A peak flow meter is a small, hand-held device used to manage asthma by monitoring airflow through the bronchi and thus the degree of restriction in the airways. The peak flow meter measures the patient's maximum ability to expel air from the lungs, or peak expiratory flow rate (PEFR or PEF). Peak flow readings are higher when patients are well, and lower when the airways are constricted. From changes in recorded values, patients and doctors may determine lung functionality, severity of asthma symptoms, and treatment options.
The measurement of peak expiratory flow was pioneered by Dr. B.M. Wright, who produced the first meter specifically designed to measure this index of lung function. Since the original design of instrument was introduced in the late 1950's, and the subsequent development of a more portable, lower cost version (the 'Mini-Wright' peak flow meter), other designs and copies have become available across the World.
Scales
Usage
- Make sure the device reads zero or is at base level.
- Stand up if possible.
- Take as deep a breath as possible.
- Place the meter in your mouth. Close your lips around the mouthpiece.
- Blow out as hard and as fast as possible (one to two seconds).
- Do not cough, spit or let your tongue block the mouthpiece.
- Repeat the process two additional times.
- Record the highest of the three numbers in your chart, as well as any additional symptoms.
You may record your peak flow before and after using your rescue inhaler. If your medicine is working you should see an improvement in your peak flow reading.
See also
