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Changes in end-expiratory lung volume (EELV) during the bilevel period and CPAP periods. A: by the end of the bilevel period, EELV has fallen ∼410 ml from baseline. B: during the CPAP period, after a 1–2 breath further decline of ∼30 ml, EELV changes very little on a breath by breath basis, even as flow initially increases then decreases.
