A nurse is asked to record preductal and postductal oxygen saturations on an infant with possible persistent pulmonary hypertension. Where does the nurse assess the preductal saturation?
A.
Earlobe
B.
Left finger
C.
Left great toe
D.
Right finger
ANS: D
Measuring the preductal (right radial) pulse oximetry and comparing it to the postductal (left radial) can help diagnose persistent pulmonary hypertension. A difference of 5% or more demonstrates the right-to-left shunt that this condition produces.
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