Cognitive decline in early Parkinson's disease
Nagaendran Kandiah1, Kaavya Narasimhalu, Puay-Ngoh Lau
1Department of Neurology, National Neuroscience Institute, 11 Jalan Tan Tock Seng, Singapore 308433, Singapore. nagaendran_kandiah@nni.com.sg
Summary
Cognitive impairment affects 31% of newly diagnosed Parkinson's disease (PD) patients. Higher education levels appear protective against cognitive decline, while depression may be a predictive factor.
Area of Science:
- Neurology
- Neuroscience
- Cognitive Science
Background:
- Limited data exists on cognitive impairment prevalence and severity in early-stage idiopathic Parkinson's disease (PD).
- Understanding early cognitive changes is crucial for patient management and prognosis.
Purpose of the Study:
- To investigate the longitudinal changes in cognitive function using the Mini-Mental State Examination (MMSE) in newly diagnosed PD patients.
- To identify baseline factors that predict cognitive decline in early idiopathic Parkinson's disease.
Main Methods:
- Prospective study of 106 newly diagnosed idiopathic Parkinson's disease patients.
- Analysis of Mini-Mental State Examination (MMSE) scores over time.
- Univariate and multivariate analyses to identify predictors of cognitive decline, including education, age, depression, and diabetes mellitus.
Main Results:
- 31% of patients exhibited measurable cognitive decline early in the disease.
- MMSE scores increased annually in patients without cognitive decline but decreased significantly in those with decline.
- Higher education was a significant protective factor (HR = 0.91, P = 0.047), and depression showed borderline significance (HR = 2.00, P = 0.061).
- Motor scores and hallucinations were not associated with cognitive decline.
Conclusions:
- Cognitive impairment is prevalent in early idiopathic Parkinson's disease.
- Higher educational attainment may offer protection against cognitive decline in PD.
- Depression warrants further investigation as a potential predictor of cognitive decline in Parkinson's disease.
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