Which statement regarding pulse oximetry is false?
a. It measures arterial oxyhemoglobin saturation.
b. A reading of 90% or less is normal.
c. False high readings are found in cigarette smokers.
d. A probe should not be placed over a fingernail with polish.
ANS: B
A pulse oximeter measures arterial oxyhemoglobin saturation. The pulse oximeter reading should remain over 95%; cigarette smokers have false high readings because carboxyhemoglobin (carbon dioxide), which closely resembles oxyhemoglobin, can be perceived by the sensor to be oxygenated. For accuracy, avoid placing the sensor over an area with fingernail polish.
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Properties of dressing: Does not prevent movement of air though itself
a. Absorbent b. Nonabsorbent c. Nonadherent d. Nonocclusive