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In page Acute respiratory distress syndrome:

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The 'best PEEP' used to be defined as 'some' cmH2O above the lower inflection point (LIP) in the sigmoidal pressure-volume relationship curve of the lung. Recent research has shown that the LIP-point pressure is no better than any pressure above it, as recruitment of collapsed alveoli—and, more importantly, the overdistension of aerated units—occur throughout the whole inflation. Despite the awkwardness of most procedures used to trace the pressure-volume curve, it is still used by some to define the minimum PEEP to be applied to their patients. Some new ventilators can automatically plot a pressure-volume curve.[citation needed]