Alzheimer's Disease Including Focal Presentations.

Area of Science:

• Neurodegenerative diseases
• Dementia research
• Neurology

Background:

• Alzheimer's disease (AD) is the most prevalent neurodegenerative disorder and cause of dementia, impacting 30 million worldwide.
• Current diagnostic criteria emphasize amyloid and tau biomarkers (PET, CSF), often independent of clinical presentation.
• Epidemiological studies identify apolipoprotein E4 (ApoE4) and advanced age as primary risk factors for AD.

Purpose of the Study:

• To review the current understanding of Alzheimer's disease, including diagnostic criteria, risk factors, clinical phenotypes, and differential diagnoses.
• To highlight the challenges in clinical practice due to the common co-occurrence of AD pathology with other neurodegenerative and vascular conditions.

Main Methods:

• Review of current research criteria for Alzheimer's disease focusing on biomarkers.
• Analysis of epidemiological data on risk factors like ApoE4 and age.
• Compilation of clinical phenotypes and differential diagnoses for AD.

Main Results:

• Alzheimer's disease diagnosis increasingly relies on amyloid and tau biomarkers.
• Apolipoprotein E4 (ApoE4) and age are significant risk factors for Alzheimer's disease.
• Clinical presentations of AD vary, with amnestic (memory loss) being most common, but rarer phenotypes exist.

Conclusions:

• Alzheimer's disease diagnosis requires integrating biomarker data with clinical presentation.
• Differential diagnosis is complex due to overlapping symptoms with other neurodegenerative diseases and non-degenerative conditions.
• The frequent co-occurrence of AD pathology with other diseases complicates diagnosis and management, necessitating improved biomarkers.