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Respiratory measurement devices
Measuring exhalation punching is important to identify and treat obstructive (narrowed) airway disease. The narrowing of the airway makes it difficult to breathe, even to the point of breathlessness. Obstructive respiratory diseases include COPD (chronic obstructive pulmonary disease), emphysema, chronic bronchitis, bronchiectasis (bronchial tube outpouching), and asthma.
One measure of airway width is the maximum rate (peak flow) at which a person can exhale air. The result of a peak flow measurement is expressed in litres per minute.
Regular peak flow measurements can detect even small changes in the condition of the lungs. This makes it easier to assess the effect of medication.