Dynamic contrast-enhanced MRI quantifies microvascular changes in lung transplant recipients with chronic lung...

Area of Science:

• Pulmonary Medicine
• Radiology
• Transplantation Immunology

Background:

• Chronic lung allograft dysfunction (CLAD) diagnosis lacks sensitive biomarkers.
• Microvascular perfusion and extracellular space changes are implicated in CLAD pathophysiology.

Purpose of the Study:

• To evaluate Dynamic Contrast-Enhanced Magnetic Resonance Imaging (DCE-MRI) for detecting microvascular and extracellular matrix changes in CLAD.
• To assess the utility of DCE-MRI parameters in differentiating CLAD patients from healthy controls.

Main Methods:

• DCE-MRI was performed on 10 participants with CLAD and 12 without CLAD.
• Key perfusion parameters including peak enhancement (PE), wash-in rate (k washin ), area under the curve (iAUC 60 ), and wash-out rate (k washout ) were calculated.
• Lung regions of interest were analyzed for signal intensity changes over time.

Main Results:

• Participants with CLAD showed significantly lower PE, slower k washin , and reduced iAUC 60 compared to controls, indicating impaired microvascular perfusion.
• A reduced k washout was observed in CLAD participants, suggesting an increased extracellular extravascular space.
• These quantitative MRI findings correlate with known pathophysiological changes in CLAD.

Conclusions:

• DCE-MRI can detect and quantify microvascular perfusion abnormalities and changes in extracellular space characteristic of CLAD.
• The study supports DCE-MRI as a valuable, non-invasive tool for assessing CLAD pathophysiology.
• Further research can explore DCE-MRI's role in early CLAD detection and monitoring treatment response.