Which of the following conditions is associated with a lack of response to increased FiO2 in pa-tients receiving positive-pressure ventilation?
a. Dead space
b. Shunt
c. Hypoxemia
d. Hypoventilation
ANS: B
If the patient is receiving mechanical ventilation and has adequate alveolar ventilation, failure of the PaO2 to respond to increased FiO2 likely means that the hypoxemia is due to diffusion defect or shunt.
Health Professions
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