Fig. 1
From: Effects of surgical masks on droplet dispersion under various oxygen delivery modalities
Representative accumulated photographs of droplet (> 5 µm) dispersion. Representative accumulated photographs at rest breathing, speaking, and coughing in room air, 5 L/min of nasal cannula, and 60 L/min of HFNC, and with or without surgical masks are shown. Droplet dispersion was not visually increased by oxygen delivery modalities compared to room air, regardless of breathing patterns. With surgical masks over the nasal canula or HFNC, droplet dispersion was barely visible. HFNC high-flow nasal cannula;