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Inhalation Profiles Through a Dry Powder Inhaler: Relation Between Inhalation Technique and Spirometric Measures
Agata Dorosz1, Tomasz Urbankowski2, Krzysztof Zieliński3
1Faculty of Chemical and Process Engineering, Warsaw University of Technology, Warsaw, Poland.
Journal of Aerosol Medicine and Pulmonary Drug Delivery
|April 20, 2021
Summary
Understanding inhalation flow profiles in asthma patients is key for effective dry powder inhaler (DPI) use. Even with incomplete exhalation, patients can achieve sufficient inhaled volume for successful DPI performance.
Area of Science:
- Pulmonary Medicine
- Respiratory Physiology
- Pharmacology
Background:
- Effective drug delivery via dry powder inhalers (DPIs) to the lungs is crucial for asthma management.
- Understanding the relationship between patient inhalation technique and device performance is essential for optimizing therapy.
Purpose of the Study:
- To investigate the correlation between spirometric measures and inhalation flow profiles in asthma patients using a low-resistance DPI.
- To compare inhalation profile parameters between optimal and suboptimal inhalation techniques.
Main Methods:
- Healthy volunteers and asthma patients performed spirometry and a modified flow-volume test to establish exhalation reference levels (to residual volume [RV] and 50% to RV).
- Inhalation profiles (volumetric airflow vs. time) were recorded using spirometry software, extracting parameters like time to peak inspiratory flow (PIFinh), time of PIFinh (tPIFinh), total inhalation time (T), and inhaled volume (V).
Main Results:
- Significant relationships were found between spirometric indices and inhalation parameters for a low-resistance DPI.
- While incomplete exhalation (50% to RV) did not significantly impact initial flow dynamics (PIFinh, tPIFinh), it led to decreased total inhalation time (T) and inhaled volume (V), which remained sufficient for DPI function.
- Both full exhalation to RV and partial exhalation to 50% of RV preceding inhalation supported effective low-resistance DPI usage.
Conclusions:
- Spirometric measures are significantly related to inhalation profiles in asthma patients using low-resistance DPIs.
- Low-resistance DPIs appear forgiving of suboptimal inhalation techniques, as even incomplete exhalations can result in adequate inhaled volumes for effective drug delivery.
- These findings suggest that patients with asthma can achieve successful DPI use even without perfect inhalation technique.
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