Related Experiment Videos
Olfactory dysfunction for pyridine and dementia progression in Alzheimer disease
S Nordin1, O Almkvist, B Berglund
1Department of Psychology, Stockholm University, Sweden.
Archives of Neurology
|August 1, 1997
Summary
Odor detection sensitivity for pyridine is impaired in Alzheimer disease (AD), contrary to previous beliefs. Higher odor thresholds in AD patients correlate with dementia severity and progression rate.
Area of Science:
- Neuroscience
- Olfactory Research
- Geriatric Medicine
Background:
- Previous research suggested pyridine odor detection is unaffected in Alzheimer disease (AD).
- Olfactory dysfunction is increasingly recognized as an early indicator in neurodegenerative diseases.
Purpose of the Study:
- To investigate olfactory sensitivity to pyridine in Alzheimer disease (AD).
- To determine the association between pyridine odor thresholds and dementia severity and progression in AD patients.
Main Methods:
- Determined odor thresholds for pyridine using the method of constant stimuli.
- Included 18 patients with AD and 16 healthy elderly control subjects.
- Conducted comprehensive medical and neuropsychological examinations for all participants.
Main Results:
- Six AD patients (33%) were anosmic to pyridine; non-anosmic AD patients had significantly higher thresholds (323 ppb) than controls (105 ppb).
- A significant association was found between pyridine odor threshold and both the degree of dementia and the rate of dementia progression.
Conclusions:
- Odor sensitivity to pyridine is impaired in Alzheimer disease (AD), contradicting prior findings.
- Pyridine odor sensitivity may serve as a biomarker for AD progression and aid in clinical prognostic judgments.