Which two adjustments are typically made to reduce oxygen exposure during HFOV?

Which two adjustments are typically made to reduce oxygen exposure during HFOV?

• A. Increase FiO2 and MAP
• B. Decrease FiO2 and MAP
• C. Increase FiO2 and PEEP
• D. Decrease FiO2 and PEEP

Answer: (B)

In HFOV, oxygenation is controlled mainly by two settings: the fraction of inspired oxygen (FiO2) and the mean airway pressure (MAP). Lowering FiO2 reduces the amount of oxygen the patient inhaled, directly cutting oxygen exposure. Reducing MAP lowers overall airway oxygen delivery and the alveolar oxygen exchange, further limiting oxygen exposure while still needing careful monitoring to avoid derecruitment or hypoxemia. Other adjustments would either increase oxygen delivery (raising FiO2 or MAP) or involve a parameter not used in HFOV for this purpose (PEEP), so decreasing both FiO2 and MAP is the standard way to minimize oxygen exposure during HFOV.

In HFOV, oxygenation is controlled mainly by two settings: the fraction of inspired oxygen (FiO2) and the mean airway pressure (MAP). Lowering FiO2 reduces the amount of oxygen the patient inhaled, directly cutting oxygen exposure. Reducing MAP lowers overall airway oxygen delivery and the alveolar oxygen exchange, further limiting oxygen exposure while still needing careful monitoring to avoid derecruitment or hypoxemia. Other adjustments would either increase oxygen delivery (raising FiO2 or MAP) or involve a parameter not used in HFOV for this purpose (PEEP), so decreasing both FiO2 and MAP is the standard way to minimize oxygen exposure during HFOV.