Metered-dose inhalers: the specified number of sprays

JAMA The Journal of the American Medical Association (Impact Factor: 35.29). 03/1993; 269(12):1506.
Source: PubMed
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    Journal of Allergy and Clinical Immunology 09/1995; 96(2):284-7. DOI:10.1016/S0091-6749(95)70207-5 · 11.48 Impact Factor
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    ABSTRACT: To characterize and evaluate canister floating patterns of three commercially available metered-dose inhalers (MDIs) with varying amounts of medication remaining. Four canisters each of three asthma medications were studied. MDIs were actuated every 30 seconds to 60 seconds, and canisters were weighed and floated at 100%, 75%, 66%, 50%, 33%, 25%, 10%, and 0% of remaining labeled actuations. Position of the canisters and percentage submersion in water were recorded. Controlled laboratory. We observed differences among the products with regard to canister floating behavior at varying levels of fullness. All canisters were completely submerged with the nozzle up at two-thirds full and greater. The canisters remained nozzle-up and were submerged to varying levels at the half-full point. When observed at less than half full, canisters inverted and floated nozzle down. Positions of the canisters varied among products at less than half full. No canister was fully tilted when all labeled actuations were used. Float characteristics are product-specific and a function of canister size, design, content, and method of testing. Clinicians and asthma educators should not advise patients to use a float test to assess the amount of medication remaining in an MDI. Recommendations from the National Asthma Education and Prevention Program of the National Heart, Lung, and Blood Institute suggest that the only reliable method for determining the number of doses remaining in a canister is to subtract the number of doses used from the number available.
    Journal of the American Pharmaceutical Association 01/2002; 42(4):582-6. · 1.24 Impact Factor
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    ABSTRACT: Currently, patients have to keep track of doses to determine when to replace their metered-dose inhalers (MDIs). This study evaluated the performance and patient satisfaction of a novel MDI with an integrated dose counter. In an open-label study at 38 outpatient centres, patients > or =12 years old with asthma or chronic obstructive pulmonary disease (COPD) received two actuations of fluticasone propionate/salmeterol 125/25 microg (115/21 microg ex-actuator) hydrofluoroalkane (ADVAIR) HFA) via MDI with counter twice a day until all 120 actuations were completed. Concordance between counter and diary recordings in patients who reported use of > or =90% of labelled actuations (completer population, n = 228) was high (discrepancy rate of 0.94%) and the incidence of device firing without changes in counter readings was low (0.13%). Mean expected actuations based on canister weights (114) were slightly lower than mean counter (121) and diary reported actuations (120). Upon study completion, 95% of patients were satisfied with the dose counter and 92% agreed it would help prevent them from running out of medication. Safety assessments (intent-to-treat population, n = 237) indicated that the drug was well tolerated. This integrated MDI counter may help patients maintain better disease control by enabling them to accurately track their medication supply.
    International Journal of Clinical Practice 11/2006; 60(10):1218-24. DOI:10.1111/j.1742-1241.2006.01138.x · 2.57 Impact Factor
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