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Lack of a late asthmatic response after hypertonic saline challenge in children
W Eder1, M Schreuer, J Riedler
1Paediatric Pulmonology, Children's Hospital Salzburg, Austria.
Insights
A hypertonic saline challenge in children with bronchial hyperresponsiveness did not reveal a late asthmatic response. Lung function remained stable 4-12 hours post-challenge, suggesting this response is unlikely in this population.
Area of Science:
- Pediatric Pulmonology
- Respiratory Medicine
- Allergy and Immunology
Background:
- Hypertonic saline challenge is a standard method for assessing airway responsiveness.
- Uncertainty exists regarding the occurrence of late asthmatic responses following such challenges.
Purpose of the Study:
- To investigate the potential for a late asthmatic response after a hypertonic saline challenge in children.
- To evaluate lung function changes in children with mild to moderate bronchial hyperresponsiveness.
Main Methods:
- Twenty-one children with bronchial hyperresponsiveness underwent hourly forced expiratory volume in one second (FEV1) measurements over three days.
- Day 3 involved a hypertonic saline challenge, with FEV1 monitored for 12 hours post-challenge and compared to control day measurements.
Main Results:
- No significant decrease in FEV1 values was observed in any subject following the hypertonic saline challenge.
- Statistical analysis, including a nonparametric approach, confirmed the absence of a detectable late asthmatic response.
Conclusions:
- A late asthmatic response is unlikely to occur 4-12 hours after a 4.5% saline challenge in children with mild to moderate bronchial hyperresponsiveness.
- These findings contribute to a better understanding of airway responses to hypertonic saline in pediatric populations.
Abstract:
Hypertonic saline challenge has become a standardized method for measuring airway responsiveness. However, there is still uncertainty about the occurrence of a late asthmatic response. Therefore, the present study was designed to assess a possible late asthmatic response after hypertonic saline challenge in children. Twenty-one children with mild to moderate bronchial hyperresponsiveness were studied. On days 1 and 2, forced expiratory volume in one second (FEV1) was measured hourly from 10:00 h to 22:00 h to assess diurnal variation of lung function. On the third study day, a hypertonic saline challenge was performed and FEV1 was measured as on control days. The possibility of a late asthmatic response was tested by comparing FEV1 levels up to 12 h after the challenge on the intervention day to FEV1 levels on control days. In no subjects were the FEV1 values following the challenge found to be considerably below the individual mean of the control days. Furthermore, a nonparametric approach was applied for each child and the population looked into as a whole. Again, no late asthmatic response was detectable. The results of this study suggest that in children with mild to moderate bronchial hyperresponsiveness a late asthmatic response does not occur 4-12 h after a 4.5% saline challenge.