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Which Came First, Age-Related Hearing Loss with Tinnitus or Cognitive Impairment? What are the Potential Pathways?
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Which Came First, Age-Related Hearing Loss with Tinnitus or Cognitive Impairment? What are the Potential Pathways?
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Journal Article
Which Came First, Age-Related Hearing Loss with Tinnitus or Cognitive Impairment? What are the Potential Pathways?
2023
Overview
Research on the causal relationship between age-related hearing loss (ARHL) and/or tinnitus and dementia is an important and fast-moving field. In this opinion paper, the up-to-date evidence and potential mechanisms for the bidirectional relationship are reviewed. We also present several critical factors that increase the challenges of understanding the causal relationship. These factors include common causes (such as aging, frailty, vascular impairment, and chronic inflammation), auditory and cognitive reserves, and the difficulty in distinguishing central auditory processing disorder (CAPD) from cognitive impairment. Finally, based on cumulative evidence, we propose an integrated mechanism in which the central auditory system might be the common target of both peripheral auditory impairment and dementia or its precursor. There is a bidirectional interaction between the peripheral and central auditory systems and between the central auditory systems and the cognitive brain. CAPD causes the depletion of auditory and cognitive reserves, and indirectly affects the peripheral auditory system via the auditory efferent system. According to the proposal, multimodal intervention might be beneficial for patients with ARHL and/or tinnitus and cognitive impairment, apart from hearing restoration by hearing aids or cochlear implants.
