The nurse explains to a patient that the pulse oximeter can measure the arterial oxygen by:
measuring the oxygenated hemoglobin through a capillary bed.
assessing the amount of blood passing through the sensor.
assessing the relative warmth of the skin on the monitored part.
measuring the respirations to the blood pressure via infrared rays.
The Correct Answer is A
A. Pulse oximetry works by using light absorption to measure the oxygen saturation of hemoglobin in the blood, which typically occurs through the capillary bed in areas like the finger or earlobe.
B. The pulse oximeter does not measure the amount of blood passing through the sensor directly, but rather the oxygen content of the blood.
C. The pulse oximeter does not assess the warmth of the skin as a mechanism for measuring oxygenation.
D. Pulse oximeters measure oxygen saturation levels, not the respiratory rate or blood pressure.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Rinsing the thermometer with water is not necessary to ensure an accurate reading. The thermometer should be cleaned after use but rinsing with water does not directly ensure accuracy.
B. Using a dry cotton ball to dry the thermometer is unnecessary and could leave fibers on the device that may interfere with reading accuracy.
C. Wiping the thermometer with alcohol helps sanitize it but does not directly influence the accuracy of the reading.
D. Shaking down the galinstan alloy to below normal is necessary to reset the thermometer before use, ensuring that the mercury level is accurate when taking a new temperature.
Correct Answer is ["A","C"]
Explanation
A. A dialysis shunt requires careful monitoring to avoid damaging the shunt, and blood pressure cuffs should not be applied to the arm with a shunt.
B. A hand amputation does not affect the use of the blood pressure cuff, but care should be taken with the affected area.
C. A previous mastectomy increases the risk of lymphedema, and using a blood pressure cuff on the affected arm could exacerbate this.
D. A patent IV line is not a contraindication for blood pressure measurement, but the nurse should take care not to interfere with the IV.
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