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Sudden or fluctuating hearing loss and vertigo in children due to perilymph fistula
Insights
Sudden hearing loss or disequilibrium in children may indicate a perilymph fistula. Exploratory tympanotomy is crucial for diagnosis, though surgical repair doesn't guarantee hearing recovery.
Area of Science:
- Pediatric Otolaryngology
- Neurotology
Background:
- Perilymph fistula (PLF) is a rare condition causing sensorineural hearing loss and/or disequilibrium.
- Diagnosis in children can be challenging, often requiring invasive procedures.
Observation:
- This study presents five pediatric cases of sudden sensorineural hearing loss and/or disequilibrium.
- Exploratory tympanotomy revealed perilymph fistulas in all cases.
- Contributing factors included barotrauma, physical exertion, congenital craniosynostosis, and middle ear abnormalities.
Findings:
- A proposed classification includes congenital, acquired, and combined types of PLF.
- Inner ear fluid dynamics and cochlear aqueduct patency are implicated in pathogenesis.
- History is critical for suspicion; audiometry, vestibular, and radiographic studies are supportive but not definitive.
Implications:
- Children with unexplained hearing loss or disequilibrium should be evaluated for PLF.
- Direct visualization via tympanotomy is the definitive diagnostic method.
- Surgical repair of PLF does not ensure restoration of hearing function.
Abstract:
Five cases are presented of children with rapid onset of sensorineural hearing loss, disequilibrium, or both, who were found at exploratory tympanotomy to have a perilymph fistula. Four of the children had histories suggesting that antecedent barotrauma or physical exertion contributed to the development of the fistula. One child with congenital unilateral craniosynostosis had a residual temporal bone abnormality on the same side as the perilymph fistula. Two children had identifiable anatomic abnormalities in the middle ear. A classification of perilymph fistula is proposed that describes a congenital, an acquired, and a combined type of fistula. Inner ear fluid dynamics and patency of the cochlear aqueduct appear to be important factors in pathogenesis. Children with unexplained fluctuating or sudden onset of sensorineural hearing loss, and children with unexplained disequilibrium or vertigo should be suspected of having a perilymph fistula. The history can be singularly important in raising the suspicion that a perilymph fistula may be present. Although audiometric, vestibular, and radiographic studies can be helpful, there is no way to prove the presence or absence of a fistula without directly viewing the middle ear. Tympanotomy with repair of the fistula does not assure improvement in hearing.