The flutter valve is a hand-held mucus clearance device designed to combine positive expiratory pressure (PEP) with high frequency airway oscillations.
The Mini Wright Peak Flow Meter measures the maximum expiratory flow rate during a forced expiration.
Other causes of inspiratory and expiratory dyspnoea include airway stenosis following trauma, and parasites (eg Filaroides osleri) - rare.
Symptoms can be monitored with a peak flow meter (also called a peak expiratory flow meter).
In the early 2000s, some newer devices, such as the positive expiratory pressure (PEP) valve and the flutter device, have been added to the various chest physical therapy techniques.