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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