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Persistent lung hyperinflation in apparently asymptomatic asthmatic children
J B Pool1, A Greenough, J G Gleeson
1Department of Child Health, King's College Hospital, Denmark Hill, London, U.K.
Insights
Young asthmatic children often remain hyperinflated despite reporting no symptoms. This study highlights discrepancies between objective lung function tests and subjective symptom reporting in pediatric asthma.
Area of Science:
- Pediatric Pulmonology
- Respiratory Medicine
- Asthma Research
Background:
- Pediatric asthma management often relies on subjective symptom reporting.
- Objective measures of lung function are crucial for a comprehensive assessment.
Purpose of the Study:
- To investigate serial changes in functional residual capacity (FRC) in young asthmatic children.
- To compare objective lung function measurements with subjective symptom reporting over three months.
Main Methods:
- Serial measurements of functional residual capacity (FRC) using helium gas dilution.
- Recruitment of pediatric asthma patients during hospitalization and outpatient visits.
- Follow-up over a three-month period.
Main Results:
- Children with asthma exhibited FRC values exceeding 120% of predicted values.
- The majority of children remained hyperinflated throughout the follow-up period.
- Persistent hyperinflation was observed despite the absence of reported asthma symptoms.
Conclusions:
- A significant divergence exists between objective respiratory function (hyperinflation) and subjective symptom reporting in young asthmatic children.
- The clinical significance of persistent hyperinflation in pediatric asthma requires further urgent investigation.
- Objective lung function monitoring is essential in pediatric asthma management.
Abstract:
Serial measurements of functional residual capacity (FRC) by helium gas dilution were made in young asthmatic children over a 3 month period. Eight children were recruited during hospitalization for an acute asthma attack and eleven during routine outpatient attendances. Both groups of children had FRC's greater than 120% of that predicted for height at recruitment. Although the children denied symptoms throughout the three month follow-up period the majority remained hyperinflated. These results demonstrate a striking difference between objective and subjective assessment of respiratory function in young children. The significance of this persistent abnormality and its relationship to other lung function indices needs urgent investigation.