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Blood viscosity and sensorineural hearing loss
M Hildesheimer1, F Bloch, C Muchnik
1School of Communication Disorders, Speech, Language and Hearing, Chaim Sheba Medical Center, Tel Hashomer, Israel.
Insights
This study suggests whole blood viscosity may be an etiological factor in unexplained sensorineural hearing loss. Higher blood viscosity was observed in individuals with hearing deterioration compared to controls.
Area of Science:
- Audiology
- Hematology
- Otolaryngology
Background:
- Sensorineural hearing loss can be idiopathic.
- Routine medical checkups include audiological and hematological assessments.
Purpose of the Study:
- To investigate the potential role of whole blood viscosity in unexplained sensorineural hearing loss.
Main Methods:
- Comparison of two matched groups (experimental with hearing loss, control with normal hearing).
- Audiological testing (pure-tone threshold, speech discrimination).
- Hematological tests including whole blood viscosity and hematocrit.
Main Results:
- Experimental group showed statistically significant differences in hearing tests.
- Hematocrit and whole blood viscosity were significantly higher in the experimental group.
- A higher number of subjects with abnormal whole blood viscosity were found in the experimental group.
Conclusions:
- Whole blood viscosity is presented as a potential etiological factor for hearing deterioration.
- Further research is warranted to confirm the link between blood viscosity and hearing loss.
Abstract:
Two groups of 33 subjects each, one experimental and one control, matched one-to-one for age and occupation, were chosen from a large number of subjects who were covered by special insurance for annual medical control at our hospital. The periodical checkups included cardiovascular, nervous, and renal systems, as well as vision and hearing. In addition routine blood tests, including whole blood viscosity, were also performed. The experimental group consisted of subjects in whom a bilateral, slight, and unexplained sensorineural loss of hearing was detected in the routine audiological testing, without any known reason. In the control group, the routine hearing tests demonstrated normal hearing. The differences between the two groups were statistically significant in pure-tone threshold level and in speech discrimination score, when the test was performed at a -5dB signal-to-noise ratio. The results of the vestibular tests were normal in both groups. Hematocrit and whole blood viscosity were slightly but significantly higher in the experimental group if compared with the control group. The number of subjects with abnormal whole blood viscosity results was higher in the experimental group. The whole blood viscosity as the etiological factor responsible for the hearing deterioration is described.