 g/dL is below the normal range and would be consistent with symptoms of anemia such as fatigue and palpitations.
Choice D reason: A hematocrit of 38% is within the normal range for adult males and would not typically be associated with anemia symptoms.
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