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[Delayed damage of ionizing radiation on the inner ear]
Zhonghua Er Bi Yan Hou Ke Za Zhi
|August 1, 1997
Summary
Ionizing radiation can cause delayed inner ear damage, including hearing loss and vestibular dysfunction, in guinea pigs. This impairment is linked to radiation-induced vascular lesions affecting oxygen supply and metabolism.
Area of Science:
- Ototoxicology
- Radiation Biology
- Neuroscience
Context:
- Radiotherapy often involves ionizing radiation, which can affect non-target organs.
- The inner ear is susceptible to radiation-induced damage, but the delayed effects and mechanisms are not fully understood.
- Fractional doses of gamma radiation are commonly used in radiotherapy.
Purpose:
- To investigate the delayed functional and structural changes in the inner ear following fractional gamma radiation exposure.
- To elucidate the mechanism of radiation-induced inner ear impairment.
Summary:
- Guinea pigs received 60 Gy of gamma radiation in fractional doses (2 Gy/day).
- Auditory function (assessed by electrocochleography) and vestibular function (assessed by electronystagmography) were monitored for 8 months.
- Histological examination revealed degeneration of stria vascularis, hair cells, and vestibular cells, particularly in the cochlea's basal turn.
Impact:
- Radiation exposure can lead to significant, delayed hearing loss and vestibular dysfunction.
- Radiation-induced vascular lesions, impairing oxygen supply and metabolism, are suggested as the primary mechanism.
- Findings suggest that routine radiotherapy doses may cause long-term inner ear impairment.