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Impulse propagation in normal and stenosed vessels

D L Newman, S E Greenwald, H T Denyer

    Cardiovascular Research
    |April 1, 1981
    PubMed
    Summary
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    Transient pressure impulse propagation in viscoelastic vessels was studied. Severe stenoses (≥70% occlusion) were detectable within 0.20 m using reflected impulse analysis for vascular occlusive disease detection.

    Area of Science:

    • Biomedical Engineering
    • Cardiovascular Physiology
    • Fluid Dynamics

    Background:

    • Understanding pressure wave propagation in biological tissues is crucial for diagnosing vascular conditions.
    • Viscoelastic properties of blood vessels significantly influence pulse wave dynamics.
    • Non-invasive or minimally invasive methods for detecting vascular abnormalities are highly sought after.

    Purpose of the Study:

    • To investigate the propagation characteristics of transient pressure impulses in viscoelastic media.
    • To determine the feasibility of using impulse reflection for detecting vascular stenoses.
    • To establish criteria for detecting local reflecting sites indicative of vascular occlusive disease.

    Main Methods:

    • Experiments were conducted using water-filled latex rubber tubing and canine aortas.

    Related Experiment Videos

  • A transient pressure impulse (5 ms) was generated using a solenoid-driven hammer.
  • Impulse attenuation and velocity were measured using a catheter-tip manometer at varying distances.
  • Varying degrees of artificial stenoses were introduced to observe impulse reflection.

    • Main Results:

    • Pressure impulse propagation and attenuation were characterized in the tested viscoelastic models.
    • Stenoses caused impulse reflection, with reflected pulse magnitude correlating with stenosis severity.
    • Lesions occluding at least 70% of the lumen were detectable.
    • Detection was most effective for stenoses located within 0.20 m of the impulse source.

    Conclusions:

    • Transient pressure impulse analysis can reveal significant vascular stenoses.
    • The technique shows promise for detecting vascular occlusive disease, particularly localized severe lesions.
    • Optimal detection requires stenoses of ≥70% occlusion and proximity (≤0.20 m) to the impulse generator.