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Classifying asthma severity in children: mismatch between symptoms, medication use, and lung function
Leonard B Bacharier1, Robert C Strunk, David Mauger
1Division of Allergy and Pulmonary Medicine, Department of Pediatrics, Washington University School of Medicine, St. Louis Children's Hospital, One Children's Place, St. Louis, MO 63110, USA. bacharier_L@kids.wustl.edu
Summary
Asthma severity in children, based on symptoms and medication, does not align with lung function (FEV1) measures. However, FEV1/FVC ratios decrease as asthma severity increases, indicating airflow obstruction.
Area of Science:
- Pediatric Pulmonology
- Respiratory Medicine
- Clinical Asthma Research
Background:
- Current asthma management guidelines classify severity using symptom frequency, medication use, and lung function.
- The National Asthma Education and Prevention Program/Expert Panel Report 2 Guidelines provide a framework for asthma severity classification.
- Assessing the concordance between clinical assessment and objective lung function measures is crucial for accurate asthma management.
Purpose of the Study:
- To evaluate the consistency between asthma severity levels defined by symptom and medication frequency and lung function measures in children.
- To determine if spirometry results align with the clinical classification of asthma severity in pediatric patients.
Main Methods:
- Parents of children (5-18 years) with asthma completed questionnaires on symptom frequency and medication use.
- Children underwent spirometry to assess lung function.
- Asthma severity was categorized based on symptom and medication data according to established guidelines.
Main Results:
- FEV1 % predicted did not significantly differ across asthma severity levels.
- FEV1/FVC ratio decreased significantly as asthma severity increased (p < 0.0001).
- Abnormal FEV1/FVC ratios were more prevalent in children with increased asthma severity.
Conclusions:
- Asthma severity classification based on symptom and medication frequency in children does not correlate with FEV1 measures.
- FEV1 remains normal in many children, even with severe persistent asthma.
- FEV1/FVC ratio serves as a more sensitive indicator of airflow limitation that worsens with increasing asthma severity in pediatric populations.