Figures
- FIGURE 1
Differences between controlled (CB) and free breathing (FB) protocols, and associated factors. a) Functional residual capacity (FRC), showing no significant differences between the two protocols (mean difference (95% limits of agreement) −0.019 (−0.364–0.327) L, p=0.64) and no proportional bias (p=0.81), with b) between-protocol differences in FRC related to body mass index (BMI) (p=0.036). c) Lung clearance index (LCI), showing significant differences (0.235 (−0.578–1.048), p=0.020) but no proportional bias (p=0.179) between protocols. d) Conductive ventilation heterogeneity (Scond), showing no significant differences between protocols (−0.0020 (−0.034–0.030) L−1, p=0.59) and no proportional bias (p=0.203). e) Acinar ventilation heterogeneity (Sacin) was significantly different between protocols (0.0215 (−0.044–0.087) L−1, p=0.01) with a significant proportional bias (p=0.018), and f) between-protocol differences in Sacin were not predicted by between-protocol differences in tidal volume (VTFB−VTCB) (p=0.98) or respiratory rate (p=0.38, data not shown).
