Alzheimer's Disease Nursing Guide

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Pathophysiology & Epidemiology

Alzheimer's Disease (AD) is the most common cause of dementia, accounting for 60–70% of all dementia cases. It is a progressive neurodegenerative disease characterised by:

Pathological Hallmarks

Amyloid beta (Aβ) plaques — extracellular accumulation; disrupt synaptic transmission
Neurofibrillary tau tangles — intracellular; hyperphosphorylated tau destroys microtubules
Hippocampal atrophy — first affected; explains early memory impairment
Cholinergic neuron loss → deficiency in acetylcholine
Progressive cortical atrophy on MRI brain

Risk Factors

Age — strongest risk factor; doubles every 5 years after age 65
APOE-ε4 gene — increases risk 3–4× (homozygous: 8–12×)
Down syndrome (trisomy 21) — APP gene on chromosome 21; near 100% develop AD by age 65
Family history of AD (first-degree relative)
Cardiovascular risk factors: hypertension, diabetes, obesity, smoking
Traumatic brain injury (repeated)
Lower educational attainment (reduced cognitive reserve)

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Staging of Alzheimer's Disease

Stage 1 — Mild

Mild AD

Memory lapses (recent events, names)

ADLs (activities of daily living) largely intact

Word-finding difficulties

May still drive (requires assessment)

MMSE: ≥20 / MoCA: 18–25

Stage 2 — Moderate

Moderate AD

Significant memory impairment

Impaired ADLs (dressing, cooking, finances)

BPSD common (agitation, wandering, sleep disturbance)

May not recognise close family

MMSE: 10–20

Stage 3 — Severe

Severe AD

Total dependence for all ADLs

Bedbound or wheelchair-bound

Loss of speech (mutism)

Dysphagia → aspiration risk

MMSE: <10; end-of-life planning essential

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Cognitive Assessment Tools

Tool	Max Score	Scoring	Notes
MMSE	30	≥24 = normal; 18–23 = mild; 10–17 = moderate; <10 = severe	Widely used; limited sensitivity for early/MCI
MoCA	30	≥26 = normal; <26 = cognitive impairment	More sensitive than MMSE for early MCI; tests visuospatial function
AMTS (Abbreviated Mental Test Score)	10	<7 = cognitive impairment	Quick bedside screen; used in acute settings
Clock Drawing Test	Qualitative	Abnormal = visuospatial / executive dysfunction	Useful quick screen; complements MMSE

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Clinical Assessment

Cognitive Domains to Assess

Memory (short-term and long-term)
Language (word-finding, naming, comprehension)
Visuospatial function (clock drawing, navigation)
Executive function (planning, problem-solving)
Attention and concentration

Functional Assessment

Basic ADLs: bathing, dressing, toileting, transferring, continence, feeding
Instrumental ADLs: cooking, shopping, managing finances, driving, medications
Barthel Index / Bristol ADL Scale

Key Investigations

MRI brain: hippocampal atrophy, cortical atrophy, exclude other causes (subdural, tumour, NPH)
CT brain: if MRI contraindicated
Blood tests: FBC, TFTs (hypothyroidism mimics dementia), B12/folate, U&E, LFTs, glucose, CRP (exclude reversible causes)
Urine dip (delirium excluded)
CSF: Aβ42/tau ratio — available in specialist centres; amyloid PET imaging

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Pharmacological Treatment

Drug Class	Drugs	Indication	Mechanism
Cholinesterase Inhibitors	Donepezil, Rivastigmine, Galantamine	Mild to moderate AD	Inhibit acetylcholinesterase → increase ACh availability
NMDA Antagonist	Memantine	Moderate to severe AD (also used in combination)	Blocks overactivation of NMDA glutamate receptors → neuroprotective
Anti-amyloid (New)	Lecanemab (Leqembi)	Early AD (FDA approved 2023) — disease-modifying	Monoclonal antibody — clears amyloid plaques; slows progression

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Antipsychotics in Dementia — BLACK BOX WARNING

Antipsychotics (e.g. haloperidol, risperidone, quetiapine) increase risk of stroke and death in elderly patients with dementia. Use as LAST RESORT only for severe BPSD after all non-pharmacological approaches have failed. Document clear indication and review regularly.

