ORIGINAL COMMUNICATION

Journal of Neurology

, Volume 250, Issue 4, pp 440-443

Positional vertigo and macroscopic downbeat positioning nystagmus in spinocerebellar ataxia type 6 (SCA6)

  • Ichiro YabeAffiliated withDepartment of Neurology, Hokkaido University Graduate School of Medicine, N15 W7, Kita-ku, Sapporo 060-8638, Japan. hsasaki@med.hokudai.ac.jp
  • , Hidenao SasakiAffiliated withDepartment of Neurology, Hokkaido University Graduate School of Medicine, N15 W7, Kita-ku, Sapporo 060-8638, Japan. hsasaki@med.hokudai.ac.jp
  • , Norihito TakeichiAffiliated withDepartment of Physiology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
  • , Asako TakeiAffiliated withHokuyukai Neurology Hospital, Sapporo, Japan
  • , Takeshi HamadaAffiliated withHokuyukai Neurology Hospital, Sapporo, Japan
  • , Kikuro FukushimaAffiliated withDepartment of Physiology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
  • , Kunio TashiroAffiliated withDepartment of Neurology, Hokkaido University Graduate School of Medicine, N15 W7, Kita-ku, Sapporo 060-8638, Japan. hsasaki@med.hokudai.ac.jp

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Abstract.

To investigate the frequency of positioning nystagmus in degenerative ataxic disorders, we examined downbeat positioning nystagmus (DPN) in 25 patients with spinocerebellar ataxia type 6 (SCA6) and 58 patients with other types of degenerative ataxia. DPN was observed in 21 of the 25 patients with SCA6 (84 %) versus only 3 of the 58 patients (5.2 %) with other types of degenerative ataxia, including multiple system atrophy, SCA1, SCA2, SCA3/Machado-Joseph disease, and non-SCA6 late-onset pure cerebellar ataxia. Our findings indicated that DPN is a distinct part of the clinical presentation of SCA6, showing that vestibular cerebellum is more affected in SCA6 than other types of degenerative ataxia.

Key words spinocerebellar ataxia type 6 downbeat nystagmus positional vertigo oscillopsia vestibulo-ocular reflex