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Alzheimer's Disease: Overview01:26

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Alzheimer's Disease (AD) is a continually advancing neurodegenerative disorder, distinguished by escalating memory loss, cognitive dysfunction, and dementia. The disease unfolds in three stages: preclinical, mild cognitive impairment (MCI), and dementia. Its onset is insidious, and the progression gradual, with the cause not well explained by other disorders.
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Alzheimer's Disease (AD), a neurodegenerative disorder, is pathologically identified by amyloid plaques and neurofibrillary tangles composed of tau protein. AD pharmacotherapy aims to manage cognitive symptoms, delay disease progression, and treat behavioral symptoms. The treatment is primarily symptomatic and palliative, with no definitive disease-modifying therapy available. Cholinesterase inhibitors, including donepezil (Aricept), rivastigmine (Exelon), and galantamine (Razadyne), are...
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Dementia is a collective term for cognitive disorders primarily affecting memory, thinking, and reasoning. It is not a specific disease but a syndrome, with Alzheimer's disease being the most common cause, accounting for approximately 60-80% of cases. Other types include vascular dementia, Lewy body dementia, and frontotemporal dementia. Dementia affects millions worldwide, particularly older adults, though it is not a normal part of aging.
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[Recognizing Alzheimer's disease in daily practice].

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Early Alzheimer's disease (AD) diagnosis is crucial for differentiating dementia. Identifying beta-amyloid and tau protein pathology years before symptoms aids in early detection and management of this growing neurodegenerative condition.

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Alzheimer’s diseasediagnosispathogenesis

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Area of Science:

  • Neurology
  • Neuroscience
  • Geriatrics

Background:

  • Alzheimer's disease (AD) diagnosis relies on subjective assessments, complicating differentiation from other dementias.
  • Pathogenesis involves neuropil beta-amyloid and intracellular tau protein deposition, detectable decades before clinical symptoms.
  • AD prevalence is rapidly increasing, projected to affect 115.4 million globally by 2050.

Purpose of the Study:

  • To highlight the critical need for early and accurate Alzheimer's disease diagnosis.
  • To underscore the challenges in current diagnostic criteria and their practical application.
  • To emphasize the role of biomarkers and evolving diagnostic approaches.

Main Methods:

  • Review of current diagnostic criteria for Alzheimer's disease.
  • Analysis of pathological hallmarks including beta-amyloid and tau protein.
  • Consideration of epidemiological data and risk factors such as education and intellectual activity.

Main Results:

  • Early AD diagnosis is vital but currently hampered by subjective assessments.
  • Biomarkers like beta-amyloid and tau are present 20 years prior to clinical manifestation.
  • Diagnostic criteria are dynamic, posing challenges for consistent clinical application.

Conclusions:

  • Accurate early diagnosis of Alzheimer's disease is essential for timely intervention.
  • Continued research and refinement of diagnostic tools are necessary to address the growing AD epidemic.
  • Factors like education and cognitive engagement may offer protective benefits against AD development.