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Mixed dementia: epidemiology, diagnosis, and treatment
Dina Zekry1, Jean-Jacques Hauw, Gabriel Gold
1Hôpitaux Universitaires de Genève, Thônex, Switzerland. dina.zerkry@hcuge.ch
Abstract:
Alzheimer's disease (AD) and vascular dementia (VaD) are the most frequent causes of dementia in older people. Although AD can be diagnosed with a considerable degree of accuracy, the distinction between isolated AD, VaD, and mixed dementia (MD), where both pathologies coexist in the same patient, remains a controversial issue and one of the most difficult diagnostic challenges. Although MD represents a very frequent pathology, especially in older people, as reported in neuropathological studies, the respective importance of degenerative and vascular lesions, their interaction in the genesis of dementia, and the mere existence of MD are still debated. Accurate diagnosis of MD is of crucial significance for epidemiological purposes and for preventive and therapeutic strategies. Until recently, pharmacological studies have generally focused on pure disease, AD or VaD, and have provided little information on the best therapeutic approach to MD. This article provides an overview of MD in older people. A retrospective review of the recent literature on prevalence, incidence, course, risk factors, diagnosis, and treatment of MD was performed. The article also emphasizes the need for further studies, including neuropsychological and functional evaluations, and neuroimaging and clinicopathological correlations to develop a better understanding of MD, which appears to be one of the most common forms of dementia.
Insights
Mixed dementia (MD), a common condition in older adults, involves both Alzheimer's disease and vascular dementia. Accurately diagnosing MD is crucial for effective treatment strategies and further research into this complex neurological disorder.
Area of Science:
- Neurology
- Geriatrics
- Pathology
Background:
- Alzheimer's disease (AD) and vascular dementia (VaD) are leading causes of dementia in the elderly.
- Distinguishing between isolated AD, VaD, and mixed dementia (MD) presents significant diagnostic challenges.
- MD, though common, has debated pathology, interactions, and prevalence in epidemiological studies.
Purpose of the Study:
- To provide a comprehensive overview of mixed dementia in older individuals.
- To review current literature on MD's prevalence, incidence, progression, risk factors, diagnosis, and treatment.
- To highlight the need for further research to improve understanding and management of MD.
Main Methods:
- Retrospective review of recent literature on mixed dementia.
- Analysis of studies focusing on prevalence, incidence, course, risk factors, diagnosis, and treatment.
- Emphasis on the need for integrated approaches including clinical, neuroimaging, and clinicopathological data.
Main Results:
- Mixed dementia is a frequent pathology in older populations, often underdiagnosed or misdiagnosed.
- Current research provides limited information on the specific contributions of degenerative and vascular components in MD.
- Pharmacological studies have predominantly focused on pure AD or VaD, neglecting MD-specific therapeutic strategies.
Conclusions:
- Accurate diagnosis of mixed dementia is critical for epidemiological accuracy and guiding preventive and therapeutic interventions.
- Further research integrating neuropsychological, functional, neuroimaging, and clinicopathological data is essential for a better understanding of MD.
- Mixed dementia represents a common and complex form of dementia requiring dedicated investigation and tailored management approaches.