Symptomatic Treatment of Excessive Dynamic Airway Collapse Using Daytime Portable Continuous Positive Airway Pressure

Participants will be established on portable CPAP during the day with nasal pillows as an interface and requested to use it at least 8 hours/day.

Participants will undergo a run-in phase during which they will undergo baseline assessments. If they tolerate the portable CPAP and if their 6-MWT improves by more than 30m when performed on CPAP, they will be randomised into the trial.

No change will be made to participants care