Fig. 5. Correlation between the maximal decrease in mean blood pressure (BP ) of the dogs recorded during the recruitment maneuver or the first 2-min period of the positive end-expiratory pressure titration and the change in end-expiratory lung volume (EELV ) (above ) and aerated EELV (EELV–atelectatic volume) (below ) induced by the recruitment maneuver (closed circles ) or the pressure titration (open circles ).