What is the relationship between oxygen flow rate and FiO2?

The correct answer highlights the direct relationship between oxygen flow rate and the fraction of inspired oxygen (FiO2). When the flow rate of supplemental oxygen is increased, the amount of oxygen that a patient inhales also increases, thereby raising the FiO2.

Oxygen therapy aims to ensure that patients receive adequate levels of oxygen to meet their physiological needs. When the flow rate is higher, more oxygen is delivered directly to the airway, which increases the concentration of oxygen in the inhaled air, thus increasing the FiO2.

In clinical practice, various delivery mechanisms such as nasal cannulas or face masks have specific flow rate ranges that correlate with expected FiO2 levels. Higher flow rates, provided they are within safe and prescribed limits, typically enhance the overall oxygenation of the patient, making the relationship crucial for effective respiratory management. This understanding helps healthcare providers adjust oxygen delivery to meet patient needs appropriately.