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Respiratory measurement devices

Measuring exhalation strength is important to identify and treat obstructive (narrowed) airway disease. Airway narrowing makes breathing difficult to the point of breathlessness. Obstructive airway diseases include COPD (chronic obstructive pulmonary disease), emphysema, chronic bronchitis, bronchiectasis (bulging of the bronchial tubes) 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 given in liters per minute.

Regular peak flow measurements can detect even small changes in lung condition. This makes it easier to assess the effect of the medication.