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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)