The most probable explanation for the flip-flop phenomenon in the newborn is:
a. oxygen (O2) toxicity.
b. right-to-left shunting.
c. cardiac disease.
d. reactive pulmonary vasoconstriction.
ANS: D
When the FiO2 is increased to original levels, the PaO2 fails to improve, which is probably be-cause of reactive pulmonary vasoconstriction.
Health Professions
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