Pathophysiology
Clinical meaning
Oxygen delivery devices are classified as low-flow (nasal cannula, simple mask, non-rebreather) or high-flow (Venturi mask, high-flow nasal cannula) systems. Low-flow systems deliver supplemental O2 that mixes with room air during inspiration, so the actual FiO2 varies with the patient's respiratory pattern. High-flow systems provide all or most of the patient's inspiratory flow, delivering a more consistent FiO2. Proper setup and maintenance of equipment ensures safe and effective oxygen delivery.