300
Participants
Start Date
August 1, 2025
Primary Completion Date
July 31, 2026
Study Completion Date
September 30, 2026
Speaking valve combined with airway pressure
All patients wore speaking valves for 30 minutes, during which the transtracheal end-expiratory pressure was measured to assess the patency of the upper airway.
Bronchoscopy
The same examiner performed bronchoscopy on all patients to assess upper airway patency.
Capital Medical University
OTHER