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Fig. 3 | Annals of Intensive Care

Fig. 3

From: Effects of high-flow nasal cannula and non-invasive ventilation on inspiratory effort in hypercapnic patients with chronic obstructive pulmonary disease: a preliminary study

Fig. 3

Individual data of a respiratory rate, b oxygen saturation (SpO2), and c transcutaneous CO2 pressure (PtcCO2) during non-invasive ventilation (NIV) and high-flow nasal cannula (HFNC) at different flow rates. *Indicates p < 0.05 compared with HFNC at a flow rate of 10 L/min, **Indicates p < 0.05 compared with HFNC at a flow rate of 20 L/min, γIndicates p < 0.05 compared with NIV

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