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Training perception of air flow obstruction in asthmatics
B A Silverman1, D Mayer, R Sabinsky
1Department of Allergy and Immunology, Long Island College Hospital, Brooklyn, NY.
Annals of Allergy
|November 1, 1987
Summary
Asthma patients accurately estimated their peak expiratory flow rate (PEFR) after training. This self-monitoring skill remained consistent, showing its validity for managing asthma control.
Area of Science:
- Pulmonary Medicine
- Respiratory Physiology
- Asthma Management
Background:
- Accurate self-monitoring of asthma control is crucial for effective management.
- Peak expiratory flow rate (PEFR) is a key objective measure of airflow obstruction.
- Understanding the correlation between subjective breathing perception and objective PEFR measurements is important.
Purpose of the Study:
- To assess the accuracy of self-estimated peak expiratory flow rate (PEFR) in asthma patients.
- To evaluate the relationship between subjective breathing scores and measured PEFR.
- To determine the validity of PEFR self-estimation during varying levels of airflow obstruction.
Main Methods:
- Eighteen asthmatics (aged 7-43) were trained in PEFR measurement.
- Subjects estimated and measured PEFR under supervision and at home.
- Correlation coefficients (r1, r2) were calculated between estimated and measured PEFR, and breathing scores and PEFR.
Main Results:
- High correlation (r1 ≥ .97) between estimated and measured PEFR was observed, persisting over time and during abnormal airflow.
- A small tendency for under- or overestimation of PEFR was noted in some subjects.
- Correlation (r2) between breathing scores and measured PEFR was significant but moderate (group mean .37-.45), and not significant for abnormal PEFR.
Conclusions:
- Trained asthma patients can accurately estimate their PEFR, demonstrating a valid self-monitoring tool.
- Subjective breathing scores have a limited correlation with objective PEFR measurements, especially during exacerbations.
- PEFR self-estimation is a reliable method for asthma self-management.
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