CEREBRAL CIRCULATION STATE IN PROGRESSIVE SENSONEURAL HEARING LOSS
DOI:
https://doi.org/10.32402/Keywords:
sensorineural hearing loss, SNHL, auditory system, hearing, cerebral circulation.Abstract
OBJECTIVE. The objective of this study is to study rheoencephalography indicators in patients with progressive sensorineural hearing loss.
MATERIALS AND METHODS. Two groups of patients with sensorineural hearing loss (SNHL) were examined by rheoencephalography (REG) using a computer rheograph from the company "DX-systems" (Ukraine): the 1st – 40 people with a stable course, the 2nd - 72 patients with a progressive course, and 15 people from the control group.
RESULTS. The leading etiological factor of SNHL in both groups was vascular disorders, however, in the 2nd group with a progressive course, this cause of hearing impairment was as much as 64.5%, which is significantly higher than in the 1st group (24.9% of cases). Angiospasm phenomena were detected in 43 patients of the 2nd group (59.7% of cases), and venous outflow was impaired in 100% of them. While in the 1st group, angiospasm was detected in 22.5% (9 people), and difficulty in venous outflow – in 62.5% (25 people). Pulse blood filling in the carotid system was mostly maintained satisfactory, and in the vertebrobasilar system there was a decrease, expressed to one degree or another.
In patients with SNHL, according to the results of rheoencephalographic research, significant differences were found in comparison with the control in the indices of DKI, DSI and Ri. Moreover, in patients with a progressive course of SNHL, these changes were significant not only in comparison with the control group, but also with patients with a stable course of SNHL. Therefore, with a progressive course of SNHL, significantly more pronounced disorders of cerebral hemodynamics occur than with a stable one.
CONCLUSIONS.
1. Vascular disorders are the leading cause of the development of SNHL both in stable and, especially, progressive course.
2. In patients with progressive SNHL, there are significantly more pronounced disorders of cerebral hemodynamics than in stable course. They have a significant increase in DKI and DSI and a decrease in Ri, especially in the vertebrobasilar system. This indicates a pronounced increase in the tone of cerebral vessels, difficulty in venous outflow and a decrease in pulse blood filling in patients with progressive SNHL.
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References
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