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Figure 8 | Medical Gas Research

Figure 8

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

Figure 8

The normalized delivered helium concentration, [He] delivered /[He] supplied , is plotted against a composite parameter that includes the ratio between the supply gas flow rate and minute ventilation, Q s /V E , and the ratio between inspiratory and expiratory times, t i /t e , for a) the Hi-Ox mask, b) the Heliox21 mask, and c) the standard mask. Error bars represent standard deviations around mean values (n = 3). For each mask, the exponents in the composite parameter were determined through a least-squares fit of Equation (1) to the experimental data. Best-fit curves, and associated R2 values, are shown for each mask.

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