SCDS Terms

Autophony is the unusually loud hearing of a person’s own voice, breathing or other self-generated sounds.  Read the full wikipedia entry.

Clouding of consciousness, also known as brain fog or mental fog:  a term used in conventional medicine denoting an abnormality in the “regulation” of the “overall level” of consciousness that is mild and less severe than a delirium. The sufferer experiences a subjective sensation of mental clouding described as feeling “foggy.”  Read the full wikipedia entry.

Dehisce: to split open, rupture or tear.

Fistula: a permanent abnormal passageway between two organs in the body or between an organ and the exterior of the body.

Hyperacusis is a health condition characterized by an over-sensitivity to certain frequency and volume ranges of sound (a collapsed tolerance to usual environmental sound). A person with severe hyperacusis has difficulty tolerating everyday sounds, some of which may seem unpleasantly or painfully loud to that person but not to others. Read the full wikipedia entry.

Nystagmus is a condition of involuntary eye movement, acquired in infancy or later in life, that may result in reduced or limited vision. Due to the involuntary movement of the eye, it is often called “Dancing Eyes.” Read the full wikipedia entry.

Low-Frequency Conductive Hearing Loss: This symptom may be explained by dehiscence acting as a third window. Vibrations entering the ear canal and middle ear abnormally divert through the superior semicircular canal and up into the intracranial space, where they become absorbed instead of being registered as sound in the hearing center, or cochlea.

Oscillopsia is a visual disturbance in which objects in the visual field appear to oscillate. The severity of the effect may range from a mild blurring to rapid and periodic jumping. Read the full wikipedia entry.

semicircular canal is one of three semicircular, interconnected tubes located inside each ear. The three canals are the horizontal semicircular canal (also known as the lateral semicircular canal), superior semicircular canal (also known as the anterior semicircular canal), and the posterior semicircular canalRead the full wikipedia entry.

Superior canal dehiscence syndrome: (SCDS) is a rare medical condition of the inner ear, first described in 1998 by Dr. Lloyd B. Minor of Johns Hopkins University, Baltimore, USA, leading to hearing and balance symptoms in those affected. The symptoms are caused by a thinning or complete absence of the part of the temporal bone overlying the superior semicircular canal of the vestibular system. There is evidence that this rare defect, or susceptibility, is congenital. There are also numerous cases of symptoms arising after physical trauma to the head. Read the full Wikipedia entry. Superior canal dehiscence (SCD) can affect both hearing and balance to different extents in different people. Symptoms of SCDS include:

Tinnitus: is the perception of sound within the human ear (ringing of the ears) when no actual sound is present. Despite the origin of the name, “ringing” is only one of many sounds the person may perceive. Pulsatile tinnitus is characterized by one hearing the sounds of one’s own pulse or muscle contractions. Read the full wikipedia entry.

Tullio phenomenon: sound-induced vertigo, dizziness, nausea or eye movement (nystagmus) was first described in 1929 by the Italian biologist Prof. Pietro Tullio. (1881–1941) The cause is usually a fistula [dehiscence] in the middle or inner ear, allowing abnormal sound-synchronized pressure changes in the balance organs. Such an opening may be caused by a barotrauma (e.g. incurred when diving or flying), or may be a side effect of fenestration surgery, syphilis or Lyme disease. Patients with this disorder may also experience vertigo, imbalance and eye movement set off by changes in pressure, e.g. when nose-blowing, swallowing or when lifting heavy objects. Tullio phenomenon is also one of the common symptoms of superior canal dehiscence syndrome (SCDS). Read the full wikipedia entry.

Vertigo: is a subtype of dizziness in which a patient inappropriately experiences the perception of motion (usually a spinning motion) due to dysfunction of the vestibular system.It is often associated with nausea and vomiting as well as a balance disorder, causing difficulties standing or walking. Read the full wikipedia entry.

The vestibular system: which contributes to balance in most mammals and to the sense of spatial orientation, is the sensory system that provides the leading contribution about movement and sense of balance. Together with the cochlea, a part of the auditory system, it constitutes the labyrinth of the inner ear in most mammals, situated in the vestibulum in the inner ear. As movements consist of rotations and translations, the vestibular system comprises two components: the semicircular canal system, which indicate rotational movements; and the otoliths, which indicate linear accelerations. The vestibular system sends signals primarily to the neural structures that control eye movements, and to the muscles that keep a creature upright. Read the full wikipedia entry.

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