patients from the Pulmonology Service of the Corporació Sanitària Parc Taulí (Sabadell, Barcelona) who met the following criteria: over 18 years of age, hospital admission for acute chronic respiratory failure, home NIV (single-limb system with intentional leakage) users for more than 6 months with adequate compliance (greater than or equal to 5 hours/night). Patients with underlying psychiatric disease were excluded. The study was conducted during the patient's predischarge phase (the same day or the day before)

The procedure was performed in the patient's room during his or her hospital stay to avoid additional visits for study participation. The patient was placed in the supine position, and the usual ventilator interface was placed in a single-limb system, along with the commercial ventilator to be studied. The ventilator model were evaluated at bedside in random order. The parameters of the ventilator were the same as those that the patients used at home (that is, unlike the bench study, the sensitivity of the trigger was not modified). A external polygraph was used to moritor the study, with the incorporation of thoracic and abdominal bands and parasternal electromyography, to better evaluate asynchronies, in addition to pulse oximetry control. The ventilation periods were 1 minute (without gas, gas, without gas). This sequence was performed twice in each group of established conditions.

Presence of asynchronies identify by SOMNONIV´s algorithm during the gas treatment with NIV

autotrigger or innefective effort identify by SOMNONIV´s group algorithm, during the gas treatment with NIV

autotrigger or innefectuve effort identify by SOMNONIV´s group pre gas during NIV treatment

autotrigger or innefective effort identify by SOMNONIV´s group algorithm, , post gas during NIV