A 60 kg (132 lb) female patient with congestive heart failure is receiving NPPV with an IPAP of 16 cm H2O, EPAP of 10 cm H2O, and FIO2 of 0.70. Available laboratory data includes: pH 7.40, PaCO2 42 torr; PaO2 145 torr; HCO3 26 mEq/L, SaO2 99%, CVP 10 cm H2O. Breath sounds reveal a few fine bibasilar crackles. This situation should be described as
A. shunting.
B. hypoventilation.
C. hyperoxygenation.
D. fluid overload.
Answer: C. hyperoxygenation.
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