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Effects of circulatory disturbance on the cochlea
1Department of Otorhinolaryngology, Hamamatsu University School of Medicine, Japan.
Insights
Investigating circulatory disturbance in cats revealed that reduced cochlear blood flow, particularly from internal auditory artery occlusion, significantly impacts cochlear action potentials (AP). This highlights the vulnerability of cochlear function to blood supply disruptions.
Area of Science:
- Oto-neuroscience
- Vascular biology
- Auditory physiology
Background:
- The cochlea's function is critically dependent on a stable blood supply.
- Circulatory disturbances in the vertebrobasilar system can potentially affect cochlear function.
- Understanding the specific vascular pathways influencing the cochlea is essential for diagnosing and treating hearing loss.
Purpose of the Study:
- To investigate the impact of circulatory disturbances in the basilar artery system on cochlear function.
- To quantify changes in cochlear blood flow and cochlear action potential (AP) during arterial occlusion.
- To determine the relationship between the degree of blood flow reduction and the alteration in cochlear AP.
Main Methods:
- Occlusion of the basilar, anterior cerebellar, and internal auditory arteries in feline models.
- Measurement of cochlear blood flow.
- Measurement of cochlear action potential (AP).
Main Results:
- Occlusion of the internal auditory artery resulted in the greatest decrease in cochlear blood flow.
- Occlusion of the basilar artery resulted in the least decrease in cochlear blood flow.
- A direct correlation was observed between the rate of decrease in cochlear blood flow and the degree of AP alteration.
Conclusions:
- Circulatory disturbances within the basilar artery system significantly affect cochlear function.
- The internal auditory artery plays a crucial role in maintaining cochlear blood supply.
- The severity of cochlear action potential changes is directly related to the extent of blood flow reduction.
Abstract:
In order to determine the effects on the cochlea of circulatory disturbance in the basilar artery system, the cochlear action potential (AP) and the cochlear blood flow were measured in cats with the artery occluded. The occlusion was performed in the basilar, the anterior cerebellar and in the internal auditory arteries. During occlusion the decrease in the cochlear blood flow was greatest in the internal auditory artery and the least in the basilar artery. While the cochlear blood flow showed various levels of decrease depending on the occlusion site and the individual animal, the degree of AP alteration correlated with the decreased rate in the cochlear blood flow.