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A peak-flow meter is a portable, hand-held device that measures airflow and comes in various shapes and sizes. The peak (expiratory) flow is a measurement of how fast a child can blow air out after taking in a full deep breath. It is dependent on good effort so a lot of encouragement during the maneuver may be necessary.
A peak-flow meter can help assess:
1) How well one's medication is working and whether or not to consider changing the dosage
2) How severe an existing episode is and whether or not emergency care is needed
3) How unstable asthma control is. A significant fluctuation in values from a.m. to p.m. is a sign of poor asthma control.
4) If an asthma episode is on the horizon. There may be a decline in peak flow measurements prior to the development of asthma symptoms by hours or even days. If so, an action plan can go into effect that much sooner.
How to use a peak-flow meter:
It is best to follow the instructions that come with your meter, but in general:
1) Move the sliding indicator to zero
2) While in a standing position, take in a full, deep breath to inflate your lungs
3) Put the mouthpiece of the peak-flow meter into your mouth, close your lips, and make a tight seal around it
4) Blow out as hard and as fast as possible
5) Record the result (the number opposite the indicator)
6) Reset the indicator, and repeat 2-3 times
7) Record the best value that was achieved
Finding your personal best peak-flow number:
Record twice-daily results for two weeks. The highest reliable number that is consistently achieved determines your child's personal best peak-flow number.
Peak-flow method of monitoring asthma:
Peak-flow monitoring is an additional tool that your physician may teach you to utilize to monitor your child's asthma control.
GREEN (SAFE ZONE): When asthma is well-controlled, the peak flow should measure 80-100% of the personal best. Your child is safe, well-maintained and possibly a candidate for medication reduction.
YELLOW (CAUTION ZONE): When the peak flow measurement is 50-80% of the personal best, more aggressive, stepped-up management is needed as outlined in your action or rescue plan.
RED (DANGER OR ALERT ZONE): When the peak flow measurement falls below 50% of the personal best, a moderate to severe episode is occurring. Aggressive management, along with quick-relief, rescue medications must be started promptly. If the peak flow numbers do not return to-and stay in-the yellow or green zone with treatment, you must notify your doctor or go to the emergency room.
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