| Document ID (ISN) | 19363 |
| CIS number |
73-199 |
| ISSN - Serial title |
Naučni trudove na NIOTPZ - Razdel uši-nos-gărlo i stomatologija |
| Year |
1970 |
| Convention or series no. |
|
| Author(s) |
Batolska A., Begov A. |
| Title |
Ultrasound and the hearing system |
| Original title |
Ultrazvuk i sluh [in Bulgarian] |
| Bibliographic information |
1970, Vol.18, p.18-22. Illus. 8 ref. |
| Abstract |
Low levels of ultrasound accelerate the normal biological processes, and high levels produce protoplasmic cellular lesions due to mechanical and chemical factors (vacuolisation and tissue necrosis). Study of hearing and certain biological indices in 41 subjects exposed to ultra-sound, broken down into groups by age and duration of exposure, showed that the most frequent complaints were tinnitus and reduced auditory acuity. After the day's work, the audiogram curve increased 50dB for high frequencies, remained stationary for medium frequencies and increased only insignificantly for the low frequencies. These changes vary between individuals and in some cases may be absent. No changes in erythrocyte haemoglobin content were found. In more than one-third of the subjects there was a tendency to acid haemolysis. In a number of cases there was a fall in reduced glutathion which is attributed to erythrocyte fragility. No clear correlation was found between biochemical indices and temporary hearing disorders. |
| Descriptors (primary) |
ultrasound; audiology; hearing disorders |
| Descriptors (secondary) |
comparative study |
| Document type |
- |
| Subject(s) |
Noise, hearing and vibration
|
| Broad subject area(s) |
|
| Browse category(ies) |
Noise
Diseases of the ear and hearing damage
|
