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Predictive tests in Huntington's disease.
Research Publications - Association for Research in Nervous and Mental Disease
|January 1, 1976
Summary
Predictive tests for Huntington's disease (HD) are reviewed, but none are currently fully reliable for early diagnosis. While offering insights into HD, these tests raise ethical concerns regarding patient well-being and disease management.
Area of Science:
- Neurology
- Genetics
- Medical Diagnostics
Background:
- Huntington's disease (HD) is an inherited neurodegenerative disorder affecting mental and motor functions.
- Current predictive methods for HD onset lack complete reliability, despite family history correlations.
- Predictive testing is crucial for identifying at-risk individuals and understanding disease mechanisms.
Purpose of the Study:
- To review and evaluate reported predictive tests for Huntington's disease.
- To emphasize the rationale behind various predictive testing methodologies.
- To discuss the ethical implications associated with predictive testing for HD.
Main Methods:
- Review of psychological testing for early cognitive and motor changes.
- Analysis of neurophysiological tests, including H-reflexes and electroencephalography (EEG).
- Examination of neuroimaging (pneumoencephalography) and metabolic markers (GABA levels, growth hormone).
- Evaluation of provocative drug challenge tests (e.g., physostigmine, L-DOPA).
Main Results:
- Psychological and neurophysiological tests show abnormalities in some patients but lack definitive predictive power.
- EEG changes are variable, and caudate atrophy on pneumoencephalography may not be an early indicator.
- Metabolic and provocative tests offer insights but are not completely reliable for predicting HD onset.
- No single predictive test or combination thereof has proven completely accurate.
Conclusions:
- Existing predictive tests for Huntington's disease provide valuable insights into the disorder's progression and effects.
- Despite their limitations, these tests are of significant neurological and ethical interest.
- None of the reviewed predictive tests are currently considered totally reliable for diagnosing HD before symptom manifestation.