Assessment and Care of Older Adults with Neurological Conditions

Introduction

This study guide covers the normal cognitive changes associated with ageing, the relevance of mild cognitive impairment, and the differentiation between dementia, delirium, and depression in older adults. It also outlines principles for assessment and care of older people with neurological conditions, focusing on neurocognitive function.

Definitions

Cognition

• Cognition: The action or process of acquiring knowledge and understanding through thought, experience, and the senses.

• Cognitive Function: Refers to or involves conscious intellectual activity, such as thinking, reasoning, and remembering.

Normal Age-Related Cognitive Changes

Structural Changes in the Brain

Ageing is associated with changes in both brain structure and function, particularly in the gray matter and white matter regions of the brain.

• Gray Matter: Contains most of the brain's neuronal cell bodies and is involved in muscle control, sensory perception, memory, emotions, and decision-making.

• White Matter: Composed of myelinated nerve fibers and is responsible for communication between different brain regions.

• Age-related changes may include reduced volume and integrity of both gray and white matter, affecting cognitive abilities.

Types of Intelligence

• Crystallised Intelligence: Knowledge, skills, and experience (e.g., vocabulary, general knowledge). This type of intelligence remains relatively stable or grows into the 6th and 7th decades of life.

• Fluid Intelligence: The ability to reason, solve problems, and learn new information. Fluid intelligence tends to decline with age.

• Processing Speed: The speed at which cognitive tasks are performed and motor responses are made. Processing speed typically declines after the 3rd decade (20s).

Attention and Language

• Attention: The ability to focus and concentrate. Complex attention tasks decline with age.

  • Selective Attention: Focusing on specific stimuli in the environment (e.g., driving).

  • Divided Attention: Focusing on multiple tasks simultaneously (e.g., speaking on the phone while cooking).

• Language: Involves both crystallised and fluid intelligence. Language abilities remain largely intact with ageing.

Memory

• Declarative (Explicit) Memory: Conscious recall of facts and events (e.g., remembering a birthday). Shows lifelong decline but is often preserved in normal ageing.

• Non-Declarative (Implicit) Memory: Unconscious memory for skills and procedures (e.g., riding a bike, tying shoelaces). Tends to be less affected by ageing.

Visuospatial and Construction Abilities

• Visuospatial Abilities: Understanding spatial relationships and dimensions. These abilities tend to remain stable with age.

• Construction Abilities: The ability to assemble parts into a coherent whole (e.g., putting together furniture). May decline with ageing.

Other Cognitive Changes

• Concept Formation and Abstract Thinking: Older adults may show reduced flexibility and slower concept formation compared to younger adults.

• Inhibitory Control: The ability to inhibit automatic responses and generate novel responses may decline.

• Inductive Reasoning: Reasoning with unfamiliar tasks or verbal problems may become more challenging.

Mild Cognitive Impairment (MCI)

Definition and Relevance

• Mild Cognitive Impairment: A noticeable change in cognitive function that is greater than expected for age but not severe enough to interfere significantly with daily living or independence.

• MCI may progress to dementia, but some individuals remain stable or improve.

• Early identification and intervention are important for maintaining cognitive function.

Differentiating Dementia, Delirium, and Depression

Overview Table

Dementia

• Dementia: A group of symptoms affecting memory, thinking, and social abilities severely enough to interfere with daily functioning. Not a normal part of ageing.

• Common types include Alzheimer's disease, Lewy Body Disease, and Frontal Temporal Lobe Dementia.

• Symptoms: Difficulty with executive function, attention, memory, language, social behavior, and perceptual-motor function.

• Progresses from mild forgetfulness to severe dependence and inactivity.

Delirium

• Delirium: An acute, fluctuating disturbance in attention and cognition, often reversible. Common in older adults, especially during illness or after surgery.

• Subtypes:

  • Hypoactive: Passive, lethargic, drowsy.

  • Hyperactive: Agitated, aggressive, hallucinations.

  • Mixed: Features of both hypoactive and hyperactive.

  • Psychomotor Subtype: Altered cognition with normal psychomotor activity.

• Symptoms: New or worsening mental changes, fluctuating severity, incoherent speech, altered awareness.

Depression

• Depression: A mood disorder characterized by persistent sadness, loss of interest, and other symptoms. Can mimic dementia or co-occur with it.

• Symptoms: Low mood, loss of pleasure, sleep problems, anxiety, impaired recovery from illness, increased risk of suicide.

• Treatment is effective but often underdiagnosed in older adults.

Assessment of Cognitive Impairment

Principles and Tools

• Comprehensive assessment includes history from the patient and informants, mental state examination, neurological and psychiatric evaluation, and review of medications.

• Imaging (e.g., MRI, PET scan) may be used to rule out other causes.

• Assessment tools:

  • Mini-Mental State Examination (MMSE): Assesses orientation, concentration, memory, language, and visuospatial abilities.

  • Tasks include recalling objects, drawing, writing sentences, identifying date and location.

Principles of Care for Older Adults with Neurocognitive Disorders

Person-Centered Care

• Communicate diagnosis clearly and compassionately.

• Provide accessible written and verbal information about symptoms, progression, treatment options, and support services.

• Include financial/legal advice, driving safety, and community support.

• Involve the person as an active participant in care, considering their needs, strengths, and preferences.

Assessment and Management Strategies

• Identify and treat underlying causes (e.g., infection, medication effects, depression).

• Monitor vital signs, mental state, and neurological status.

• Promote comfort, safety, and recovery; minimize restraints and unnecessary interventions.

• Encourage family involvement and maintain routines.

• Use medications judiciously; non-pharmacological interventions are preferred when possible.

References

• Harada, Nataison Love (2013). Normal cognitive aging. Clinics in Geriatric Medicine.

• World Health Organization (2021). Dementia: Key Facts.

• Busby-Whitehead (2022). Neurocognitive disorders.

• Additional info: Academic context and details inferred from standard Anatomy & Physiology and Geriatric Nursing textbooks.