Schematic representation of the pressure-time diagram at the end of each epoch in a single patient. Data at both PEEP levels studied are presented. Patm, atmospheric pressure; EELV, end-expiratory lung volume measured by using the nitrogen technique; PEEP-volume, volume trapped by PEEP above the functional residual capacity, measured by using a long exhalation to atmospheric pressure (zero end-expiratory pressure); Vt, tidal volume; ΔEELV, EELVhigh PEEP - EELVlow PEEP ; ΔPEEP-volume, PEEP-volumehigh PEEP - PEEP-volumelow PEEP.
Dellamonica et al. Critical Care 2011 15:R294 doi:10.1186/cc10587