title: Quantitative assessment of cerebral blood flow in genetically confirmed spinocerebellar ataxia type 6.
abstract: BACKGROUND
  Spinocerebellar ataxia type 6 (SCA6) is an autosomal dominant cerebellar ataxia caused by CAG trinucleotide expansion. The characteristics of regional cerebral blood flow (rCBF) in SCA6 patients have not been established, whereas it has been reported that decreased rCBF in the cerebrum seems to be a remote effect of cerebellar impairment in other cerebellar disorders.
  
  
  OBJECTIVE
  To clarify the characteristics of rCBF, including cerebro-cerebellar relationship, and its correlation with clinical manifestations in patients with genetically confirmed SCA6 using quantitative assessment of rCBF by brain single-photon emission computed tomography (SPECT).
  
  
  METHODS
  Technetium Tc 99m ethyl cysteinate dimer SPECT study using a Patlak plot. Patients Hiroshima University Hospital, Hiroshima, Japan. Ten patients with SCA6 and 9 healthy controls. Main Outcome Measure The rCBF of the cerebellar vermis, cerebellar hemisphere, and frontal lobes.
  
  
  RESULTS
  In SCA6 patients, rCBF was decreased only in the cerebellar vermis and hemisphere compared with healthy controls, and this was inversely correlated with duration of illness. The rCBF in the frontal lobes was slightly correlated with duration of illness without statistical significance. The rCBF in the vermis was inversely correlated with severity of dysarthria, but there was no significant correlation with CAG repeated expansions.
  
  
  CONCLUSIONS
  Decrease in rCBF was found only in the cerebellum and was associated with duration of illness, dysarthria and ataxia, and cerebellar atrophy. No remote effect of cerebellar hypoperfusion was found in the SCA6 patients.
authors.affiliation: Department of Clinical Neuroscience and Therapeutics, Hiroshima University, Graduate School of Biomedical Sciences, Hiroshima, Japan.
authors.forename: Kie
authors.initials: K
authors.lastname: Honjo
authors.forename: Tomohiko
authors.initials: T
authors.lastname: Ohshita
authors.forename: Hideshi
authors.initials: H
authors.lastname: Kawakami
authors.forename: Hiromitsu
authors.initials: H
authors.lastname: Naka
authors.forename: Yukari
authors.initials: Y
authors.lastname: Imon
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Maruyama
authors.forename: Yasuyo
authors.initials: Y
authors.lastname: Mimori
authors.forename: Masayasu
authors.initials: M
authors.lastname: Matsumoto
mesh_terms: D000328:Adult; D000368:Aged; D002531:Cerebellum / Q000098:blood supply* / Q000473:pathology*; D002560:Cerebrovascular Circulation / Q000502:physiology; D005260:Female; D005625:Frontal Lobe / Q000098:blood supply* / Q000473:pathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D020754:Spinocerebellar Ataxias / Q000235:genetics / Q000473:pathology*; D018709:Statistics, Nonparametric; D015899:Tomography, Emission-Computed, Single-Photon / Q000379:methods