Figure 4From: Bench-to-bedside review: Distal airways in acute respiratory distress syndromeExpiratory flow and detecting intrinsic positive end expiratory pressure. Intrinsic positive end-expiratory pressure (PEEP) is present if the expiratory flow does not reach zero before initiation of the next breath. PEEP can be suspected by the appearance of a truncated expiratory loop. Reproduced with permission from Dhand [73].Back to article page