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Abnormalities of functional residual capacity in symptomatic and asymptomatic young asthmatics
J B Pool1, A Greenough, J F Price
1Department of Child Health, King's College Hospital, London, England.
Insights
In young asthmatics, elevated functional residual capacity (FRC) indicates hyperinflation. Reduced FRC after treatment suggests improved asthma control, potentially predicting inadequate therapy.
Area of Science:
- Pediatric Pulmonology
- Respiratory Physiology
- Asthma Research
Background:
- Pediatric asthma often involves dynamic hyperinflation.
- Measuring lung volumes like functional residual capacity (FRC) is crucial for assessing airflow obstruction.
Purpose of the Study:
- To investigate functional residual capacity (FRC) in young asthmatics.
- To determine if FRC can predict asthma treatment adequacy.
Main Methods:
- Helium gas dilution technique used to measure FRC.
- Study included 186 asthmatic children aged 2-9 years.
- Comparison between symptomatic, asymptomatic, and hospitalized children.
Main Results:
- Majority of young asthmatics showed hyperinflation (increased FRC).
- Symptomatic and hospitalized children had significantly higher FRC (p<0.01).
- Eight symptomatic children became asymptomatic post-treatment, showing reduced FRC.
Conclusions:
- Elevated FRC in young asthmatics suggests hyperinflation.
- FRC reduction correlates with symptom improvement after treatment.
- FRC exceeding one standard deviation above the mean may predict inadequate asthma treatment.
Abstract:
Functional residual capacity (FRC) was measured by helium gas dilution in 186 young asthmatics, aged between 2 and 9 years. The majority were hyperinflated, as evidenced by an increase in FRC, regardless of symptom status. Symptomatic children and those hospitalized with an acute asthma attack had significantly elevated FRC when compared to asymptomatic children (p less than 0.01). Eight symptomatic children, following treatment modification, became asymptomatic. This was associated with a reduction in FRC. We suggest that an FRC result greater than one standard deviation from the mean of asymptomatic asthmatics could be used to predict inadequacy of treatment.