Mixed dementia: Neglected clinical entity or nosographic artifice?

Area of Science:

• Neurology
• Geriatrics
• Pathology

Background:

• Alzheimer's disease (AD) and vascular dementia (VaD) are leading causes of dementia in the elderly.
• Mixed dementia (MxD) is often defined as the coexistence of AD and VaD.
• The precise relationship and contribution of vascular factors to AD pathology remain debated.

Purpose of the Study:

• To review the literature on the etiopathogenic overlap between AD and VaD.
• To challenge the traditional concept of MxD as a mere aggregation of distinct pathologies.
• To discuss the validity of MxD as a clinical entity in light of recent diagnostic advancements.

Main Methods:

• Narrative review of existing literature.
• Analysis of clinical and pathological data.
• Opinion paper synthesizing current understanding and controversies.

Main Results:

• The exact nature of the relationship between AD and VaD is still debated.
• Progress in understanding neurodegeneration and cerebrovascular disease is hampered by this controversy.
• The validity of MxD as a distinct clinical entity is questioned.

Conclusions:

• Recent advances in dementia classification warrant a re-evaluation of MxD.
• The traditional view of MxD as separate co-occurring diseases may be an oversimplification.
• A new perspective on MxD is needed to develop effective preventive and therapeutic strategies.