Fig. 1

Capnodynamic monitoring of changes in end-expiratory lung volume (∆\({\text{EELV}}_{{{\text{CO}}_{2} }}\)) and effective pulmonary blood flow (∆EPBF) in patients with (solid dots, black lines) or without (open squares, grey lines) an increase in P_aO₂/F_iO₂ by > 20 mm Hg following increased PEEP level (left hand graph). Changes in end-expiratory lung volume (∆\({\text{EELV}}_{{{\text{CO}}_{2} }}\)) and effective pulmonary blood flow (∆EPBF) are also shown in patients with (stars, black lines) or without (open circles, grey lines) an improvement in V_d/V_t following increased PEEP (right hand graph). Correlations are shown as Pearson’s regression (solid line) with the 95% confidence intervals (dashed lines)