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 A
Explanation
A. The newborn’s head is a major source of heat loss due to the large surface area and insufficient
insulation. Covering the head helps maintain body temperature.
B. While the head can be reshaped, the primary reason for covering it is to prevent heat loss, not reshaping.
C. The head is not necessarily wet and doesn't require drying in all cases, making this less relevant.
D. Although the head has large fontanels, this is not the reason it is covered with a cap; preventing heat loss is the priority.
Correct Answer is D
Explanation
A. A murmur or swishing sound does not correspond to the diastolic pressure; it is more indicative of turbulent blood flow.
B. Clear tapping sounds are heard at systolic pressure but do not indicate diastolic pressure.
C. Knocking sounds are associated with systolic pressure, not diastolic.
D. The muffling sound heard after the first Korotkoff sounds indicates the diastolic pressure in children and some adults, which is the correct method for assessing the diastolic reading.
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