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BPSD — Behavioural & Psychological Symptoms of Dementia

BPSD includes agitation, aggression, wandering, sleep disturbance, depression, anxiety, hallucinations, and psychosis. Non-pharmacological approaches are always first-line.

Non-Pharmacological (First-Line)

Structured daily routine — reduces confusion and agitation
Music therapy — familiar music reduces agitation
Reminiscence therapy — photo albums, familiar objects
Light therapy — for sleep disturbance / sundowning
Person-centred communication — calm, clear, simple language
Environment: reduce noise, adequate lighting, familiar surroundings
Dementia-friendly ward design

Pharmacological (Last Resort)

Antipsychotics: risperidone (licensed for short-term use in AD), quetiapine (less extrapyramidal side effects)
Antidepressants: sertraline or citalopram for depression/anxiety (avoid TCAs)
Melatonin / low-dose benzodiazepines: for severe sleep disturbance (short-term)
Always: review and document indication; regular review for discontinuation

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Safety Considerations

Wandering & Elopement Risk

GPS tracker (wristband/watch style)
Door alarms and coded door locks
Wander guard sensor bracelets in hospital
Safe Return identification bracelet
Consistent environmental cues

Other Safety Risks

Driving: Assess fitness to drive; must notify licensing authority (equivalent DVLA) when diagnosis confirmed in moderate stage
Cooking: Risk of leaving hob/cooker on → fire hazard; consider automatic shut-off
Falls: Gait disturbance, sedating medications; falls prevention protocol
Medication: Blister packs, dosette boxes; carer supervision for compliance
Financial abuse: Capacity to manage finances — involve family/legal guardian

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Carer Support & Advance Care Planning

Carer burnout — screen carers at every review using carer burden scales (Zarit Burden Interview)
Respite care — day centres, short-term residential care, in-home support
Support groups — Alzheimer's Society (international chapters), local Arabic-language groups
Advance care planning (ACP) — complete while patient has mental capacity (mild stage): lasting power of attorney (LPA), advance decision to refuse treatment (ADRT), preferred place of death
Capacity assessment — regular review; document each assessment (Mental Capacity Act principles)

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Complications & Nursing Priorities

Physical Complications

Aspiration pneumonia — major cause of death in severe AD; dysphagia assessment (SLT) essential
Pressure ulcers — immobility; repositioning, pressure-relieving mattress
Malnutrition and dehydration — monitor weight, food charts
Falls and fractures — especially hip fracture (significant mortality)
UTIs — dehydration + incontinence; treat promptly (can cause acute delirium)
Constipation — immobility, low fibre, anticholinergics

Neuropsychiatric Complications

Delirium superimposed on dementia — important to distinguish; look for acute change
Depression (comorbid) — common in early AD; treat actively
Anxiety and catastrophic reactions
Hallucinations (more visual than auditory)
Aggression/agitation — assess for underlying cause (pain, infection, constipation)

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GCC-Specific Context

Stigma & Sensitive Disclosure ▼

In many GCC families, dementia is associated with shame, family honour concerns, and spiritual attribution (interpreted as divine will). This can delay presentation and diagnosis.

Nurses should use culturally sensitive language — avoid the word "dementia" initially if distressing
Frame diagnosis in terms of brain disease, not mental illness or weakness
Arabic-speaking nurses or trained interpreters essential for accurate history and disclosure
Family-centred disclosure model preferred in GCC — discuss with family together, respecting patient dignity

Islamic Bioethics & Family Decision-Making ▼

In GCC countries, Islamic bioethical principles govern medical decision-making when a patient loses mental capacity. Family decision-making is central, guided by the principle of the patient's best interests (maslaha).

Advance care planning within Islamic framework: scholar consultation for complex decisions
Guardianship laws vary: Saudi Arabia, UAE, Qatar have different legal frameworks for healthcare proxies
Artificial nutrition (PEG feeding) in severe dementia — contentious; Islamic scholars generally support natural means; family guidance essential
Nurses must document discussions with family and any proxy decision-makers

Family-Based Care & Carer Burden in GCC ▼

Unlike Western countries where institutional care is common, GCC families typically care for elderly relatives at home. This is deeply embedded in Islamic and tribal cultural values. However, this creates significant carer burden — often falling on female family members.

