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Ideomotor limb apraxia in Huntington's disease: a case-control study
Anna K Hödl1, Elfriede Hödl, Daniela V Otti
1University Clinic of Psychiatry, Graz Medical University, Auenbruggerplatz 31, 8036, Graz, Austria.
Journal of Neurology
|February 29, 2008
Summary
Ideomotor limb apraxia is common in Huntington
Area of Science:
- Neuroscience
- Neurology
- Clinical Psychology
Background:
- Ideomotor limb apraxia involves difficulties in planning and executing movements, not due to motor or sensory nerve issues.
- Apraxia is a key diagnostic feature in Alzheimer's disease and can also appear in dementias with subcortical lesions, such as Huntington's disease (HD).
- Huntington's disease is a hereditary neurodegenerative disorder causing significant neurological and psychiatric impairments.
Purpose of the Study:
- To investigate the relationship between ideomotor limb apraxia and neuropsychological deficits in patients with Huntington's disease.
- To determine the prevalence of apraxia in Huntington's disease.
- To assess if apraxia correlates with the severity of neurological symptoms and cognitive decline in HD.
Main Methods:
- Evaluated 41 Huntington's disease patients and 33 matched controls using the De Renzi test and a specialized apraxia test battery.
- Assessed neuropsychological function via the Mini Mental State Examination (MMSE), Rey Complex Figure Memory Test, Trail Making Test A and B, California Verbal Learning Test, Stroop Color and Word Test, Controlled Oral Word Association Test, and Mehrfachwahl-Wortschatz-Intelligenztest.
- Measured motor function in HD patients using the Unified Huntington's Disease Rating Scale (UHDRS).
Main Results:
- Apraxia was prevalent in Huntington's disease, particularly in pantomime of tool use (67.9%) and meaningful gestures on demand (39.3%).
- HD patients performed significantly worse than controls across most tests, including apraxia assessments and all neuropsychological tests except verbal intelligence.
- Apraxic HD patients exhibited poorer performance in Rey Complex Figure Memory Test subitems (Organization, short-term/long-term memory) and worse UHDRS motor and oculomotor scores compared to non-apraxic HD patients.
Conclusions:
- Ideomotor limb apraxia is a frequent clinical sign in Huntington's disease.
- The study, the largest of its kind in HD, found that apraxia occurrence is independent of overall neuropsychological decline.
- Apraxia in HD appears unrelated to the severity of most neurological symptoms, challenging previous assumptions.
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