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Hypotonia, congenital hearing loss, and hypoactive labyrinths
John B Bodensteiner1, Shelly D Smith, G Bradley Schaefer
1Children's Health Center of St. Josephs Hospital, Barrow Neurological Institute, Phoenix, AZ 85013, USA. jbodens@chw.edu
Journal of Child Neurology
|May 7, 2003
Summary
This study identifies a rare condition in children with sensorineural hearing loss and hypotonia. Hypoactive labyrinthine function is a key feature, leading to delayed motor skills but typically resolving over time.
Area of Science:
- Neuroscience
- Genetics
- Pediatrics
Background:
- A neurosensory genetics clinic reviewed 11 years of patient records.
- 31 out of 450 patients presented with sensorineural hearing loss, hypotonia, and delayed motor milestones.
Purpose of the Study:
- To investigate the underlying causes and clinical features of a specific subset of patients with unexplained hypotonia and sensorineural hearing loss.
- To identify potential diagnostic markers and understand the natural history of this condition.
Main Methods:
- Retrospective review of patient records from a neurosensory genetics clinic.
- Clinical assessment including vestibular testing and temporal bone imaging.
- Exclusion of common etiologies like Down syndrome and cerebral palsy.
Main Results:
- Four pediatric cases were identified without a clear etiologic diagnosis.
- All four patients exhibited hypoactive labyrinthine function.
- Temporal bone imaging revealed anomalies in the cochlea, vestibule, and semicircular canals in three cases.
- Hypotonia improved over time, with no cognitive deficits observed.
Conclusions:
- Hypoactive labyrinthine function is associated with hypotonia causing delayed motor milestone acquisition.
- This condition appears to follow a benign congenital hypotonia course.
- Moderate to profound sensorineural hearing loss is a distinguishing clinical feature.