Fig. 2

Air distribution in lung parenchyma, percentage of lung recruitment and strain in the non-dependent, dependent, and whole lung. A Air distribution in lung parenchyma in in the non-dependent, dependent, and whole lung. Black, non-aerated lung volume (− 100 to + 100 hounsfield units); dark grey, poorly inflated lung volume (− 500 to − 100 hounsfield units); light grey, normally inflated lung volume (− 501 to − 900 hounsfield units); white, overinflated lung volume (< − 900 hounsfield units), ZEEP, air distribution at zero end-expiratory pressure; PEEP, air distribution at end-expiratory hold, INSP, air distribution at end-inspiratory hold. B Percentage of recruitment associated to the application of apneic and ultraprotective ventilation in the non-dependent, dependent and whole lung. PEEP, recruitment due to positive end-expiratory pressure from zero positive end-expiratory pressure (ZEEP); tidal volume; recruitment due to tidal volume from end-expiratory pressure. C Static and dynamic strain in the non-dependent, dependent and whole lung. Static, static strain due to the application of PEEP; dynamic, dynamic strain due to the application of tidal volume. Brackets denote statistically significant differences, p values are shown above the brackets. a: p < 0.05 PEEP vs. ZEEP. b p < 0.05 INSP vs. PEEP