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Figure 7 | Medical Gas Research

Figure 7

From: Methods for evaluation of helium/oxygen delivery through non-rebreather facemasks

Figure 7

The normalized delivered helium concentration, [He] delivered /[He] supplied , is plotted against the ratio between the supply gas flow rate and minute ventilation, Q s /V E , for each of the three masks tested, supplied with 78/22 or 65/35 %vol helium/oxygen (He/O 2 ). For comparison, trend lines are also shown for each mask. Error bars represent standard deviations around mean values (n = 3).

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