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Olfactory deficits in Alzheimer's disease
1Department of Psychiatry, New York University School of Medicine.
Journal of Neural Transmission. Supplementum
|January 1, 1987
Summary
Olfactory dysfunction is common in Alzheimer's disease (AD), but its diagnostic value for dementia is limited. Aging effects on smell require careful cognitive assessment for accurate evaluation.
Area of Science:
- Neuroscience
- Gerontology
- Neurology
Background:
- Altered olfactory function is increasingly recognized in Alzheimer's disease (AD).
- Studies report hyposmia (reduced sense of smell) in AD patients.
- Olfactory testing may have limitations in differentiating dementia types.
Purpose of the Study:
- To review neuroanatomical and neurochemical links between AD and olfaction.
- To discuss the impact of aging on olfactory performance.
- To assess the clinical utility of olfactory testing in dementia diagnosis.
Main Methods:
- Review of existing neuroanatomical and neurochemical studies.
- Analysis of olfactory recognition performance in AD and other dementias.
- Discussion of aging effects on olfactory function.
Main Results:
- Evidence suggests impaired olfactory recognition in AD.
- Some studies show better olfactory performance in non-AD dementias, questioning diagnostic utility.
- Aging significantly impacts olfactory performance.
Conclusions:
- Olfactory testing alone may not be sufficient for differential dementia diagnosis.
- Accurate assessment of aging's effects on olfaction necessitates controlling for cognitive status.
- Further research is needed to clarify the role of olfaction in AD and aging.