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Most cannulae can only provide oxygen at low flow rates—up to 5 litres per minute (L/min)—delivering an oxygen concentration of 28–44%. Rates above 5 L/min can result in discomfort to the patient, drying of the nasal passages, and possibly nose bleeds (epistaxis).
The traditional low flow system used for medical gas delivery is the Nasal cannula which is limited to the delivery of 1–6 L/min of oxygen or up to 15 L/min in certain types. This is because even with quiet breathing, the inspiratory flow rate at the nares of an adult usually exceeds 30 L/min.
A non-rebreather mask ( NRB, non-rebreather, non-rebreather facemask, etc.) is a device used in medicine to assist in the delivery of oxygen therapy. A NRB requires that the patient can breathe unassisted, but unlike a low-flow nasal cannula, the NRB allows for the delivery of higher concentrations of oxygen.
The simple face mask can deliver higher flow rates than nasal cannula (6–10 liters per minute) for an FiO2 of 30- 60% oxygen. Nasal cannula and simple face masks are described as low flow delivery systems. Unlike the non-rebreather and partial rebreather masks, the simple face mask lacks a reservoir bag.
Patients are given heated high-flow oxygen, a type of respiratory support often delivered through a nasal cannula. Treatment of this kind means they have very limited space for movement, and the ...
Heated humidified high-flow therapy, also known as high flow nasal cannula (HFNC) or high flow therapy (HFT), is a type of respiratory support that delivers a flow of medical breathing gas to a patient of up to 60 L/min and 100% oxygen through a large bore nasal cannula. originally used for neonates, it is also effective in some adults to treat ...