Figure 3From: Virtual respiratory system in investigation of CPAP influence on optimal breathing frequency in obstructive lungs diseaseLung volume versus intrapleural pressure. for Raw = norm, four values of CPAP, and the breathing frequency equal to 15/min (typical for healthy persons). Black points [Ppoint, Vpoint] determine the working points showed in Fig. 2 (where Pw = Ppoint-CPAP).Back to article page