Table 1 Average inhaled helium concentrations measured on the bench and in healthy adult subjects[17]
From: Methods for evaluation of helium/oxygen delivery through non-rebreather facemasks
Average inhaled He concentration | ||||
|---|---|---|---|---|
Mask | Supply flow [l/min] | Laerdal [±2%] | Simulaids [±2%] | Clinical data [mean (range)%] |
Hi-Ox | 15 | 52.2 | 54.3 | 60.1 (52.3 - 67.8) |
12 | 49.4 | 52.4 | 53.5 (42.5 - 66.0) | |
10 | 47.1 | 46.2 | 45.0 (30.5 - 59.9) | |
7 | 43.1 | 37.4 | 41.5 (26.3 - 52.8) | |
Heliox21 | 15 | 37.9 | 32.9 | 54.9 (35.4 - 69.9) |
12 | 34.1 | 28.9 | 46.1 (30.7 - 57.7) | |
10 | 31.7 | 25.3 | 38.3 (31.1 - 47.0) | |
7 | 27.2 | 20.6 | 28.2 (18.8 - 35.3) | |
Standard | 15 | 36.5 | 42.1 | 50.9 (41.4 - 63.1) |
12 | 32.7 | 36.3 | 42.2 (30.5 - 54.6) | |
10 | 29.6 | 31.6 | 36.7 (26.3 - 43.3) | |
7 | 24.9 | 26.1 | 26.7 (20.9 - 32.3) | |