Typically, a NHF system will comprise a 1) gas blender, 2) flow meter display 3) nasal interface and heated circuit and 4) humidification system. 6 During NHF therapy at a flow rate sufficient to satisfy the patients inspiratory flow demand, the concentration of oxygen delivered will accurately reflect F IO 2 since there will be little to no entrainment of room air diluting the delivered gas. However, during increase effort or acute distress if a patient’s spontaneous inspiratory flow rate is 45 liters per minute or greater, then NHF therapy must deliver gas flow to the patient that meets or exceeds this flow. At rest during tidal breathing, an inspiratory flow rate of between 20-30 liters per minute (LPM) may be expected. 5 Inspiratory flow demand is the flow rate at which a patient inhales, and when NHF flow rate exceeds the peak inspiratory flow rate all inspired gas is received via the high flow cannula. Standardization and consistent use of appropriate terminology in literature and educational publications will improve understanding of therapeutic indications for nasal high flow therapy.Ī requirement for therapies purporting to deliver “High Flow” is to deliver sufficient gas flow to meet or exceed each patient’s inspiratory flow demand. heated, humidified, nasal cannula, oxygen). ![]() 1 – 4 Published nomenclature for NHF therapy often utilize or include one of a dozen permutations of discretionary terms that refer to various attributes of providing support (i.e. Nasal High Flow Therapy (NHF) has become a first line mode for respiratory support in patients with hypoxemic respiratory failure.
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