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Assessing Tissue Hydration Dynamics Based on Water/Fat Separated MRI.

Markus Karlsson1, Ainhoa Indurain2,3,4, Thobias Romu1,5,6

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Journal of Magnetic Resonance Imaging : JMRI
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Summary

This study introduces relative lean water signal (LWSrel), an MRI technique to measure tissue hydration in hemodialysis patients. LWSrel effectively tracks hydration changes during dialysis, offering a more accurate assessment of fluid status.

Keywords:
chemical shift imagingdialysisfat-water imagingover hydration

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Area of Science:

  • Biomedical Imaging
  • Nephrology
  • Body Composition Analysis

Background:

  • Optimal fluid status is crucial in hemodialysis, yet accurate assessment remains challenging.
  • Current clinical evaluations and diagnostic tools have limitations in determining precise hydration status.
  • There is a need for more accurate methods to monitor fluid balance in hemodialysis patients.

Purpose of the Study:

  • To introduce and validate relative lean water signal (LWSrel) as a novel MRI-based method for measuring tissue hydration.
  • To assess the efficacy of LWSrel in differentiating hydration levels between healthy individuals and hemodialysis patients.
  • To evaluate the sensitivity of LWSrel to fluid volume changes before and after hemodialysis treatment.

Main Methods:

  • A prospective study involving 16 healthy subjects and 11 hemodialysis patients.
  • Utilized 3 Tesla MRI with a 3D spoiled gradient echo sequence to acquire fat-referenced images.
  • Calculated LWSrel from segmented adipose tissue and muscle volumes; compared with bioimpedance-based body composition monitor (BCM) overhydration.

Main Results:

  • Dialysis patients exhibited significantly higher LWSrel in adipose tissue compared to healthy controls (246.8% vs. 100.0%).
  • LWSrel significantly decreased post-dialysis, correlating with ultrafiltration volume and BCM overhydration (r=0.87 and r=0.66, respectively).
  • Thigh and calf muscle volumes also showed significant decreases after dialysis (3.78% and 2.02%, respectively).

Conclusions:

  • MRI-based LWSrel measurements are sensitive to hydration variations in hemodialysis patients.
  • LWSrel demonstrates potential as an accurate tool for monitoring tissue hydration and fluid status during hemodialysis.
  • This technique may improve the management of fluid balance in patients undergoing hemodialysis.