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Dementia

Progressive Cognitive Decline Syndrome with Multiple Etiologies and Functional Impairment

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Nöroloji department. Book Appointment →

What is Dementia?

Dementia is a progressive cognitive decline syndrome interfering with daily functioning, characterized by impairment in two or more cognitive domains (memory, executive function, language, attention, visuospatial, social cognition); affects 50 million people worldwide.

Epidemiology: prevalence increases with age — 5–8% age 65, 25–30% age 85, >40% over age 90; expected to triple to 152 million by 2050; women have higher lifetime prevalence.

Pathophysiology by subtype: Alzheimer disease (60–70%, beta-amyloid plaques and tau neurofibrillary tangles), vascular dementia (15–20%, cerebrovascular disease), dementia with Lewy bodies (10–15%, alpha-synuclein), frontotemporal dementia (5–10%, tau or TDP-43 pathology).

Mixed pathology common in elderly patients (multiple coexisting pathologies); accurate diagnosis is critical for management and prognosis.

Symptoms

Memory impairment: short-term memory loss, repetitive questions, misplacing items (Alzheimer initial symptom)
Executive dysfunction: difficulty planning, problem-solving, multi-tasking, finance management
Language difficulties: word-finding problems, vocabulary loss, comprehension difficulties (more prominent in frontotemporal dementia and primary progressive aphasia)
Visuospatial problems: getting lost in familiar places, difficulty with face recognition, judging distances
Behavior and personality changes: apathy, social withdrawal, depression, anxiety, irritability, disinhibition (frontotemporal dementia)
Visual hallucinations, fluctuating cognition, REM sleep behavior disorder (Lewy body dementia)
Parkinsonian features: rigidity, bradykinesia, gait disturbance (Lewy body dementia, vascular)
Functional impairment: difficulty with activities of daily living (IADLs first, then ADLs)
Sleep disturbance, sundowning (worsening confusion in evening)
Wandering, agitation, sleep-wake cycle disruption
Late-stage symptoms: incontinence, immobility, swallowing difficulty, recurrent infections

Risk Factors

Age >65 years (most important risk factor)
Family history of dementia (1.5–3× increased risk)
Genetic factors: APOE ε4 allele (3–12× increased Alzheimer risk), familial Alzheimer mutations (APP, PSEN1, PSEN2), C9ORF72 (FTD-ALS)
Cardiovascular disease: hypertension, diabetes, hyperlipidemia, atrial fibrillation
Cerebrovascular disease: stroke, transient ischemic attack, white matter disease
Lifestyle factors: physical inactivity, smoking, excessive alcohol, obesity, poor diet
Cognitive risk factors: lower educational attainment, social isolation, hearing loss, depression
Down syndrome (almost universal Alzheimer pathology by age 50)
Traumatic brain injury (especially repetitive)
Sleep disorders: obstructive sleep apnea, insomnia
Air pollution exposure

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • New onset memory loss progressing over months
  • Difficulty with familiar tasks (finance, cooking, driving)
  • Getting lost in familiar places
  • Word-finding difficulties or language regression
  • Personality or behavior changes
  • Functional decline at work or home
  • Family member or friend expressing concern about cognitive decline
  • Visual hallucinations, gait disturbance with cognitive symptoms (Lewy body)
  • Acute confusion (consider delirium first, then dementia evaluation)

Treatment Methods

01
Diagnostic workup: detailed history from patient and informant, comprehensive cognitive testing (MMSE, MoCA, ACE-III), functional assessment, neurological examination
02
Laboratory tests: CBC, comprehensive metabolic panel, TSH, B12, folate, syphilis (RPR), HIV in selected cases, ammonia if hepatic encephalopathy suspected
03
Brain imaging: MRI brain (atrophy patterns, white matter disease, vascular pathology, structural lesions); CT if MRI contraindicated
04
Biomarker testing (selected cases): CSF beta-amyloid 42, total tau, phospho-tau (Alzheimer biomarkers); blood-based biomarkers (p-tau217, p-tau181) emerging
05
Functional imaging: FDG-PET (metabolic patterns: temporoparietal in Alzheimer, frontotemporal in FTD), amyloid PET (florbetapir, florbetaben), tau PET (flortaucipir)
06
Genetic testing: in early-onset disease, strong family history, suspected familial dementia
07
Cholinesterase inhibitors (Alzheimer mild-moderate): donepezil 5–10 mg/day, rivastigmine (oral or transdermal patch 4.6–13.3 mg), galantamine 8–24 mg/day
08
NMDA receptor antagonist (Alzheimer moderate-severe): memantine 5–20 mg/day
09
Disease-modifying therapy (Alzheimer): lecanemab (anti-amyloid monoclonal antibody, IV every 2 weeks), donanemab (IV every 4 weeks); slow disease progression by ~30% in early Alzheimer; ARIA monitoring required
10
Vascular dementia: management of vascular risk factors (blood pressure, diabetes, lipids, antiplatelet therapy), no specific FDA-approved therapy
11
Lewy body dementia: cholinesterase inhibitors (rivastigmine particularly effective), avoid antipsychotics due to severe sensitivity, levodopa for parkinsonian features (limited use)
12
Frontotemporal dementia: no FDA-approved therapy; SSRIs for behavioral symptoms, atypical antipsychotics (cautiously) for severe agitation
13
Behavioral and psychological symptom management: non-pharmacological first (environment optimization, music therapy, exercise, social engagement); pharmacological for severe symptoms (atypical antipsychotics with caution due to mortality risk)
14
Sleep management: sleep hygiene, melatonin for circadian rhythm, treat underlying conditions; avoid benzodiazepines and z-drugs
15
Caregiver support: caregiver education, support groups, respite care, professional in-home help; depression screening for caregivers
16
Safety considerations: medication management, driving cessation, fall prevention, wandering precautions, financial protection
17
Advance care planning: power of attorney, healthcare proxy, advance directives, end-of-life preferences while patient has capacity
18
Lifestyle interventions: regular physical activity (150 min/week), Mediterranean diet, social engagement, cognitive training, sleep optimization
19
Long-term care planning: care levels (home with support, assisted living, memory care, skilled nursing), financial planning
20
Multidisciplinary follow-up: neurology, geriatrics, neuropsychology, social work, physical and occupational therapy, palliative care, primary care

Which Department to Visit?

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.