๐ค It's the maximal rate of airflow during forced expiration
๐ค Dependent on patient-effort
๐ค Repeated 3 times and the best of the 3 is taken
๐ค Trends in Peak Expiratory Flow helps to assess the severity status of an acute episode, response to treatment etc
๐ค Normal values: Females: 250-500 L/min Males:450-700 L/min
๐ค METHODS TO MEASURE:
๐ Wright’s Peak flow meter : Commonly used clinically and is a constant pressure variable orifice device
๐ Pneumotachograph : Used for research purposes and is a variable pressure constant orifice device
๐ From flow volume loops : They are plots of airflow at various lung volumes. Help to distinguish between obstructive & restrictive devices
