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Each litre is equivelant to approximately 3%. 35% Oxygen is about 5 litres
This math here is only correct if you are using a nasal cannula to deliver the oxygen. Respiratory therapy only uses this as an estimate since the cannula isn't the most effective oxygen delivery system but is the most comfortable for a patient.
21% Fio2 is room Air, that is we breath in normally, for anyone without any supplemental Oxygen.
The first 1 liter is 3%Fio2, which is 21% +3% =24%Fio2, thereafter it is 4% to each liter flow of oxygen
First liter of Oxygen which is 1Lpm =3% + 21%(Room Air) Total = 24% Fio2 Add 4% for each liter flow there 2Lpm= 28% Fio2
3Lpm= 32% Fio2
Save
4Lpm= 36% Fio2
5Lpm= 40% Fio2
6Lpm= 44% Fio2
For a Venturi Mask which is more effective especially for patients with COPD the Fio2 settings are as follows:
White cap:
- 35% FiO2 set lpm at 9
- 40% FiO2 set lpm at 12
- 50% FiO2 set lpm at 15
Green cap:
- 24% FiO2 set lpm at 3lpm
- 26% FiO2 set lpm at 3lpm
- 28% FiO2 set lpm at 6lpm
- 30% FiO2 set lpm at 6 lpm
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∙ 11y ago
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