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Optimal use of tube spacer aerosols in asthmatic children
Insights
Slow inhalation flow rates significantly improve bronchodilator response in children with asthma using metered-dose inhalers with tube spacers. Simpler instructions are needed for effective use of these asthma devices.
Area of Science:
- Pediatric Pulmonology
- Respiratory Medicine
- Pharmacology
Background:
- Metered-dose inhalers (MDIs) with tube spacers are common for delivering asthma medications.
- Optimizing inhalation technique is crucial for effective bronchodilator delivery in pediatric asthma patients.
Purpose of the Study:
- To evaluate the impact of different inhalation techniques on bronchodilator response in asthmatic children using terbutaline via MDI with a tube spacer.
- To identify optimal inhalation parameters for maximizing therapeutic effects.
Main Methods:
- A double-blind, cross-over study involving 15 asthmatic children.
- Assessed bronchodilator response to terbutaline using eight different inhalation modes with an MDI and tube spacer.
- Measured inspiratory flow rates, head position, breath-holding duration, and inhalation volume.
Main Results:
- Significantly greater bronchodilator response was observed with slow inspiratory flow rates (15-30 L/min) compared to high flow rates (>70 L/min) (P < 0.01).
- Head tilting and a 10-second breath-hold did not significantly alter bronchodilation.
- Inhalation from residual volume (RV) or functional residual capacity (FRC), and deep vs. half-maximum inhalation volumes yielded similar bronchodilator effects.
Conclusions:
- Slow inspiratory flow rates are key for effective bronchodilator delivery in pediatric asthma patients using MDI with tube spacers.
- Current instructions for MDI/spacer use may require simplification to enhance patient technique and therapeutic outcomes.
Abstract:
In a double blind cross-over study the bronchodilator response after eight different modes of inhalation of terbutaline from a pressurized aerosol with a tube spacer was assessed in fifteen asthmatic children. Slow inspiratory flow rates (15-30 l/min) were found to be associated with a statistically significant increase in response when compared with flow rates higher than 70 l/min (P less than 0.01). Tilting the head back during the inhalations and a breath-holding pause of 10 sec after the inhalation had no significant effect upon bronchodilation. In addition, bronchodilation was the same whether the children inhaled from RV or FRC, and whether they inhaled as deeply possible or only to about half the maximum volume. The results suggest that efforts should be made to develop a new and more simple set of instructions for the use of tube spacer aerosols.