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English Abstract
Journal Article
Review
[Mechanisms and management of hyperacusis (decreased sound tolerance)].
Acta Otorrinolaringológica Española 2006 October
Hyperacusis is a decreased sound tolerance. Prevalence of the disease is described in 9-15% of the population, but this percentage increases among the tinnitus patients. Pathophysiological mechanisms involve some disruptions in the amplification and regulation processes of the external hair cells or affect the central sound processing at the subcortical level. The role of the serotonin, also involved in other diseases related with hyperacusis (migraine, depression), can be crucial in this disorder. Other theories confirm the effect of the endorphins that activate the excitatory function of the glutamate, the auditory neurotransmitter, increasing its toxicity. The activation of the limbic and autonomic nervous systems produces the emotional reaction of the hyperacusis (anxiety, fear and depression). Proposed treatments are based on acoustic stimulation by a progressive introduction of sound (tinnitus retraining therapy TRT). Noise generators and hearing aids can be fitted in severe cases. The role of some drugs involved in the metabolism of the serotonin open new approaches for the management of hyperacusis.
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