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Fig. 4 | Respiratory Research

Fig. 4

From: Effect of nocturnal EPAP titration to abolish tidal expiratory flow limitation in COPD patients with chronic hypercapnia: a randomized, cross-over pilot study

Fig. 4

Gas exchange during the night with EFLT-abolishing-EPAP vs. fixed-EPAP. Data are reported as individual values (open symbols dotted lines) and as mean ± SD of all subjects (closed symbols). SpO2: peripheral oxygen saturation. T90: percentage of time spent with oxygen saturation SpO2 below 90%. PtcCO2: transcutaneous partial pressure of carbon dioxide. T hypercapnia: percentage of time spent with a PtcCO2 > 45 mm Hg. T hypercapnia and ΔXrs data for 11 subjects. *p < 0.05 between nights

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