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MRI-derived regional flow-volume loop parameters detect early-stage chronic lung allograft dysfunction.

Tawfik Moher Alsady1,2, Andreas Voskrebenzev1,2, Mark Greer2,3

  • 1Institute of Diagnostic and Interventional Radiology, Hanover Medical School, Hanover, Germany.

Journal of Magnetic Resonance Imaging : JMRI
|May 29, 2019
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Summary

Early detection of chronic lung allograft dysfunction (CLAD) after lung transplantation is possible using MRI. This study shows MRI-derived regional ventilation parameters can identify CLAD before changes in lung function tests.

Keywords:
Fourier decomposition MRIFunctional lung MRIPREFUL-MRIchronic lung allograft dysfunctionflow-volume loopslung transplantation

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Area of Science:

  • Radiology
  • Pulmonology
  • Medical Imaging

Background:

  • Chronic lung allograft dysfunction (CLAD) significantly impacts long-term survival after lung transplantation (LTx).
  • Early detection of CLAD is crucial for timely medical intervention to prevent irreversible graft damage.
  • Pulmonary function testing (PFT) assesses global lung function, potentially missing early regional changes.

Purpose of the Study:

  • To determine if MRI-derived regional flow-volume dynamics can detect early CLAD stages.
  • To correlate MRI findings with PFT-based CLAD diagnoses.

Main Methods:

  • Retrospective analysis of MRI datasets from 62 lung transplant recipients (29 with CLAD).
  • Utilized phase-resolved functional lung MRI (PREFUL-MRI) to generate fractional ventilation (FV) maps and regional flow-volume loops (rFVL).
  • Assessed regional lung ventilation parameters using FV and rFVL data.

Main Results:

  • Regional flow-volume loop (rFVL)-based parameters significantly differentiated between CLAD presence and absence (P < 0.003).
  • PREFUL-MRI identified ventilation dynamics and heterogeneity sensitive to early CLAD stages.
  • MRI parameters showed potential for detecting CLAD before global PFT changes.

Conclusions:

  • Contrast media-free PREFUL-MRI is a sensitive tool for detecting early CLAD.
  • MRI-derived regional ventilation parameters can identify CLAD earlier than traditional PFT.
  • This technique may improve monitoring and management of lung transplant recipients.