Measuring Peak Inspiratory Flow in Patients with Chronic Obstructive Pulmonary Disease

Area of Science:

• Respiratory Medicine
• Pharmacology
• Medical Devices

Background:

• Dry powder inhalers (DPIs) require adequate inspiratory flow for effective lung drug delivery.
• Peak inspiratory flow (PIF) is a critical parameter for DPI efficacy in chronic obstructive pulmonary disease (COPD) management.
• Current methods for assessing PIF in COPD patients are not standardized, leading to inconsistencies.

Purpose of the Study:

• To evaluate existing recommendations and applied methods for measuring PIF in COPD patients using DPIs.
• To identify variations and inconsistencies in PIF assessment techniques.
• To propose standardized recommendations for PIF measurement in clinical practice and research.

Main Methods:

• Review of Instructions for Use (IFU) for the In-Check™ DIAL device and prescribing information for eight US-approved COPD DPIs.
• Systematic PubMed search (inception to August 31, 2021) for studies measuring PIF in COPD patients using the In-Check™ DIAL or DPIs.
• Analysis of 47 applicable studies to evaluate applied PIF assessment approaches.

Main Results:

• Significant variability and vagueness were found in instructions for DPI use, including patient positioning, exhalation, inhalation maneuver, and breath-hold.
• Considerable heterogeneity exists in how PIF is measured across clinical and real-life studies.
• Lack of standardized PIF measurement hinders comparability and reliability of data.

Conclusions:

• There is a critical need for standardized PIF measurement techniques for DPIs in COPD.
• Standardization will improve the accuracy and reliability of PIF values in research and clinical settings.
• Proposed recommendations aim to standardize PIF measurement for better DPI use in COPD management.