40
Participants
Start Date
December 31, 2013
Primary Completion Date
May 31, 2014
Study Completion Date
May 31, 2014
Carbocysteine
carbocisteine (2×250 mg, three times daily) for 6 weeks. The tablets are provided by Baiyunshan Pharmaceutical, China. patients will interviewed after 3 weeks to check their adherence to the study regimen by collecting and counting the number of remaining tablets, record adverse events, and refill study tablets for the next 3 weeks.
Continuous Positive Airway Pressure
Patients will interviewed after 3 weeks and the end of trial.We will check their compliance to device memory download , record adverse events and pressure .
Guangzhou institute of respiratory disease, Guangzhou
Guangzhou Institute of Respiratory Disease
OTHER