Peak flow variation in childhood asthma: a three-year analysis
View abstract on PubMed
Summary
This summary is machine-generated.Peak expiratory flow (PEF) variation may not accurately reflect individual asthma control. However, mean diurnal variation (MDV) can be a useful indicator of asthma severity in group studies.
Area Of Science
- Pediatric Pulmonology
- Allergy and Immunology
- Respiratory Medicine
Background
- Peak expiratory flow (PEF) variation is proposed as an indicator for asthma severity and bronchial hyperreactivity.
- Assessing PEF variation's utility in tightly controlled allergic asthma requires further investigation.
Purpose Of The Study
- To examine the relationship between PEF variation, methacholine reactivity, symptom scores, and medication needs in children with allergic asthma.
- To determine if PEF variation is a reliable indicator of asthma severity and bronchial hyperreactivity.
Main Methods
- Studied 74 children with allergic asthma, measuring PEF variation (mean diurnal variation - MDV), methacholine reactivity, symptom scores, and medication requirements.
- Longitudinal analysis of 33 children over 36 months to track changes in MDV and other asthma variables.
Main Results
- Statistically significant correlations were found between MDV and methacholine reactivity (r=0.43) and symptom scores (r=0.28).
- Visit-to-visit changes in MDV did not consistently reflect changes in other asthma metrics.
- Group MDV decreased over time, particularly in those with higher initial MDV, coinciding with reduced medication needs and methacholine reactivity.
Conclusions
- Children with moderately severe, tightly controlled asthma may exhibit normal PEF variation.
- The correlation between PEF variation and asthma variables is too weak for individual patient treatment decisions.
- Mean diurnal variation (MDV) shows potential as a useful indicator of asthma severity in group research.