FIGURE 5.

Relative changes in aerosols (150–300 nm) and droplets (0.5‐02.0 μm) during various oxygenation strategies. (A) The effects of procedural mask usage on 150–300 nm aerosol formation from a non‐rebreather mask (NRB) at 15 LPM. (B) The effects of procedural mask usage on 0.5–2.0 μm aerosol formation from a NRB at 15 LPM. (C) The effects of internal filtration of a continuous positive airway pressure (CPAP) device on subject‐derived 150–300 nm aerosol formation. (D) The effects of internal filtration of a CPAP device on subject‐derived 0.5–2 μm aerosol formation. Data shown are mean ± SEM. Asterisks indicate significant difference for mask usage at specific time points by a 2‐way repeated measures analysis of variance (*P < 0.05, **P < 0.01). For CPAP, no significant differences for filtration were noted, but the overall reduction in 150–300 nm particulates during the 10‐minute procedure was highly significant (P < 0.0001) compared to preprocedure for both arms of the experiment