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Numerical simulation of flow oscillations in stenotic arterial segment
1Biomedical Engineering Laboratory, Department of Electronics, Computer Science and Systems, University of Bologna, Viale Risorgimento, 2, 40136 Bologna, Italy.
Computers in Biology and Medicine
|February 13, 2001
Summary
Vascular sounds may be caused by flow oscillations in narrowed arteries. Computer simulations revealed high-frequency flow oscillations in constricted vessels, supporting this hypothesis.
Area of Science:
- Biomedical Engineering
- Fluid Dynamics
- Medical Acoustics
Background:
- Vascular sounds are often associated with arterial stenosis.
- The precise mechanism generating these sounds remains incompletely understood.
- Flow disturbances are hypothesized to play a role in vascular sound production.
Purpose of the Study:
- To investigate the hypothesis that stenosis-induced flow disturbances cause vascular sounds.
- To simulate and analyze flow oscillations in a constricted blood vessel.
Main Methods:
- A computer model based on axi-symmetric Navier-Stokes equations was developed.
- The model incorporated fluid non-linear inertial forces, viscoelastic wall motion, anatomical taper, and proximal/distal circulation.
- Simulations focused on reproducing self-excited flow oscillations in a severe constriction.
Main Results:
- Self-excited flow oscillations with various patterns were successfully reproduced.
- A consistent high-frequency component (100-500 Hz) within the audible range was observed in these oscillations.
- These findings indicate a direct link between flow oscillations and audible frequencies.
Conclusions:
- Numerical results support the hypothesis that vascular sounds originate from high-frequency flow oscillations.
- Stenosis-induced hemodynamic disturbances are a likely source of audible vascular sounds.
- This study provides a computational basis for understanding the generation of vascular sounds.