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Application of Kalman filter for breathing effort reconstruction for OSAS patients in breathing therapy

Abstract The CPAP (Continuous Positive Airway Pressure) therapy is the gold standard to treat the obstructive sleep apnoea syndrome (OSAS). The CPAP-device generates a positive pressure to splint the upper respiratory tracts preventing an collapse of the tracts and the pharynx. It has been shown that many CPAP-devices cannot maintain the pressure set points adjusted by the medical staff, because the mask pressure is seriously influenced by the patient’s breathing. In this work a method is provided to estimate the breathing effort of the patient. Therefore a model of the breathing therapy system is introduced and the application of the Kalman filter is described. The estimated breathing effort could then be used in further control strategies to improve the control quality.