“…However, SF 6 is a more viscous gas with a higher molar mass, and it is unknown if this affects tidal breathing in infants. To better understand the effect of 4% SF 6 on infant tidal breathing patterns, Andrade et al 6 performed tidal breathing measurements in a cohort of 12 infants before and after SF 6 MBW. They found that multiple tidal breathing measurements (respiratory rate [RR], ratio of time to peak expiratory flow over total expiratory time, and mean tidal expiratory flow) were significantly different pre‐ and post‐MBW.…”