Fig. 2

Four representative cases showing overnight EFL_T variability and the counteracting EPAP dynamically responding to abolish EFL_T and bring ∆Xrs values < 2.8 EPAP adjustments (green lines) during the PSG are plotted against a moving average of ∆Xrs data (blue lines). The threshold ∆Xrs of 2.8 (red line) indicates the presence of EFL_T (EFL_T = ∆Xrs > 2.8 cmH₂O/L/s). ∆Xrs values < 2.8 indicates the absence of EFL_T