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FIO 2

FIO 2

These two graphs explain the percentage of nasal cannula oxygen in the inspired volume, and the minimal effect that O2 purity has on FIO2. Also this is provided with the scientific source that has produced the statistics.

Nasal cannula oxygen represents only 3-7% of inspired volume

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RR 20-30/min, 2-3 LPM, I:E 1:2

O2 purity has little influence on FIO2

OXYGEN SOURCE ROOM AIR LIQUID OXYGEN (2LPM)
FIO 2
O2 purity 21% 99,6%
nasal cannula FIO2 equation 21% x 500ml = 105ml 99,6% x 33ml = 33ml
21% x (500-33)ml = 98ml
131ml
Calculated FIO 105/500 = 21% 131/500 = 26.2%

Nasal cannula FIO2 equation. Clinical Application of Blood Gases. Shapiro BA. 5th ed RR/20min, I:E, inspiration 2s, 2 LPM = 33ml/s105/500 = 21%