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Pulsatile poststenotic flow studies with laser Doppler anemometry.

S A Ahmed, D P Giddens

    Journal of Biomechanics
    |January 1, 1984
    PubMed
    Summary
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    Pulsatile flow in narrowed arteries shows distinct patterns. Unlike steady flow, significant constrictions do not cause persistent flow separation, suggesting organized flow disturbances are key for detecting arterial stenosis.

    Area of Science:

    • Fluid dynamics
    • Biomedical engineering
    • Cardiovascular research

    Background:

    • Understanding blood flow dynamics is crucial for diagnosing arterial diseases.
    • Pulsatile flow in stenotic arteries presents complex hemodynamic challenges.
    • Previous studies often focused on steady flow or turbulence in arterial stenosis.

    Purpose of the Study:

    • To investigate pulsatile flow patterns distal to axisymmetric constrictions.
    • To analyze velocity profiles and wall shear rates in varying degrees of stenosis.
    • To compare pulsatile flow behavior with steady flow conditions and assess turbulence generation.

    Main Methods:

    • Utilized laser Doppler anemometry to measure velocity waveforms.
    • Employed ensemble averaging for velocity data acquisition.

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  • Studied stenosis models with 25%, 50%, and 75% area reduction.
  • Computed wall shear rates from near-wall velocity gradients.

    • Main Results:

    • No permanent poststenotic flow separation observed, even in severe constrictions.
    • Wall shear stress peaked near the stenosis throat, decreasing in the poststenotic region.
    • Turbulence was detected only in the 75% stenosis model during specific cycle phases.
    • Organized flow disturbances, not just turbulence, appear significant for stenosis detection.

    Conclusions:

    • Pulsatile flow dynamics in stenoses differ significantly from steady flow.
    • Identifying organized flow disturbances may be more critical than turbulence for diagnosing mild to moderate arterial stenosis.
    • Findings have implications for understanding atherogenesis in animal models of aortic coarctation.