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For humans, this range is approximately 20 Hz to 20 kHz at ~6.5 dB, although a 10 dB correction is often allowed for the elderly. [1] Primary causes of hearing loss due to an impaired sensory system include long-term exposure to environmental noise, which can damage the mechanoreceptors responsible for receiving sound vibrations, as well as ...
A 2020 study suggests that the main cause of presbycusis is the loss of inner ear sensory cellsand that the main cause of this loss is noise exposure. [13] Neural: characterised by degeneration of cells of the spiral ganglion. Strial/metabolic: characterised by atrophy of stria vascularis in all turns of cochlea.
Hypoesthesia or numbness is a common side effect of various medical conditions that manifests as a reduced sense of touch or sensation, or a partial loss of sensitivity to sensory stimuli. In everyday speech this is generally referred to as numbness. [1]
Noise exposure is the cause of approximately half of all cases of hearing loss, causing some degree of problems in 5% of the population globally. [5] The National Institute for Occupational Safety and Health (NIOSH) recognizes that the majority of hearing loss is not due to age, but due to noise exposure.
Most patients have a sensory ataxia, or sensory loss in various extremities, along with mild to moderate muscle weakness, usually starting in the toes and fingers and moving inward. Most patients also present a mild to moderate tremor in the extremities which increases as the disease progresses.
One of the main causes of NC is the onset of LSS in elderly patients. Relative to their respective age groups, 16% of individuals aged less than 40 experience LSS whilst 38.8% of individuals aged over 60 experience LSS. [40] [41] Between the ages of 60 and 69, the prevalence of LSS relative to this population group is 47.2%. [40]
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The causes of nerve damage are grouped into categories including those due to paraneoplastic causes (neuropathy secondary to cancer), immune mediated, infectious, inherited or degenerative causes and those due to toxin exposure. In idiopathic sensory neuronopathy no cause is identified. Idiopathic causes account for about 50% of cases. [2]