Related Experiment Videos
Bronchodilator responsiveness in infants with bronchiolitis
R S Tepper1, D Rosenberg, H Eigen
1Indiana University School of Medicine, Department of Pediatrics, Indianapolis.
Pediatric Pulmonology
|February 1, 1994
Summary
Inhaled metaproterenol improved airway function in some infants with bronchiolitis, particularly younger ones and females. However, the specific subgroup benefiting from this bronchodilator remains unclear due to age and gender influences.
Area of Science:
- Pediatrics
- Respiratory Medicine
- Pharmacology
Background:
- Bronchiolitis is a common viral respiratory infection in infants.
- Airway obstruction is a key feature of bronchiolitis.
- Bronchodilator use in bronchiolitis is controversial.
Purpose of the Study:
- To evaluate the effect of inhaled metaproterenol on airway function in infants with bronchiolitis.
- To identify factors influencing bronchodilator responsiveness in this population.
Main Methods:
- 34 infants with bronchiolitis underwent spirometry to measure forced expiratory flows (VmaxFRC) at functional residual capacity.
- Measurements were taken at baseline, after normal saline (NS) inhalation, and after metaproterenol inhalation.
- Flows were analyzed as Z-scores, comparing them to predicted values.
Main Results:
- Younger infants (< 2 months) and females showed improved airway function after metaproterenol.
- Outpatients, older infants (> 2 months), and males had more significant airway obstruction at baseline.
- Normal saline slightly decreased airflow; metaproterenol improved airflow in younger infants and females, but not older infants or males.
Conclusions:
- Inhaled metaproterenol can improve airway function in a subset of infants with bronchiolitis.
- Age and gender appear to be significant factors influencing response to metaproterenol.
- Further research is needed to clearly define the subgroup that benefits from bronchodilators in bronchiolitis.