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Related Experiment Videos

Aortic origin of innocent murmurs.

P D Stein, H N Sabbah

    The American Journal of Cardiology
    |May 4, 1977
    PubMed
    Summary

    Innocent murmurs are more likely generated by the aortic valve than the pulmonary valve. This is possibly due to the pulmonary artery's greater compliance, which may dampen turbulence.

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    Area of Science:

    • Cardiovascular Physiology
    • Acoustic Cardiology
    • Pediatric Cardiology

    Background:

    • Intraarterial sound measurement provides insights into valve function.
    • Innocent murmurs are common in children and typically benign.
    • Distinguishing innocent murmurs from pathological ones is clinically important.

    Purpose of the Study:

    • To investigate the origin of innocent murmurs by measuring intraarterial sound intensity.
    • To compare sound intensity above the aortic and pulmonary valves.
    • To assess the effect of increased blood flow on murmur intensity.

    Main Methods:

    • Measured intraarterial sound intensity distal to aortic and pulmonary valves in 10 subjects.
    • Recorded sounds at rest and during increased flow (post-premature ventricular contraction).
    • Correlated sound intensity with murmur grade and location.

    Main Results:

    • Intraarterial sound intensity was significantly higher above the aortic valve than the pulmonary valve at rest.
    • Audible murmurs were of greater amplitude in the aorta than the pulmonary artery.
    • Increased flow post-premature ventricular contraction amplified aortic murmurs to grade 1-2 levels, while pulmonary murmurs remained inaudible.

    Conclusions:

    • Innocent murmurs are likely generated at the aortic valve.
    • The pulmonary artery's higher compliance may dampen turbulent flow, reducing murmur intensity.
    • These findings aid in differentiating innocent murmurs from pathological conditions.

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