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Cochlear damages caused by vibration exposure.
Seyyed Ali Moussavi Najarkola1, Ali Khavanin2, Ramazan Mirzaei3
1Department of Occupational Hygiene, Collage of Health, Shahid Beheshti University of Medical Sciences, Tehran, IR Iran.
Whole-body vibration exposure caused significant cochlear damage in rabbits, affecting inner and outer hair cells. These findings highlight potential risks of industrial vibration on auditory health.
Area of Science:
- Occupational Health
- Ototoxicology
- Histopathology
Background:
- Excessive industrial vibration poses risks to human health.
- The impact of vibration on cochlear histology remains a debated topic in occupational health.
Purpose of the Study:
- To investigate the effects of whole-body vibration on cochlear histology using an animal model.
- To address limitations in human studies regarding vibration's ototoxic effects.
Main Methods:
- Albino rabbits were exposed to vertical whole-body vibration (1.0 m.s(-2) r.m.s, 4-8 Hz, 8 hrs/day, 5 days).
- Cochleae were extracted, fixed, decalcified, sectioned, and stained for light microscopy.
- Histological analysis compared vibration-exposed and control groups.
Main Results:
- Significant hydropic degeneration and vacuolation of inner hair cells (IHCs) in the vibration group.
- Intercellular edema in supporting cells (SC) and pyknotic nuclei in outer hair cells (OHCs).
- Slight basilar membrane (BM) thickening observed; Tectorial Membrane (TM) remained unaffected.
Conclusions:
- Whole-body vibration exposure can induce cochlear damage in male rabbits.
- Prolonged high-level vibration may lead to subsequent auditory functional impairments.
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