METHOD AND SYSTEM FOR THE DETECTION OF THE RESPIRATORY PROFILE OF A PATIENT UNDERGOING NON INVASIVE RESPIRATORY ASSISTANCE BY NASAL CANNULAS OR OTHER INTERFACE

System and method for monitoring respiratory quantities during the administration of oxygen at various concentrations by nasal cannulas, in particular by means of an HFNC (High Flow Nasal Cannula) apparatus (100) or a CPAP (Continuous Positive Airway Pressure) apparatus (200), which system and method provide the use of: - a first flow detector (21 or 1021, DPT-A) configured to measure a delivered flow (ΦHFNC_PNT-A or ΦΟΡΑΡ_ΙΠ_ΡΝΤ-Α) of oxygen at different concentrations administered upstream the nasal cannulas (105 or 205); - a second flow detector (22 or 1022, DPT-B) configured to measure a residual flow (ΦMask_PNT-B or ΦΟΡΑΡ_out_ΡΝΤ-Β) that crosses an oro-nasal mask (3) worn above the nasal cannulas (105) of an HFNC apparatus (100) or expiratory branch (206) of the ventilation circuit in the case of a CPAP apparatus (200); - a pharyngeal catheter (4) associated with a pressure transducer (DPT-D) for measuring pharyngeal pressure (Pphar); - an esophagus-gastric catheter (5) associated with two pressure transducers (DPT-E, DPT-F) for measuring the esophageal pressure (PEs) and gastric pressure (PGa); - a catheter associated with a pressure transducer (DPT-C) configured to measure the internal pressure of the oro-nasal mask (3) (PMask) or a circuit catheter (1006) associated with a pressure transducer (DPT-C ) configured to measure the pressure inside the ventilation circuit near the nasal cannulas (205) (PCirc); - an oscilloscope (7); - a processing unit (10 or 1010) for the determination of parameters representative of respiration and/or pulmonary mechanics. L'invention concerne un système et un procédé de surveillance des quantités respiratoires lors de l'administration d'oxygène à diverses concentrations au moyen de canules nasales, en particulier au moyen d'un appareil à canules nasales à haut débit HFNC (100) ou d'un appareil à pression positive continue des voies aériennes (CPAC) (200), ce système et ce procédé utilisant : un premier détecteur d'écoulement (21 ou 1021, DPT-A) conçu pour mesurer un flux délivré (ΦHFNC_PNT-A ou ΦΟΡΑΡ_ΙΠ_ΡΝΤ-Α) d'oxygène à différentes concentrations administré en amont des canules nasales (105 ou 205); un second détecteur de flux (22 ou 1022, DPT-B) conçu pour mesurer un flux résiduel (ΦMask_PNT-B ou ΦΟΡΑΡ_out_ΡΝΤ-Β) qui traverse un masque bucco-nasal (3) porté au-dessus des canules nasales (105) d'un appareil HFNC (100) ou d'une branche expiratoire (206) du circuit de ventilation dans le cas d'un appareil CPAP (200); u