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Low frequency flow fluctuations in saccular aneurysms.

H J Steiger, H J Reulen

    Acta Neurochirurgica
    |January 1, 1986
    PubMed
    Summary
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    Intra-operative Doppler recordings revealed periodic flow fluctuations in cerebral saccular aneurysms. These flow instabilities may contribute to aneurysm wall vibrations, progression, and rupture.

    Area of Science:

    • Neurosurgery
    • Biomedical Engineering
    • Fluid Dynamics

    Background:

    • Cerebral saccular aneurysms pose a significant risk of rupture and hemorrhage.
    • Understanding intra-aneurysmal flow dynamics is crucial for predicting aneurysm progression.

    Purpose of the Study:

    • To investigate intra-operative flow patterns within cerebral saccular aneurysms using Doppler recordings.
    • To correlate observed flow characteristics with aneurysm morphology and potential for rupture.

    Main Methods:

    • Intra-operative Doppler recordings were performed on 12 patients with cerebral saccular aneurysms.
    • Flow patterns were analyzed for periodicity and irregularities.
    • Flow behavior was simulated in glass models at a Reynolds number of 300.

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    Main Results:

    • Distinct periodic flow fluctuations (60-150 msec periods) were observed in 6 patients.
    • Flow irregularities were detected acoustically in 3 additional patients.
    • Flow instabilities in models occurred in deceleration zones, without full turbulence.

    Conclusions:

    • Intra-aneurysmal flow fluctuations may induce wall vibrations.
    • These flow dynamics are implicated in aneurysm progression and rupture risk.
    • Further research is needed to fully elucidate the role of flow instabilities in aneurysm pathophysiology.