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Chicago IL
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Dizziness and Hearing Disorders

Dizziness, hearing disorders and associated terms are often used in a general way covering a large number of categories of disease. In the following we explain about the conditions in a general way. However, in diagnosis and treatment, one must be much more specific in order to narrow down to a smaller potential subset of disorders. For more information, go to our research and teaching website.

For our clinic, visit the index to this site -- Chicago Dizziness and Hearing.

What is dizziness?

Dizziness is used to describe many different feelings, but for the most part, it refers to an impairment in spatial perception and stability, including feeling unsteady on your feet or the surrounding moving around you. Lightheadedness and impending faint is another sensation associated with dizziness. Dizziness may be a fleeting sensation or a prolonged and intense symptom of a wide range of health problems. Dizziness, left untreated, can affect a person's everyday activities, ability to work and quality of life.

Vertigo describes spinning or illusions of movement such as tilting, floating, or impulsion. Dizziness often occurs along with other symptoms such as hearing loss, pressure or fullness in the head, tinnitus, nausea and anxiety.
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What is imbalance?

Imbalance refers to unsteadiness leading to increased risk of fall. Imbalance commonly accompanies dizziness, but can also be independent.

Drop Attacks, a very serious problem, are sudden spontaneous falls while standing or walking, with complete recovery in seconds or minutes. There is usually no recognized loss of consciousness and the event is remembered. It is a symptom, not a diagnosis, and it can have diverse causes.
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What is hearing disorder?

Hearing disorder is an impairment or deafness, a full or partial decrease in the ability to detect or understand sounds. Clinically there are three "pure" types of hearing loss: sensorineural, conductive, and central. A fourth type, denoted "mixed", is simply a combination of sensorineural and conductive.
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Causes of dizziness
Proportion of dizziness attributed to various categories of dizziness varies considerably. Roughly 50% of all dizziness is caused by inner ear disturbances, about 5% by medical and neurological problems each, about 15% by psychological disturbances, and the remainder of the diagnosis (about 25%) is essentially unknown.
  • Otologic causes
    Related to ear, it is the most common type counting for about 50% of all dizziness. BPPV (about 50% of which are inner ear related), menieres disease (about 18% of which are inner ear related), vestibular neuritis and labyrinthitis (about 14% of which are inner ear related), perilymph fistula (rare), bilateral vestibular loss(rare), acoustic neuroma (rare) as well as many other rare disorders belong to this category.
  • Central or neurologic causes
    This type is brain related, counting for 5% of dizziness in general. Stroke, migraine and other disturbances of circulation to the brain (50% of neurologic dizziness), Seizure (5% of neurologic dizziness), MS and other disorders of the white matter (5% of neurologic dizziness), cerebellar degeneration, chiari malformation, and other disorders of the cerebellum, and Mal de Debarquement syndrome (rare) belong to this category.
  • Other medical causes
    Low blood pressure including syncope, and orthostatic hypotension, cardiac arrythmia and medication side effect count for 5% of all dizziness.
  • Psychological causes
    Anxiety and panic disorder, malingering, phobia and somatization syndrome counts for 15% of all dizziness.
  • Unknown causes or diagnoses
    About 25% of causes of dizziness is unknown. Although diagnoses have been attempted, they are often too vague to be meaningful, In our opinion, diagnosis such as multisensory disequilibrium of the elderly, post-traumatic dizziness, and psychogenic dizziness is simply one of exclusion.
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Causes of imbalance
In dizzy patients, most imbalance is caused by inner ear disturbances. When dizziness is not present, most imbalance is central. In older patients, multisensory disturbances are the most common. In younger patients, central problems are more common.
  • Sensory disturbances
    It is seen in the loss of position sense, vestibular sense, visual sensation, or a combination of all three. B12 deficiency (common), peripheral neuropathy (common), bilateral vestibular loss (rare) and dysequilibrium of blind persons belong to this category.
  • Central brain disturbances
    includes the same causes of central dizziness listed above, plus migraine (common), multiple small strokes(common), cerebellar degeneration (moderately common), chiari malformation (moderately common), and other disorders of the cerebellum (moderately common), parkinsonism and related disorders of the basal ganglia (moderately common), hydrocephalus or CSF leak (rare), Mal de Debarquement syndrome (rare), MS and other disorders of the white matter (rare), remote effect of cancer (rare), oculopalatal myoclonus (rare) and orthostatic tremor (extremely rare).
  • Peripheral causes
    Weakness caused by muscle disease, or spinal cord problem, e.g., spinal cord compression (uncommon), tinnitus
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Causes of hearing disorder
The great majority of hearing disturbances are sensorineural, either associated with aging or noise exposure.
  • Conductive type
    The cause is mechanical. It includes ear wax, ear drum perforation, middle ear infection or fluid and inner ear bone (ossicle) disturbance (e.g.otosclerosis).
  • Sensorineural type
    Attributing to hair cells or nerve, this type of hearing loss is seen in presybyacusis (an age related hearing loss), noise trauma, acoustic neuroma (rare), radiation (rare), congenital (rare), and infection due to syphilis (very rare).
  • Central type
    The cause is in the brain, e.g., brainstem and auditory cortex.
  • Psychological type
  • Other type
    Mechanism for some hearing disorders is unclear. Sudden hearing loss belongs to this category.

References

  • Hain TC, Herdman SJ. Dizziness in the Elderly. (Ed Sage JI, Mark MH) Practical Neurology of the Elderly. Marcel Dekker Pub, New York, NY 1996.
  • Hain TC. Vertigo and Disequilibrium. In: Current Treatment in Neurologic Disease, 5th edn, Eds. R. Johnson and J. Griffin, p 8-12, 1997, also In: Current Therapy in Adult Medicine, 4th edn, Kassirir JP and Greene HL, Mosby, p 1358-1361, 1997.
  • Hain TC. Approach to the Vertigo Patient  In J. Biller (ed). Practical Neurology 2nd edition, Lippincott-Raven, Philadelphia, (2008)

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