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Pressure-volume (P-V) relationship in patients with normal intra-abdominal pressure (IAP; left panel) and intra-abdominal hypertension (IAH; right panel) as a function of PEEP. The progressive shift to the left (i.e. at the same pressure the volume is higher at higher positive end-expiratory pressure (PEEP)) with increasing PEEP suggest recruitment. Data are presented as mean ± standard deviation.
