Reduced Effective Oxygen Delivery and Ventilation with a Surgical Facemask Placed under Compared to over an Oxygen Mask: A Comparative Study

<div>Box and Whisker plots of sampled FeO<sub>2</sub> at the lips with a surgical facemask only, an O<sub>2</sub> mask only, a surgical facemask over an O<sub>2</sub> mask, and a surgical facemask under an O<sub>2</sub> mask. The circles, squares, and triangles represent average values for each of the five subjects in the various mask configurations.</div>

Anesthesiology Research and Practice

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Figure 2

Figure 2: Reduced Effective Oxygen Delivery and Ventilation with a Surgical Facemask Placed under Compared to over an Oxygen Mask: A Comparative Study 

Figure 2 | Reduced Effective Oxygen Delivery and Ventilation with a Surgical Facemask Placed under Compared to over an Oxygen Mask: A Comparative Study 