Dural arteriovenous fistula is a out of the ordinary connections between the dura meter (touch covering over the brain) and artery.
Usher’s syndrome has no cure, only treatment. Syndromic Form of Hearing loss that is inherited genetically. Retinitis pigmentosa is present. Type 1 have a hearing loss at birth, accompanied with imbalance. Vision lost is progressive through childhood.
Otorrhea relates to ear drainage due to a ruptured ear drum. Ear infection and trauma are present. Fluid drifts into the ear canal.
Examination of the entire auditory system is important, when evaluating the difference between sensory (cochlea) and neural (retro-cochlear) hearing loss.
During pure tone audiometry, fixation in the footplate of the stapes causes a conductive hearing loss with a large stiffness component, producing threshold elevations in lower frequencies.
Type C tympanogram graphic representation shows the point of maximal compliance occurs with negative pressure in the ear canal. Eustachian tube obstruction. Curved line is small and never reaches the top.
Computer averaging and scalp surface electrodes is a useful tool when examining brainstem auditory evoked responses.
Membranes are ruptured and the perilymph fluid flows from the inner ear towards the outer ear. This is perilymphatic fistula.
Symptoms of a patient with unilateral deafness include abnormal/difficulty with sound localization. Reduced clarity of hearing in background noise.
Bilateral cochlear implants benefit children. Children perform better in background noise. Better in sound localization. Less fatigued by the work, compared to monaural hearing.
