The TREND II CPAP is a therapy device for the treatment of the obstructive sleep anpnea. The device provide a continuous positive pressure. In addition to the CPAP mode the respiration therapy device provides a FLEXLINE mode, an individual respiration flow proportionable pressure adjustment during the inspiration and the pressure drop during the expiration. This intelligent method of the pressure adaptation enables a smooth therapy. FLEXLINE-Mode In the FLEXLINE mode the pressure adjusts proportionally to the individual respiration flow. This means an increase in pressure on inspiration and a reduction in pressure on expiration. This results in a particularly gentle therapy.