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Cognition is only minimally impaired in Spinocerebellar ataxia type 14 (SCA14): a neuropsychological study of ten Norwegian subjects compared to intrafamilial controls and population norm.

Wedding IM, Koht J, Dietrichs E, Landrø NI, Tallaksen CM - BMC Neurol (2013)

Bottom Line: No significant cognitive deficit was found in SCA14 subjects compared to intrafamilial controls.Verbal IQ, verbal executive function and psychomotor speed tended to be reduced in affected subjects, but previously reported non-verbal executive dysfunction was not confirmed in this study.Genotypic differences may partly account for this discrepancy, and further studies on larger materials are needed to verify the findings.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Neurology, Oslo University Hospital, Ullevål, Oslo, Norway. i.m.wedding@medisin.uio.no.

ABSTRACT

Background: There is an increasing awareness of the role of the cerebellum not only in motor, but also in cognitive and emotional functions. Spinocerebellar ataxia type 14 (SCA14) is an autosomal dominant hereditary ataxia characterized by a relatively pure cerebellar phenotype. Cognitive impairment has been reported in studies with phenotype descriptions of SCA14, but previous studies have been small without control groups, and no homogeneous and systematic test panel has been used. The objective of this study was to thoroughly characterize the neuropsychological profile in ten Norwegian SCA14 subjects compared to unaffected family members and population norm data.

Methods: Ten SCA14 subjects and ten intrafamilial unaffected age- and education-matched controls from two Norwegian families were included. The unaffected intrafamilial controls included six first degree relatives, two second degree relatives, and two spouses. General intellectual ability, memory, visuoperceptive skills, psychomotor speed, executive functions, depression and anxiety were examined using internationally standardized tests, with minimal need for manual response to avoid motor bias.

Results: No significant cognitive deficit was found in SCA14 subjects compared to intrafamilial controls. Verbal IQ, verbal executive function and psychomotor speed tended to be reduced in affected subjects, but previously reported non-verbal executive dysfunction was not confirmed in this study.

Conclusion: Only subtle cognitive impairment was found in SCA14 affected subjects. The current findings do not confirm earlier reports of cognitive dysfunction in SCA14, but does shows a mild impairment in specific verbal executive functions. Genotypic differences may partly account for this discrepancy, and further studies on larger materials are needed to verify the findings.

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MRI from four SCA14 subjects at time of neuropsychological testing. A: Subject VI-2, disease duration 7 years; B: Subject VI-3, disease duration 10 years; C: Subject III-3, disease duration 18 years; D: Subject V-3, disease duration 25 years.
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Figure 2: MRI from four SCA14 subjects at time of neuropsychological testing. A: Subject VI-2, disease duration 7 years; B: Subject VI-3, disease duration 10 years; C: Subject III-3, disease duration 18 years; D: Subject V-3, disease duration 25 years.

Mentions: MRI was performed in eight subjects and showed isolated cerebellar atrophy in all, except in one subject where also unspecific white matter hyperintensities were described. In five of the eight subjects, atrophy was clearly most prominent in the vermis (Figure 2).


Cognition is only minimally impaired in Spinocerebellar ataxia type 14 (SCA14): a neuropsychological study of ten Norwegian subjects compared to intrafamilial controls and population norm.

Wedding IM, Koht J, Dietrichs E, Landrø NI, Tallaksen CM - BMC Neurol (2013)

MRI from four SCA14 subjects at time of neuropsychological testing. A: Subject VI-2, disease duration 7 years; B: Subject VI-3, disease duration 10 years; C: Subject III-3, disease duration 18 years; D: Subject V-3, disease duration 25 years.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4219450&req=5

Figure 2: MRI from four SCA14 subjects at time of neuropsychological testing. A: Subject VI-2, disease duration 7 years; B: Subject VI-3, disease duration 10 years; C: Subject III-3, disease duration 18 years; D: Subject V-3, disease duration 25 years.
Mentions: MRI was performed in eight subjects and showed isolated cerebellar atrophy in all, except in one subject where also unspecific white matter hyperintensities were described. In five of the eight subjects, atrophy was clearly most prominent in the vermis (Figure 2).

Bottom Line: No significant cognitive deficit was found in SCA14 subjects compared to intrafamilial controls.Verbal IQ, verbal executive function and psychomotor speed tended to be reduced in affected subjects, but previously reported non-verbal executive dysfunction was not confirmed in this study.Genotypic differences may partly account for this discrepancy, and further studies on larger materials are needed to verify the findings.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Neurology, Oslo University Hospital, Ullevål, Oslo, Norway. i.m.wedding@medisin.uio.no.

ABSTRACT

Background: There is an increasing awareness of the role of the cerebellum not only in motor, but also in cognitive and emotional functions. Spinocerebellar ataxia type 14 (SCA14) is an autosomal dominant hereditary ataxia characterized by a relatively pure cerebellar phenotype. Cognitive impairment has been reported in studies with phenotype descriptions of SCA14, but previous studies have been small without control groups, and no homogeneous and systematic test panel has been used. The objective of this study was to thoroughly characterize the neuropsychological profile in ten Norwegian SCA14 subjects compared to unaffected family members and population norm data.

Methods: Ten SCA14 subjects and ten intrafamilial unaffected age- and education-matched controls from two Norwegian families were included. The unaffected intrafamilial controls included six first degree relatives, two second degree relatives, and two spouses. General intellectual ability, memory, visuoperceptive skills, psychomotor speed, executive functions, depression and anxiety were examined using internationally standardized tests, with minimal need for manual response to avoid motor bias.

Results: No significant cognitive deficit was found in SCA14 subjects compared to intrafamilial controls. Verbal IQ, verbal executive function and psychomotor speed tended to be reduced in affected subjects, but previously reported non-verbal executive dysfunction was not confirmed in this study.

Conclusion: Only subtle cognitive impairment was found in SCA14 affected subjects. The current findings do not confirm earlier reports of cognitive dysfunction in SCA14, but does shows a mild impairment in specific verbal executive functions. Genotypic differences may partly account for this discrepancy, and further studies on larger materials are needed to verify the findings.

Show MeSH
Related in: MedlinePlus