Effect of Inhalation Flow Rate on Mass-Based Plume Geometry of Commercially Available Suspension pMDIs

Although high-speed laser imaging is the current standard to characterize the plume angle of suspension-based pressurized metered dose inhalers (pMDIs), this method is limited by the inability to identify the drug content in a droplet and simulate inhalation flow. The Plume Induction Port Evaluator...

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Bibliographic Details
Published in:The AAPS journal 2018-09, Vol.20 (5), p.84-84, Article 84
Main Authors: Moraga-Espinoza, Daniel F., Eshaghian, Eli, Shaver, Albert, Smyth, Hugh D. C.
Format: Article
Language:English
Subjects:
Administration, Inhalation
Aerosols
Albuterol - administration & dosage
Biochemistry
Biomedical and Life Sciences
Biomedicine
Biotechnology
Bronchodilator Agents - administration & dosage
Chemistry, Pharmaceutical - instrumentation
Chemistry, Pharmaceutical - methods
Equipment Design
Humans
Metered Dose Inhalers
Particle Size
Pharmacology/Toxicology
Pharmacy
Pressure
Procaterol - administration & dosage
Research Article
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Summary:Although high-speed laser imaging is the current standard to characterize the plume angle of suspension-based pressurized metered dose inhalers (pMDIs), this method is limited by the inability to identify the drug content in a droplet and simulate inhalation flow. The Plume Induction Port Evaluator (PIPE) is a modified induction port for cascade impactors that allows for the calculation of the angle of a plume based on direct drug mass quantification rather than indirect droplet illumination under airflow conditions. The objective of this study was to investigate the use of the PIPE apparatus to evaluate the effect of airflow on the Mass Median Plume Angle (MMPA) of commercially available suspension-based pMDIs (Ventolin® HFA, ProAir® HFA, and Proventil® HFA). Deposition patterns within PIPE were log-normally distributed allowing for the calculation of the MMPA for the three suspension products. Mass-based plume angles were significantly smaller (narrower angle) when inhalation airflow was used compared to no flow conditions (reduction of MMPA was 8, 16, and 13% for Ventolin® HFA, ProAir® HFA, and Proventil® HFA, respectively). Additionally, new parameters for characterizing plume geometry were calculated (MMPA ex-actuator and plume orientation). Mass-based plume angles of the suspension-based pMDI formulations were highly reproducible and demonstrated the effect of inhalation flow rate. These results suggest that plume geometry tests should be evaluated under flow conditions which is not possible using current methodologies. Graphical Abstract ᅟ
ISSN:1550-7416
1550-7416
DOI:10.1208/s12248-018-0241-6