COPD Clinical Trial
Official title:
Engineering Evaluation of the Vector NIV Device in Chronic Obstructive Pulmonary Disease (COPD) Patients
This study aimed to validate a novel automatic non-invasive ventilation (NIV) mode that continuously adjusts expiratory positive airway pressure (EPAP) to the lowest value that abolishes tidal expiratory flow limitation (EFL). The investigator conducted a prospective, non-randomized, study on stable chronic obstructive pulmonary disease (COPD) patients that may or may not be treated currently with NIV. Patients were studied in a sleep lab on a single night with the auto - titrating EPAP that adjusts to abolish tidal EFL. The primary endpoint was to evaluate the behavior of the EPAP during the night. Additionally, a sub-group of patients used the device at home for a 2 week period. EPAP behavior was assessed during this 2 week period.
Tidal Expiratory Flow Limitation (EFLT) is the inability to increase expiratory flow despite increasing effort. Especially in patients with mild to severe COPD, EFL can present challenges when receiving mechanical ventilation. To overcome EFLT expiratory positive airway pressure (EPAP) is applied; however, a single level or fixed EPAP may not overcome the airflow obstruction. The current study was undertaken to explore the variability of EFLT determined using Forced Oscillation Technique (FOT) to dynamically measure lung reactance (∆Xrs) and to evaluate the ability of automatically adjusted EPAP (PEEPopt) to over come EFLT overnight and over a two week period. In this prospective non-randomized trial, an unreleased noninvasive ventilator set in an S/T mode applied continuous oscillations (5 Hz, 1 cmH2O amplitude, 2 cmH20 peak to peak). Response to the oscillations was analyzed to calculate ∆Xrs and EPAP was adjusted automatically between 4 and 20 cmH2O. A fixed pressure support of 6 cmH2O was delivered. ∆Xrs was measured sitting and supine. Participants with evidence of EFLT (∆Xrs > 2.8) were asked to undergo overnight polysomnography (PSG) and then a sub-group of patients used the ventilator at home for two weeks. EFLT within and between participants was analyzed. EFLT behavior during PSG, the response of the device to dynamically abolish EFLT, as well as the impact of this therapy on sleep quality was studied. Objective ventilator adherence data were used to determine usage after the 2-week in-home use. Additionally, experienced NIV participants qualitatively rated therapy comfort compared to their current treatment. ;
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