Alzheimer's is the most common dementia, but it's far from the only one. Understanding the specific type of dementia your client has changes how you provide care. A client with Lewy body dementia has hallucinations that require a very different response than a client with frontotemporal dementia who is socially inappropriate. This lesson gives you the knowledge to adapt.

Section 01

Vascular Dementia

Vascular dementia is the second most common type, caused by reduced blood flow to the brain — usually from strokes or small vessel disease.

  • Cause: Stroke, mini-strokes (TIAs), or chronic damage to small blood vessels supplying the brain.
  • Onset pattern: Often sudden or stepwise — the client may decline sharply after a stroke, plateau, then decline again with the next event.
  • Key symptoms: Slowed thinking, difficulty with planning and organizing, problems with attention and concentration. Memory may be less affected than in Alzheimer's, especially early on.
  • Physical symptoms common: Weakness on one side, balance problems, and movement difficulties often accompany cognitive decline.
  • Care implication: Managing cardiovascular risk factors (blood pressure, diabetes, cholesterol) can help slow progression. Watch carefully for signs of new stroke.
Section 02

Lewy Body Dementia

Lewy body dementia (LBD) is the third most common type and among the most complex to manage. It involves abnormal protein deposits (Lewy bodies) in brain cells.

⚠ Critical care alert: antipsychotic medications
People with Lewy body dementia can have severe — sometimes fatal — reactions to antipsychotic medications commonly used to manage hallucinations and agitation in other dementias. Always report any psychiatric medication changes to the supervising nurse and flag any history of LBD on the care plan.
  • Visual hallucinations: Often vivid and detailed — people, children, animals. Unlike in Alzheimer's, these can occur early in the disease and are a defining feature.
  • Fluctuating cognition: The client may be lucid and conversational one hour, severely confused the next. This variation is not behavioral — it's the disease.
  • Parkinson's-like motor symptoms: Stiffness, shuffling gait, tremor, and increased fall risk — often develop alongside cognitive symptoms.
  • REM sleep behavior disorder: Acting out dreams — sometimes violently — during sleep. Clients may have a history of this years before diagnosis.
  • Autonomic dysfunction: Blood pressure fluctuations, constipation, urinary incontinence, and dizziness when standing (orthostatic hypotension).
Section 03

Frontotemporal Dementia (FTD)

FTD damages the frontal and temporal lobes — the regions controlling personality, behavior, social conduct, and language. It typically affects people younger than other dementias, often in their 50s and 60s.

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Behavioral variant FTD

Dramatic personality changes: loss of empathy, social inappropriateness, impulsive behavior, disinhibition. The client may say offensive things, disregard social norms, or behave sexually inappropriately. This is the disease — not the person.

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Primary progressive aphasia

Language deteriorates first — difficulty finding words, speaking, reading, or writing — while memory and behavior may remain intact for years. Communication strategies are central to care.

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Care implication

FTD clients are often younger, physically strong, and may have intact memory but severely impaired judgment. Safety supervision is critical. Families often struggle with the personality change more than any other symptom.

Section 04

Mixed Dementia

Many people — particularly those over 80 — have mixed dementia: more than one type of dementia occurring simultaneously, most commonly Alzheimer's combined with vascular dementia.

💡 Mixed dementia in practice
Because mixed dementia combines features of multiple types, symptom presentation can be complex and unpredictable. Focus on the individual client's actual symptoms and needs rather than expecting a textbook pattern. A thorough care plan review with the supervising nurse is especially important.
Section 05

Quick Reference: Dementia Types at a Glance

Key distinguishing features

  • Alzheimer's: memory loss first, gradual onset
  • Vascular: stepwise decline, after stroke/TIA
  • Lewy body: hallucinations + fluctuating cognition
  • FTD: personality/behavior change, younger onset
  • Mixed: features of multiple types combined

Critical care alerts

  • LBD: dangerous reaction to antipsychotics
  • Vascular: watch for stroke signs
  • FTD: strong body + poor judgment = safety risk
  • LBD: high fall risk from motor symptoms
  • All types: sudden change = call nurse or 911
Knowledge Check

Lesson 3 Quiz

5 questions · Passing score: 80%
Question 1
A client's family tells you he was sharp until suffering a major stroke six months ago, after which he became significantly confused. His thinking has been stable since, but they worry about another decline. This pattern most suggests:
Question 2
A client with Lewy body dementia is agitated and her doctor asks if antipsychotic medication might help. As her caregiver, you should know:
Question 3
A 58-year-old client with frontotemporal dementia makes sexual comments to you that are very out of character based on what his family has described. You should understand this as:
Question 4
Which dementia type is characterized by vivid visual hallucinations and dramatic fluctuations in alertness — clear one hour, severely confused the next?
Question 5
A client with vascular dementia lives with poorly controlled high blood pressure and diabetes. From a dementia care perspective, managing these conditions is important because: