Fig. 1From: Effectiveness of nasal highflow in hypercapnic COPD patients is flow and leakage dependentExperimental conditions. A = 20 L/min, low leakage, two prongs, both inside; B = 40 L/min, low leakage, two prongs, both inside; C = 40 L/min, high leakage, two prongs, one outside and open; D = 40 L/min; high leakage, two prongs, one outside and closedBack to article page