Quantification of EFL as % of VT left to be expired at the moment of its onset as equivalently detected by the NEP technique and the specifically noted inflexion point on the Rrs–t graph at each level of applied EP in hPa


The numbered columns present the %VEFL findings of the eight experimental animals. (-) denotes the absence of EFL. EFL: expiratory flow limitation; EP: expiratory pressure; NEP: negative expiratory pressure; Rrs: respiratory resistance: t: time; VEFL: the fraction of the VT left to be expired at the onset of EFL; VT: tidal volume.