Neonatal Nurse Practitioner Practice Exam

How can O2 levels be decreased in HFJV and CV settings?

1. By increasing Fio2

2. By decreasing MAP

3. By increasing MAP

4. By decreasing Fio2

The correct answer is: By decreasing Fio2

In the context of High-Frequency Jet Ventilation (HFJV) and conventional ventilation settings (CV), oxygen (O2) levels can be managed by adjusting the fraction of inspired oxygen (Fio2). Decreasing Fio2 reduces the concentration of oxygen that the patient inhales, which in turn can lower the overall oxygen levels in the bloodstream, especially in cases where the oxygen saturation is too high or where there is an attempt to promote weaning off supplemental oxygen. In neonatal care, particularly in patients with conditions like bronchopulmonary dysplasia or those recovering from respiratory distress syndrome, careful management of oxygen levels is crucial. On the other hand, increasing mean airway pressure (MAP) typically enhances lung recruitment and improves ventilation, which may counteract the effects of reducing Fio2 by facilitating better gas exchange. Thus, decreasing Fio2 is an important strategy to lower O2 levels when necessary. The other options would not effectively facilitate a decrease in O2 levels. For example, increasing Fio2 leads to higher oxygen levels, which is counterproductive, and altering MAP without a clear strategy would not directly influence oxygen concentration in a predictable manner.