Hi CM2339, and thanks for your post and question - it's a good one! Many of the patients I have treated have been prescribed and used the various Positive Expiratory Pressure (PEP) devices which are on the market today. For many of the patients, the device works extremely well. For others, not so much. It really can vary from patient to patient. Your Dad may be a good candidate for this device based on the symptoms you've shared with us.
I see our community member, , has already shared his own experience using this device with you. Clearly, he is just the sort of patient that finds this therapy to be extremely effective. (Thanks, Dminor!)
We also have an excellent article, authored by John Bottrell, published right here on COPD.net, which explains this type of therapy thoroughly. For your convenience, here is a link to that article: https://copd.net/clinical/flutter-valves-acapellas. If you think this might be of benefit for your Dad, you may want to speak with his doctor.
Please do check back and let us know how this works out for him (and you!)
What do you think?
Leon (site moderator COPD.net)