Formal dementia care homes are limited in GCC — increasing need
Domestic helpers (common in GCC households) may be primary caregivers without dementia training
Nursing role: provide carer education, respite signposting, and regular carer burden assessment

Rising Dementia Burden in GCC ▼

Ageing GCC nationals + longer life expectancy = rapidly growing dementia burden
High vascular risk factor burden (diabetes, hypertension) → vascular dementia and mixed dementia increasing
GCC national dementia strategies: UAE National Dementia Strategy, Saudi Arabia increasing memory clinic provision
Nurses in memory clinics, geriatrics, and long-term care settings central to dementia care delivery

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High-Yield Exam Facts

AD = most common dementia = 60–70% of all dementia
Pathology: amyloid plaques + tau tangles; hippocampus first affected
Strongest risk factor = age
Genetic risk: APOE-ε4; Down syndrome (chromosome 21 — APP gene)
MMSE: 30 = normal; ≥24 = normal; 10–20 = moderate; <10 = severe
MoCA = more sensitive than MMSE for early/MCI
Mild–moderate AD: cholinesterase inhibitors (donepezil, rivastigmine, galantamine)
Moderate–severe AD: add memantine (NMDA antagonist)
BPSD: non-pharmacological FIRST (routine, music therapy, reminiscence)
Antipsychotics in dementia = BLACK BOX WARNING — last resort; stroke/death risk
Wandering safety: GPS tracker, door alarms
Advance care planning: complete while patient still has capacity
Lecanemab = new anti-amyloid disease-modifying therapy (FDA 2023)

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Practice MCQs

Question 1 of 4

A 72-year-old patient with Alzheimer's disease becomes increasingly agitated in the evenings, pacing, shouting, and resisting personal care. What is the most appropriate first-line intervention?

A. Prescribe haloperidol 1.5mg nocte immediately

B. Implement non-pharmacological strategies including structured routine, reduced evening stimulation, and music therapy

C. Initiate lorazepam PRN for agitation episodes

D. Transfer to a secure psychiatric unit

Correct answer: B — Non-pharmacological interventions are always first-line for BPSD. Structured routines, dimming lights in the evening, familiar music, and a calm environment reduce sundowning agitation. Antipsychotics carry a BLACK BOX WARNING for increased stroke and death risk in elderly dementia patients and should only be used as a last resort after all non-pharmacological approaches have failed.

Question 2 of 4

A nurse performs a cognitive assessment using the MMSE. The patient scores 14/30. How would this be classified?

A. Normal cognitive function

B. Mild cognitive impairment

C. Moderate Alzheimer's disease

D. Severe Alzheimer's disease

Correct answer: C — MMSE scoring: ≥24 = normal cognition; 18–23 = mild impairment; 10–17 = moderate dementia; <10 = severe dementia. A score of 14 falls in the moderate range (10–17). MoCA is more sensitive for early/mild cognitive impairment.

Question 3 of 4

Which drug class is indicated for moderate-to-severe Alzheimer's disease and works by blocking NMDA glutamate receptors?

A. Cholinesterase inhibitors (donepezil, rivastigmine)

B. SSRIs (sertraline, citalopram)

C. Memantine (NMDA receptor antagonist)

D. Beta-blockers (propranolol)

Correct answer: C — Memantine is an NMDA glutamate receptor antagonist indicated for moderate-to-severe Alzheimer's disease. It blocks excessive glutamate activity which contributes to neuronal damage. Cholinesterase inhibitors (donepezil, rivastigmine, galantamine) are used for mild-to-moderate AD and work by increasing acetylcholine.

Question 4 of 4

A patient with early Alzheimer's disease still has mental capacity. When is the most appropriate time to initiate advance care planning (ACP)?

A. When the patient reaches the severe stage and is bedbound

B. As early as possible while the patient still has mental capacity

C. ACP is only for cancer patients, not dementia

D. After family members have agreed among themselves

Correct answer: B — Advance care planning should be initiated as early as possible while the patient retains mental capacity. This enables the patient to express wishes about future treatment, appoint a legal proxy (power of attorney), and document advance decisions to refuse treatment. Waiting until capacity is lost removes the patient's voice from these crucial decisions.