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Fig. 3 | Trials

Fig. 3

From: Positive end-expiratory pressure (PEEP) level to prevent expiratory flow limitation during cardiac surgery: study protocol for a randomized clinical trial (EFLcore study)

Fig. 3

The PEEP test. Flow-volume loops of patients undergoing positive end-expiratory pressure (PEEP) test. a Subtraction of 3 cmH2O of PEEP in this cohort of patients leads to an increase of expiratory flow: these patients are classified as not flow-limited. b Subtraction of 3 cmH2O of PEEP does not increase expiratory flow, except for a brief, initial, transient increase, which is mainly the result of a sudden reduction of volume of the upper airways and denotes flow limitation. See text for further explanations

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