Emergency Medicine Book


Low Flow Oxygen

Aka: Low Flow Oxygen, Low Oxygen Delivery, Nasal Cannula, FIO2 Delivered by Nasal Cannula
  1. See Also
    1. Oxygen Delivery
    2. High Flow Nasal Cannula
  2. Preparations: Nasal Cannula
    1. Two short plastic nasal prongs
    2. Delivers 25-45% FIO2 at 1-6 L/min flow
    3. Delivers 4% Oxygen per liter flow
      1. Flow 0 liters per minute: 21% FIO2 (Room Air)
      2. Flow 1 liters per minute: 24 to 25% FIO2
      3. Flow 2 liters per minute: 28 to 29% FIO2
      4. Flow 3 liters per minute: 32 to 33% FIO2
      5. Flow 4 liters per minute: 36 to 37% FIO2
      6. Flow 5 liters per minute: 40 to 41% FIO2
      7. Flow 6 liters per minute: 44 to 45% FIO2
    4. Flow rates >4 liters per minute irritate nasopharynx
    5. Does not provide humidified oxygen typically, but humidification can be added
    6. Requires patent nares
  3. References
    1. (1997) Pediatric Advanced Life Support, AHA, p. 4-5 to 4-7
    2. (2016) Fundamental Critical Care Support, SCCM, p. 45-60

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