Early Stage: Subtle Indicators
In the initial phase of Alzheimer's disease, cognitive deficits are mild and often mistakenly attributed to normal aging:
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Short-Term Memory Lapses: Repetitive questioning within short intervals and forgetting recent conversations (while long-term memories remain intact).
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Visuospatial and Temporal Disorientation: Hesitation in familiar environments or confusion regarding dates and seasons.
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Executive Function Decline: Struggles with managing finances, paying bills, or completing multi-step daily tasks.
Middle Stage: Disease Progression and Functional Decline
Damage spreads from the hippocampus to broader cortical networks:
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Prosopagnosia & Recognition Deficits: Difficulty identifying familiar acquaintances or extended family members.
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Loss of Instrumental Activities of Daily Living (IADLs): Challenges in selecting weather-appropriate attire, maintaining hygiene, or preparing meals independently.
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Behavioral Shifts: Mood lability, unprovoked paranoia, anxiety, or late-afternoon agitation (sundowning).
Late Stage: Advanced Dependence
Severe cortical atrophy leads to loss of verbal communication, motor coordination, and complete dependence on round-the-clock care.
Scientific References:
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Alzheimer's Association. (2023). 2023 Alzheimer's disease facts and figures. Alzheimer's & Dementia, 19(4), 1598-1695.
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McKhann, G. M., et al. (2011). The diagnosis of dementia due to Alzheimer's disease. Alzheimer's & Dementia, 7(3), 263-269.
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