Levalbuterol Aerosol Delivery With a Nonelectrostatic Versus a Nonconducting Valved Holding Chamber
Bibliographic record
Abstract
BACKGROUND: Hydrofluoroalkane-propelled levalbuterol (Xopenex) aerosol is a recently approved formulation for delivery via metered-dose inhaler for the treatment or prevention of bronchospasm in adults, adolescents, and children > or = 4 years of age who have reversible obstructive airway disease. Valved holding chambers (VHCs) made from conventional polymers are susceptible to accumulation of electrostatic charge, which can be minimized by prewashing with ionic detergent, but it may be desirable to be able to use the product straight from the package, without pretreatment, especially during an exacerbation. METHODS: We studied the performance of the AeroChamber Plus and AeroChamber Max VHCs in delivering hydrofluoroalkane-propelled levalbuterol. Both VHCs were prewashed, rinsed, and drip-dried before testing. The AeroChamber Max is manufactured from charge-dissipative material and was therefore also evaluated without prewashing. Aerosol samples were collected at 28.3 L/min with an Andersen 8-stage cascade impactor, per the procedure specified in Chapter 601 of the United States Pharmacopeia. RESULTS: The mean +/- SD fine-particle mass (mass of aerosol particles < 4.7 microm aerodynamic diameter) values were 33.5 +/- 1.4 microg and 36.3 +/- 1.1 microg with the AeroChamber Max, without and with wash/rinse pretreatment, respectively, and 28.5 +/- 2.4 microg with the prewashed AeroChamber Plus. CONCLUSIONS: We think the small differences we observed are unlikely to be of clinical importance, given the inter-patient variability seen with inhaled drug delivery. The performance of the AeroChamber Max was substantially comparable whether or not it was prewashed.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".