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Assessing abdominal aorta narrowing using computational fluid dynamics.

Mohammad Al-Rawi1, Ahmed M Al-Jumaily2

  • 1Manukau Institute of Technology, Auckland, New Zealand.

Medical & Biological Engineering & Computing
|August 31, 2015
PubMed
Summary

Arterial blockage in the abdominal aorta significantly alters blood pressure waves and reduces systolic blood pressure in the femoral artery, especially with over 20% narrowing. This study reveals critical hemodynamic changes due to arterial narrowing.

Keywords:
Arterial blockageAtherosclerosisCFDPulse wave

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Area of Science:

  • Cardiovascular Physiology
  • Biomedical Engineering
  • Medical Imaging

Background:

  • Abdominal aortic blockages can significantly impact systemic hemodynamics.
  • Understanding pressure wave propagation is crucial for diagnosing and managing arterial diseases.
  • Non-invasive and invasive methods are essential for monitoring cardiovascular health.

Purpose of the Study:

  • To investigate the effects of abdominal aortic stenosis on blood pressure waves in accessible arteries.
  • To correlate arterial blockage severity with changes in blood pressure and arterial wall mechanics.
  • To validate a computational fluid dynamics model for simulating arterial blockage conditions.

Main Methods:

  • Surgical induction of arterial blockages in Wistar rats.
  • Invasive blood pressure measurement in the femoral artery.
  • Magnetic resonance imaging (MRI) and microscopy for arterial dimensions.
  • 3D computational fluid dynamics (CFD) modeling.

Main Results:

  • Blockages exceeding 20% lumen diameter significantly altered pressure waves and reduced systolic blood pressure in the femoral artery.
  • High wall shear stresses and low circumferential strains were observed at the blockage site.
  • CFD model validation confirmed the correlation between blockage severity and hemodynamic changes.

Conclusions:

  • Abdominal aortic stenosis markedly affects distal blood pressure dynamics.
  • Significant arterial narrowing triggers detrimental mechanical stresses and strains.
  • The validated CFD model provides a tool for further research into arterial stenosis.