A method for MRI-guided bronchoscopy to identify obstructed airway segments

Area of Science:

• Pulmonary Medicine
• Medical Imaging
• Respiratory Research

Background:

• Conventional bronchoscopy lacks guidance from segmental airway obstruction knowledge.
• Ventilation abnormalities (hyperpolarized gas MRI) and air trapping (CT) correlate with lung function and asthma severity but haven't targeted inflammation.
• Identifying regional differences in airway inflammation is crucial for understanding and treating obstructive lung diseases.

Purpose of the Study:

• To evaluate the feasibility of using 3He MRI and CT imaging to guide bronchoscopy.
• To compare inflammatory response, morphology, and cellular activity in poorly-ventilated versus well-ventilated lung regions.
• To identify distinct airway obstruction phenotypes based on imaging and cellular markers.

Main Methods:

• Eleven participants (9 with asthma) underwent 3He MRI and/or CT after recovery from a cold.
• Bronchoscopy was performed, guided by imaging findings of ventilation defects.
• Bronchoalveolar lavage fluid was analyzed for cellular content and inflammatory mediators; airway morphology was assessed.

Main Results:

• Neutrophils and granulocytes trended higher in poorly-ventilated (defect) compared to well-ventilated (control) regions.
• Specific inflammatory mediators (15-epi-LXA4, LXA4) were significantly different between defect and control sites.
• Correlations were found between specific immune cells (macrophages, neutrophils, eosinophils) and inflammatory mediators.

Conclusions:

• Image-guided bronchoscopy using 3He MRI and CT is feasible for differentiating lung regions.
• This approach can reveal distinct inflammatory profiles associated with airway obstruction phenotypes.
• Findings support the use of imaging to guide targeted interventions in obstructive lung diseases.