Fig. 1From: Effect of external PEEP in patients under controlled mechanical ventilation with an auto-PEEP of 5 cmH2O or higherFrequency distribution of differences in total PEEP (ΔPEEPtot) in PEEP versus ZEEP phases. On the upper side the differences are shown as the absolute value in cmH2O; on the lower side the differences are expressed as a percentage of applied PEEP. PEEP positive end-expiratory pressure, PEEP tot total PEEP, ZEEP zero end-expiratory pressureBack to article page