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Diffusion Tensor Cardiovascular Magnetic Resonance in Cardiac Amyloidosis.

Zohya Khalique1,2, Pedro F Ferreira1,2, Andrew D Scott1,2

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Diffusion tensor cardiovascular magnetic resonance (DT-CMR) noninvasively assesses cardiac microstructure in cardiac amyloidosis (CA). DT-CMR biomarkers effectively differentiate CA from hypertrophic cardiomyopathy and reveal distinct pathophysiological mechanisms in transthyretin vs. light chain amyloidosis.

Keywords:
amyloiddiffusion tensor imagingextracellular spacemagnetic resonance imagingmyocardium

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Area of Science:

  • Cardiovascular Imaging
  • Biophysics
  • Medical Diagnostics

Background:

  • Cardiac amyloidosis (CA) involves interstitial myocardial infiltration by light chains or transthyretin.
  • Assessing CA's microstructural impact noninvasively is crucial for diagnosis and management.
  • Diffusion tensor cardiovascular magnetic resonance (DT-CMR) offers a potential method for this assessment.

Purpose of the Study:

  • To evaluate DT-CMR's ability to characterize myocardial microstructure in CA.
  • To differentiate CA from hypertrophic cardiomyopathy using DT-CMR derived biomarkers.
  • To explore the relationship between microstructural changes and specific amyloidosis types.

Main Methods:

  • DT-CMR was performed during diastole and systole in 20 CA patients, 11 with hypertrophic cardiomyopathy, and 10 controls.
  • Key parameters calculated included mean diffusivity, fractional anisotropy, and sheetlet orientation (secondary eigenvector angle).
  • Correlations were analyzed between diffusion parameters, extracellular volume, and circumferential strain.

Main Results:

  • CA showed elevated mean diffusivity and reduced fractional anisotropy compared to controls and hypertrophic cardiomyopathy (P<0.001).
  • In CA, mean diffusivity correlated with extracellular volume (r=0.68, P=0.004), and fractional anisotropy inversely correlated with circumferential strain (r=-0.65, P=0.02).
  • Diastolic secondary eigenvector angle was elevated and its mobility reduced in CA (P<0.001), correlating with extracellular volume in transthyretin amyloidosis but not light chain amyloidosis.

Conclusions:

  • DT-CMR effectively characterizes microstructural changes in CA, identifying disorganized myocardium without contrast agents.
  • Diffusion biomarkers (mean diffusivity, fractional anisotropy) distinguish CA from hypertrophic cardiomyopathy.
  • DT-CMR reveals distinct diastolic dysfunction mechanisms in transthyretin vs. light chain amyloidosis, suggesting type-specific therapeutic targets.