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.

Answer and Explanation

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.

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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.

A. pump up the cuff until no sound is heard and then let the air out. B. stop midway and begin to inflate again. C. make sure the bell of the stethoscope is placed firmly over the artery. D. continue to listen until the cuff is deflated.

Correct Answer is D

Explanation

Rationale
A. Pumping the cuff until no sound is heard may cause inaccurate readings and is not a proper technique.
B. Stopping midway can result in missing sounds or causing an inaccurate measurement.

C. The bell of the stethoscope should be used for low-pitched sounds, but the key is to continue listening to identify the full Korotkoff sound range, especially in the presence of an auscultatory gap.
D. It is important to continue listening until the cuff is deflated to ensure the accurate measurement of both systolic and diastolic pressures, particularly in patients with an auscultatory gap.

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