7c: Geriatric Depression

Geriatric Depression: Prevalence and Clinical Features

Classifications and Prevalence
- Geriatric depression primarily encompasses Major Depression and Dysthymia, the latter of which is now referred to as Persistent Depressive Disorder.
- In individuals over the age of $65$ , the prevalence of depression is approximately $1\%$ .
- There is a significant disparity in prevalence rates based on the living environment:
  - Residential Care: Approximately $32\%$ an prevalence rate.
  - Community Settings: Approximately $14.4\%$ an prevalence rate.
- High rates of suicide are a critical concern within this demographic.
Symptomatology and Presentation
- Memory issues are the most frequently reported symptom by the patients themselves.
- Clinical presentation is often complicated by difficulties in distinguishing depressive symptoms from those arising from other comorbid medical conditions or side effects of medications.
Late-Onset Depression (After Age $60$ )
- Depression occurring for the first time after age $60$ typically exhibits specific characteristics:
  - Greater levels of cognitive dysfunction.
  - Higher rates of physical fatigue.
  - Significant comorbidity with other medical illnesses.
  - A less pronounced biological link compared to early-onset depression.
  - Generally follows a chronic course with a poor prognosis.
Treatment Modalities
- Cognitive-Behavioural Therapy (CBT): Utilized for restructuring negative thought patterns.
- Interpersonal Therapy (IPT): Focused on improving the quality of social interactions and relationships.
- Antidepressant Medications: Pharmacological intervention.
- Combinations: Integrating psychological therapies with medication for optimal outcomes.

Differential Diagnosis: Depression vs. Dementia

Distinguishing between depression and dementia is essential due to overlapping symptoms. The following distinctions are noted:

Depression Profile
- Reporting: Patients tend to overreport their cognitive symptoms.
- Cognitive Deficits: Primarily manifest as attention and executive dysfunction problems.
- Vegetative Symptoms: Present throughout the duration of the illness.
- Awareness: The patient is often the one to identify and voice the problem.
- Test Performance: Performance on cognitive tests improves with effort, particularly if the clinical affect of the patient is increased during the session.
Dementia Profile
- Reporting: Patients tend to underreport their cognitive symptoms.
- Cognitive Deficits: Includes a range of cognitive problems, with memory loss being prominent.
- Vegetative Symptoms: Typically only emerge in the later stages of the disorder.
- Awareness: Family members, caregivers, or others notice the symptoms more than the patient does.
- Test Performance: The patient will not show improvement on test results, regardless of their affect or the effort they apply.

Delirium: Characteristics and Differential Diagnosis

Clinical Definition of Delirium
- An altered state of consciousness characterized by an acute onset and reversible disturbance.
- Core symptoms include:
  - Difficulty concentrating.
  - Disruption of the sleep-wake cycle.
  - Incoherent or rambling speech.
  - Memory impairment.
  - Perceptual disturbances.
  - Fluctuating mood and activity swings.
Differential Diagnosis: Delirium vs. Dementia
- Delirium Characteristics:
  - Reversible with appropriate medical treatment.
  - Affects individuals of all ages (both young and old).
  - Acute condition with sudden onset.
  - Notable fluctuations in alertness, attention, and global cognition.
  - Speech may appear incoherent, similar to the appearance of intoxication or psychosis.
  - Important note: Delirium can occur as a superimposed condition in those who already have dementia.
- Dementia Characteristics:
  - While sometimes reversible, it is more often deteriorative/degenerative.
  - Prevalence increases significantly with age.
  - Characterized by a progressive decline of cognitive abilities over time.
  - Leads to functional impairment in daily living.
  - May be associated with permanent personality changes and psychotic symptoms.

Assessment and Treatment for Neurocognitive Disorders

Assessment Procedures
- Accurate diagnosis is paramount and is achieved through:
  - Clinical History: Detailed background of the patient's symptoms and health.
  - Neuropsychological Assessments: Testing cognitive functions.
  - Neuroimaging: Visualizing brain structures and activity.
- Early diagnosis is critical as it improves clinical outcomes and facilitates long-term planning for the patient.
Treatment and Management Levels (Stepped Supervision)
- Management often follows a progression of care intensity:
  - Monitoring
  - Supervision
  - Assisted living
  - Nursing care
Therapeutic Interventions
- Supportive Care: Includes psychoeducation, psychotherapy, and specialized nursing care.
- Medications: These treat secondary symptoms rather than providing a cure. Common drugs include:
  - Cholinesterase inhibitors.
  - Antidepressants and antipsychotics.
- Psychological Treatment: Targeted toward managing behavioral symptoms such as wandering or aggression.
Lifestyle Factors and Management Strategies
- Evidence suggests the protective influence of lifestyle factors against cognitive decline: diet, physical exercise, and cognitive stimulation.
- Effective management strategies include:
  - Implementing specific communication strategies.
  - Modifying the physical environment for safety and clarity.
  - Providing pleasant and engaging activities for the patient.

Body, Brain, Life (BBL) Project

Overview
- The Body, Brain, Life (BBL) project is a research initiative by the National Centre for Epidemiology and Population Health at the Australian National University (ANU) College of Health & Medicine.
- Funded by the Dementia Collaborative Research Centres.
- Researcher: Professor Nicolas Cherbuin.
The Intervention
- A novel online intervention designed for middle-aged individuals at risk of dementia.
- Focuses on sustaining lifestyle changes to reduce the risk profile for dementia.
- Based on behavior change principles and modifiable risk factors identified through research.
Randomised Controlled Trial (RCT) Results
- The trial involved $176$ middle-aged adults.
- Three groups were compared:
  1. Standard online intervention.
  2. Online intervention augmented with face-to-face group sessions.
  3. Control group receiving weekly emails with links to health websites.
- Outcome: Participation in the BBL intervention led to a significantly reduced score on the ANU-Alzheimer's Disease Risk Index.
- The project is currently listed as completed.

Community and Societal Implications

Dementia-Friendly Communities
- The goal is to reduce stigma and promote awareness to create safer environments for those with neurocognitive disorders.
- The initiative seeks to empower people living with dementia to make their own life decisions.
- Kate Swaffer of Dementia Alliance International emphasizes that dementia-friendly communities are a matter of human rights and disability rights, allowing individuals to remain independent as long as possible.
Hogeweyk Dementia Village
- A specific real-world example of an innovative care model where residents live in a designed village setting that mimics normal life while providing high-level care.

Summary Statistics and Future Projections

Population Trends
- The aging population has led to an increased emphasis on geriatric conditions within the healthcare system.
- By the year $2050$ , it is projected that $3,000,000$ Australians will be living with dementia.
Prevalent Neurocognitive Disorders
- Alzheimer's Disease is categorized as the most prevalent form of dementia.
- Other significant forms mentioned include Frontotemporal dementia, Lewy body dementia, and Parkinson’s-related cognitive decline.
- Geriatric depression remains a major comorbid and independent concern for this population.