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Related Experiment Video

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A Large Animal Model for Acute Kidney Injury by Temporary Bilateral Renal Artery Occlusion
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In vivo swine kidney viscoelasticity during acute gradual decrease in renal blood flow: pilot study.

Carolina Amador1, Matthew Urban1, Randall Kinnick1

  • 1Department of Physiology & Biomedical Engineering, Mayo Clinic, Rochester, United States, Ultrasound Research Laboratory.

Revista Ingenieria Biomedica
|February 18, 2014
PubMed
Summary
This summary is machine-generated.

Shearwave Dispersion Ultrasound Vibrometry (SDUV) can measure kidney elasticity. This study shows renal elastic modulus decreases with reduced blood flow, highlighting the need for further hemodynamic variable assessment.

Keywords:
Renal cortexelasticityviscosity

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Area of Science:

  • Biomedical Engineering
  • Medical Imaging
  • Renal Physiology

Background:

  • Kidney mechanical properties are increasingly studied using elasticity imaging.
  • Previous research indicates kidney elastic modulus correlates with disease state and hemodynamic variables in swine.
  • Shearwave Dispersion Ultrasound Vibrometry (SDUV) is an emerging technique for in vivo renal elasticity and viscosity assessment.

Purpose of the Study:

  • To evaluate the feasibility of SDUV for in vivo measurement of healthy swine kidneys.
  • To assess changes in renal elasticity and viscosity during acute, gradual decreases in renal blood flow (RBF).

Main Methods:

  • In vivo SDUV measurements were performed on 5 healthy swine kidneys.
  • Measurements were taken at baseline RBF and with 25%, 50%, 75%, and 100% reductions in RBF.
  • Shear elastic modulus and viscosity were quantified at each RBF level.

Main Results:

  • The shear elastic modulus significantly decreased from 7.04 ± 0.92 kPa at baseline to 3.48 ± 0.20 kPa at 100% RBF decrease.
  • Kidney viscosity remained relatively constant, showing no significant change between baseline (2.23 ± 0.33 Pa·s) and 100% RBF decrease (2.03 ± 0.32 Pa·s).

Conclusions:

  • SDUV is a feasible method for in vivo assessment of renal mechanical properties.
  • Acute reduction in RBF significantly alters swine kidney elastic modulus.
  • Further research should incorporate measurements of local blood flow, pressure, and volume to fully understand the relationship between shear elasticity, viscosity, and acute kidney processes.