Later onset of conductive hearing loss may have an obvious cause such as an ear infection, trauma or upper respiratory tract infection or may have an insidious onset related to chronic middle ear disease, otosclerosis or a tumour of the naso-pharynx. Conductive hearing loss developing during childhood is usually due to otitis media with effusion and may present with speech and language delay or difficulty hearing. The hearing loss is usually worse in lower frequencies.Ĭongenital conductive hearing loss is identified through newborn hearing screening or may be identified because the baby has microtia or other facial abnormalities. Superior canal dehiscence – which may require surgical correction.Ĭonductive hearing loss makes all sounds seem faint or muffled.More severe barotrauma can lead to middle ear fluid or even permanent sensorineural hearing loss. It is managed by any of various methods of ear clearing manoeuvres to equalize the pressures, like swallowing, yawning, or the Valsalva manoeuvre. This can temporarily occur, for example, by the environmental pressure changes as when shifting altitude, or inside a train going into a tunnel. Barotrauma, unequal air pressures in the external and middle ear.This can be an isolated phenomenon or can occur as part of a syndrome where development of the 1st and 2nd branchial arches is seen such as in Goldenhar syndrome, Treacher Collins syndrome, branchio-oto-renal syndrome etc. Congenital malformation of the ossicles.Ossicular discontinuity as a consequence of infection or temporal bone trauma.Otosclerosis, abnormal growth of bone in or near the middle ear.Eustachian Tube Dysfunction, inflammation or mass within the nasal cavity, middle ear, or eustachian tube itself.Tympanosclerosis or scarring of the eardrum.Chronic suppurative otitis media (CSOM).Blocking of the eustachian tube leads to decreased pressure in the middle ear relative to the external ear, and this causes decreased motion of both the ossicles and the tympanic membrane. Major causes are ear infections or conditions that block the eustachian tube, such as allergies or tumors. Acquired stenosis (narrowing) of the external auditory canal following surgery or radiotherapyįluid accumulation is the most common cause of conductive hearing loss in the middle ear, especially in children.Ear canal stenosis & atresia can exist independently or may result from congenital malformations of the auricle such as microtia or anotia.Congenital stenosis or atresia of the external auditory canal (narrow or blocked ear canal).Exostoses, abnormal growth of bone within the ear canal.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |