When sound is inadequatly conducted through the external or middle ear to the sensorineural apparatus of the inner ear.
What is sensiorineural hearing loss?
When sound is normally carried through the external and middle ear but there is a defect within the inner ear which resultsin in sound distortions.
Causes of conductive hearing loss.
benign tumors of the middle ear
carcinoma of external auditory canal and/or middle ear
eustachian tube dysfunction
Serous OM with effusion
TB of the temporal bone
Causes of sensorineural hearing loss.
Congential or neonatal
Presbycusis/vascular changes/stiffening of basilar membrane
Many systemic diseases
Presentation of conductive hearing loss.
Sensitivity to sound diminished, clarity unchanged
Volume may be increased to compenstate(hearing normal)
Abnormal growth of bone of the middle ear
associated with slow, progressive hearing loss beinging in the second or third decade of life; TM is normal
Presentation of sensorineural hearing loss.
Noise-induced may be unilateral or bilateral
Acoustic neuroma: tinnitus and unilateral unexplained hearing loss
a lessening of hearing acuteness resulting from degenerative changes in the ear that occur especially in old age
usually 65yo or greater
pt's usually unaware
decrease in speech discrimination
hypersensitivity to noise
Acoustic neuroma is a non-cancerous tumor that
develops on the nerve that connects the ear to the brain. The tumor usually grows slowly. As it grows, it presses against the hearing and balance nerves. At first, you may have no symptoms or mild symptoms.
Loss of hearing on one side
Ringing in ears
Dizziness and balance problems
a disorder of the membranous labyrinth of the inner ear that is marked by recurrent attacks of dizziness, tinnitus, and hearing loss
When do you refer an ENT patient?
Acute hearing loss without a diagnosis or who do not improve. Refer to ENT.
Hearing loss that may benefit from a hearing device. Refer to audiologist.
For otosclerosis and congenital or acquires causes of conductive hearing loss. Refer to surgeon.