Figure 7
The effects of gradual increase of PEEP, I:E ratio, and TV. (A) The effect of gradual increase of PEEP on classic IAP (open circles) and the respiratory-integrated MIAP (MIAPri; closed circles). Both the classic IAP and MIAPri were increased significantly (P < 0.001). The MIAPri was significantly higher than the classic IAP for all PEEP levels (P < 0.001). The dashed line shows the 12 mmHg IAH grade I threshold. (B) The effect of gradual increase of I:E ratio on IAPee (open circles) and MIAPri (closed circles). Both the IAPee and MIAPri were increased significantly (P < 0.001). The MIAPri was significantly higher than IAPee for all I:E ratios (P < 0.001). The dashed line represents the 12 mmHg IAH grade I threshold. (C) The effect of gradual increase of tidal volume (TV; and thus ΔIAP) on IAPee (open circles) and MIAPri (closed circles). The MIAPri was significantly higher than IAPee at all TV values (P < 0.001). The dashed line shows the 12 mmHg IAH grade I threshold.