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[Problem and assignment for distinguishing the Usher syndrome type].

Satoshi Iwasaki1, Hidekane Yoshimura, Norito Takeichi

  • 1Department of Hearing Implant Sciences, Shinshu University, Matsumoto.

Nihon Jibiinkoka Gakkai Kaiho
|December 11, 2012
PubMed
Summary

Usher syndrome, a genetic disorder causing hearing loss and vision impairment, presents with varied symptoms complicating its classification. This study proposes a diagnostic flowchart to better distinguish between Usher types 1, 2, and 3.

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Area of Science:

  • Genetics
  • Ophthalmology
  • Audiology

Context:

  • Usher syndrome is an autosomal-recessive disorder characterized by sensorineural hearing loss and retinitis pigmentosa (RP).
  • Clinical differentiation of Usher syndrome types 1, 2, and 3 is based on audiovestibular features, but atypical presentations complicate diagnosis.
  • A multicenter retrospective study evaluated 26 Usher syndrome patients to clarify diagnostic challenges.

Purpose:

  • To clinically evaluate 26 patients diagnosed with Usher syndrome.
  • To assess the variations in clinical symptoms and diagnostic complexities across Usher syndrome types.
  • To propose a diagnostic flowchart for Usher types 1, 2, and 3.

Summary:

  • The study analyzed 26 patients with Usher syndrome, classifying them into type 1 (38.5%), type 2 (23.1%), and type 3 (38.5%).
  • A significant proportion of patients exhibited atypical symptoms, particularly in Usher types 1 (70%) and 2 (83.3%), complicating traditional classification.
  • Vestibular examination findings, including the caloric test, showed a low positive rate (50%), indicating variability in vestibular dysfunction.

Impact:

  • Highlights the diagnostic challenges posed by atypical Usher syndrome presentations.
  • Suggests a need for refined diagnostic criteria and proposes a flowchart to aid in classifying Usher syndrome types.
  • Emphasizes the importance of comprehensive audiovestibular and ophthalmologic evaluations for accurate Usher syndrome diagnosis and management.