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Related Experiment Videos

Partial standing wave formation above an abdominal aortic stenosis

D L Newman, J R Batten, N L Bowden

    Cardiovascular Research
    |March 1, 1977
    PubMed
    Summary

    Arterial stenosis causes standing waves in pressure and flow. Measurements reveal that diagnostic assessments of vascular obstructions using proximal pressure or flow may be inaccurate if not taken near the stenosis.

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    Area of Science:

    • Biomedical Engineering
    • Cardiovascular Physiology

    Background:

    • Arterial discontinuities, like stenosis, can cause reflections, leading to standing waves.
    • Understanding these reflections is crucial for accurate hemodynamic assessment.

    Purpose of the Study:

    • To investigate the phenomenon of pressure and flow wave reflections from arterial stenosis.
    • To analyze the impact of distance from stenosis on wave characteristics and impedance.

    Main Methods:

    • Experimental stenosis created in the abdominal aorta of dogs.
    • Pressure and flow waves recorded at three sites at varying distances from stenosis.
    • Vasodilation used to minimize peripheral reflections.
    • Impedance and propagation velocity measurements performed.

    Main Results:

    • Standing waves of pressure and flow were observed proximal to the stenosis.
    • Pressure antinodes and flow nodes occurred near the stenosis, with predictable patterns at multiples of lambda/4.
    • Impedance modulus showed fluctuations (maxima/minima) at specific distances from the stenosis.
    • Attenuation of backward-going waves was greater than forward-going waves.

    Conclusions:

    • Stenosis generates standing waves, altering proximal pressure and flow patterns.
    • Diagnostic accuracy of proximal measurements for vascular obstruction is distance-dependent.
    • Reflected wave attenuation influences the reliability of non-invasive assessments.

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