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Related Experiment Videos

Cochlear blood circulation studied with microspheres.

E Hultcrantz, C Angelborg

    ORL; Journal for Oto-Rhino-Laryngology and Its Related Specialties
    |January 1, 1978
    PubMed
    Summary
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    Cochlear blood flow is unaffected by middle ear issues or otic capsule damage. Smaller microspheres are preferred for accurately measuring cochlear blood circulation, which sympathetic stimulation reduces.

    Area of Science:

    • Otolaryngology
    • Physiology
    • Microcirculation Research

    Background:

    • Understanding cochlear blood flow is crucial for diagnosing and treating hearing disorders.
    • The microsphere method is a common technique for measuring organ blood flow.
    • Factors affecting cochlear microcirculation require further investigation.

    Purpose of the Study:

    • To investigate cochlear blood flow using the microsphere method in guinea pigs, rats, and cats.
    • To compare the efficacy of different microsphere sizes for measuring cochlear blood flow.
    • To assess the impact of middle ear infection and otic capsule perforation on cochlear microcirculation.

    Main Methods:

    • The microsphere method was employed to study cochlear blood flow in multiple animal models.

    Related Experiment Videos

  • Experiments involved comparing results from different microsphere sizes (9- and 15-micrometer).
  • The effects of induced middle ear infection and otic capsule perforation were examined.

    • Main Results:

    • Neither middle ear infection nor otic capsule perforation significantly altered cochlear blood flow.
    • Simultaneous administration of 9- and 15-micrometer microspheres yielded equivalent results, suggesting no significant shunting differences.
    • Cervical sympathetic stimulation in cats reduced cochlear blood flow by 25%.

    Conclusions:

    • The microsphere method is reliable for assessing cochlear blood flow, with smaller spheres being preferable.
    • Cochlear blood flow is robust against common middle ear pathologies.
    • Cochlear vasculature is sensitive to sympathetic nervous system modulation.