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Fig. 1 | Annals of Intensive Care

Fig. 1

From: Lung volumes and lung volume recruitment in ARDS: a comparison between supine and prone position

Fig. 1

Lung volumes, measurements and calculations made in the study. The same procedures were carried out in supine and prone positions as follows: (1) measurement of end-expiratory lung volume (EELV): EELV is defined as the resting end-expiratory lung volume at PEEP. (2) Removal of PEEP and continuation of mechanical ventilation at zero end-expiratory pressure (ZEEP). (3) Measurement of functional residual capacity (FRC): FRC is defined as the resting lung volume at ZEEP. (4) Measurement of the tidal volume, delivered from ZEEP, that generated a Pplat equal to the basal PEEP. The same calculations were carried out in supine and prone positions as follows: (a) calculation of PEEP-induced increase in lung volume = EELV minus FRC. (b) Calculation of PEEP-induced lung volume recruitment (Vrec) = PEEP-induced increase in lung volume minus the Vt, delivered from ZEEP, that generated a Pplat equal to the basal PEEP. Blue line represents the compliance at ZEEP

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