Abstract | BACKGROUND: Decreasing electrostatic charge on valved holding chambers increases the amount of drug delivered. However, there are no data demonstrating that this increases bronchodilatation. OBJECTIVE: METHODS: This randomized double-blind, double-dummy crossover study included subjects, 18-40 years old, with nocturnal bronchospasm (20% overnight decrease in peak flow on 3 of 7 nights during run-in), FEV(1) 60-80% predicted during the day, and ≥ 12% increase after albuterol. Subjects slept in the clinical research center up to 3 nights for each treatment. FEV(1) and heart rate were measured upon awakening spontaneously or at 4:00 am, and 15 min after each dose of 1, 2, and 4 cumulative puffs of albuterol via metered-dose inhaler. The drug was administered through an anti-static valved holding chamber (AeroChamber Plus Z-Stat) or a conventional valved holding chamber containing a static charge (AeroChamber Plus). RESULTS: Of 88 consented subjects, 11 were randomized and 7 completed the study. Most exclusions were due to lack of objective evidence of nocturnal bronchospasm. Upon awakening, FEV(1) was 44 ± 9% of predicted before the anti-static chamber and 48 ± 7% of predicted before the static chamber. The mean ± SD percent increase in FEV(1) after 1, 2, and 4 cumulative puffs using the anti-static versus the static chamber, respectively, were 52 ± 26% versus 30 ± 19%, 73 ± 28% versus 48 ± 26%, and 90 ± 34% versus 64 ± 35%. The point estimates for the differences (and 95% CIs) between the devices (anti-static vs static) were 21% (4-38%) (P = .03), 23% (6-41%) (P = .02), and 25% (7-42%) (P = .01) for 1, 2, and 4 cumulative puffs, respectively. There was no significant difference in heart rate between treatments. CONCLUSIONS:
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Authors | Sreekala Prabhakaran, Jonathan Shuster, Sarah Chesrown, Leslie Hendeles |
Journal | Respiratory care
(Respir Care)
Vol. 57
Issue 8
Pg. 1291-6
(Aug 2012)
ISSN: 0020-1324 [Print] United States |
PMID | 22348270
(Publication Type: Journal Article, Randomized Controlled Trial, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, Non-P.H.S.)
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Chemical References |
- Bronchodilator Agents
- Albuterol
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Topics |
- Administration, Inhalation
- Adolescent
- Adult
- Albuterol
(administration & dosage)
- Bronchial Spasm
(drug therapy)
- Bronchodilator Agents
(administration & dosage)
- Cross-Over Studies
- Double-Blind Method
- Female
- Forced Expiratory Volume
(drug effects)
- Humans
- Male
- Nebulizers and Vaporizers
- Respiratory Function Tests
- Static Electricity
- Treatment Outcome
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