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The performance of Mini Wright peak flow meters after prolonged use
Respiratory Medicine
|October 1, 1995
Summary
Mini Wright peak flow meters can remain accurate for up to 14 years. However, some new meters showed significant changes after one year, emphasizing the need for regular device checks by clinicians.
Area of Science:
- Respiratory Medicine
- Medical Device Technology
- Pulmonary Function Testing
Background:
- Peak expiratory flow (PEF) meters are crucial for monitoring respiratory conditions.
- Mini Wright meters are widely used, but their long-term accuracy requires evaluation.
Purpose of the Study:
- To assess the accuracy of new and aged Mini Wright peak flow meters.
- To determine the impact of usage and age on device performance.
Main Methods:
- Tested 84 new and 35 old Mini Wright peak flow meters using a servo-controlled pump.
- Evaluated meter accuracy against established confidence limits.
- Retested new meters after one year of use and old meters after washing.
Main Results:
- New meters demonstrated 95% confidence limits of +/- 151 min-1 to +/- 28 l min-1.
- 63% of old meters (1-13 yr) were within the new meter confidence limits.
- Some new meters showed significant reading changes after one year; washing did not correct changes in old meters.
Conclusions:
- Mini Wright meters can maintain accuracy up to 14 years.
- Significant changes in meter readings can occur after just one year of use.
- Clinicians should regularly check patient peak expiratory flow meters at clinic visits.