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The occurrence of the Tullio phenomenon in congenitally deaf children
Insights
The Tullio phenomenon, characterized by sound-induced nystagmus, was investigated in 150 deaf children. A functioning labyrinth was necessary for this reflex, suggesting a link to Mondini-Alexander disease in affected ears.
Area of Science:
- Otolaryngology
- Neuroscience
- Pediatrics
Background:
- The Tullio phenomenon is a vestibular response to sound.
- Deafness can stem from various inner ear pathologies.
- Understanding reflexes in deaf children aids in diagnosing underlying conditions.
Purpose of the Study:
- To investigate the prevalence of the Tullio phenomenon in deaf children.
- To determine the relationship between the Tullio phenomenon and inner ear function.
- To explore the potential link between the Tullio phenomenon and specific types of labyrinthine pathology.
Main Methods:
- A cohort of 150 deaf children (ages 5-16) from the 'Rudolf Mees' Institute were examined.
- Nystagmus was used as the criterion for detecting the Tullio phenomenon.
- Caloric testing was performed to assess the function of the pars superior of the labyrinth.
Main Results:
- The Tullio phenomenon was identified in 76 out of 300 ears investigated.
- A functioning and calorically excitable pars superior of the labyrinth was a prerequisite for the reflex.
- Deaf ears exhibiting the Tullio phenomenon were presumed to have Mondini-Alexander type labyrinthine pathology.
Conclusions:
- The Tullio phenomenon is present in a significant proportion of deaf children.
- Inner ear vestibular function, specifically the pars superior, is essential for the Tullio phenomenon.
- The presence of the Tullio phenomenon in deaf ears is indicative of pathological conditions, likely Mondini-Alexander disease.
Abstract:
One hundred and fifty deaf children between 5 and 16 years old of the 'Rudolf Mees' Institute were investigated in search of the Tullio phenomenon with nystagmus as a criterion. Seventy-six out of those 300 ears were positive. A functioning (calorically excitable) pars superior of the labyrinth was a 'conditio sine qua non' for this reflex. We may assume that deaf ears which show a positive Tullio phenomenon have a labyrinthine pathology of the Mondini-Alexander type and that this symptom is a pathologic one.