Visualizing Improvements in Airway Dysfunction After Inhaled Therapy in Patients With Uncontrolled Asthma: A...

Area of Science:

• Pulmonary Medicine
• Medical Imaging
• Respiratory Research

Background:

• Traditional spirometry measures global lung function in asthma but offers limited insight into specific airway dysfunction.
• Hyperpolarized ¹²⁹Xe MRI provides functional imaging of the lungs, enabling quantification of ventilation defects (VDP).
• ¹²⁹Xe MRI is emerging as a sensitive tool to assess airway-level changes in asthma.

Purpose of the Study:

• To review clinical evidence on the impact of inhaled bronchodilator therapies on airway dysfunction in asthma.
• To focus on studies utilizing ¹²⁹Xe MRI to visualize and quantify ventilation defect percent (VDP).
• To highlight the utility of ¹²⁹Xe MRI in assessing treatment response and providing mechanistic insights.

Main Methods:

• Narrative review of clinical studies investigating inhaled bronchodilator therapies in asthma.
• Emphasis on studies employing ¹²⁹Xe MRI to measure ventilation defect percent (VDP).
• Inclusion of data from both controlled clinical trials and real-world settings.

Main Results:

• ¹²⁹Xe MRI VDP is a well-tolerated and sensitive measure for tracking airway functional changes in asthma patients.
• ¹²⁹Xe MRI has demonstrated efficacy in both controlled and poorly controlled asthma populations.
• Single-inhaler triple therapy (fluticasone furoate/umeclidinium/vilanterol) significantly improved ¹²⁹Xe MRI VDP in uncontrolled asthma within 6 weeks.

Conclusions:

• ¹²⁹Xe MRI VDP is a valuable tool for detecting early treatment responses in asthma.
• The combination of long-acting muscarinic antagonists and inhaled corticosteroids addresses inflammatory bronchoconstriction.
• ¹²⁹Xe MRI provides mechanistic insights into how therapies restore airway caliber and function.