Old Age Psychiatry Flashcards

Chapter 10: Depression

Overview of Late Life Depression

  • Definition: Late life depression is a complex disorder resulting from the interplay of stressful events, personality vulnerability, and physical illness.

  • Associated Risks: It is linked to significant distress, disability, and increased risk for suicide and dementia.

Classification of Depression

  • The chapter focuses on unipolar depression, equated with ICD-10 or DSM-5 Major Depressive Disorder (MDD) in older adults.

  • Population: The cohort includes primarily two groups:

    • Individuals with recurrent early onset depression who have aged into older adulthood.

    • Individuals with late onset (LO) depression.

  • Age Cut-offs: Literature varies on age cut-offs for old age and LO, ranging from 50 to 65 years.

Epidemiology of Late Life Depression

  • General Trends: Prevalence of MDD declines with age in community studies.

  • Gradient: Prevalence increases from community settings to primary care, medical care, and residential aged care settings.

  • Estimated Prevalence: The pooled prevalence rate for late life depression has been estimated at around 7%.

    • Contrasting with a 12-month prevalence of 2.2% in community-dwelling older Australians based on the National Mental Health and Well-Being Survey, compared to an overall rate of 6.3%.

  • Methodological Issues: Arguments exist that discrepancies in lower prevalence rates with age could be due to methodological limitations, not reflecting the actual underrepresentation of unhealthy elderly, exclusion of institutionalized persons, or misattributed symptoms.

  • Healthy Survivor Effect: One theory is that lower MDD rates with age may reflect a healthy survivor effect due to higher mortality for depressed individuals earlier in life.

  • Psychological Immunization: Suggests that individuals may develop increased resilience to adverse events over time.

  • Lifetime prevalence rates for MDD were notably lowest in those aged 60 and older in the U.S. National Comorbidity Survey Replication.

    • Median age of MDD onset is 30, with onset concentrated between ages 18 and 43.

  • Sub-Syndromal Depression (SSD):

    • Defined as having two to four symptoms; SSD rates are two to three times higher than MDD rates.

    • Up to 10% of older adults with SSD may develop MDD annually.

    • SSD impacts functional outcomes and can lead to psychosocial disability, with higher prevalence in women and among certain ethnicities (e.g., higher rates in African American elders).

Clinical Features of Depression in Late Life

  • Differential Expression: Meta-analysis shows older adults experience greater symptoms of agitation, hypochondriasis, somatic symptoms, and severe depression compared to younger individuals.

    • No age-specific diagnostic criteria exist for depression.

  • Comorbid Disorders: High prevalence of comorbid physical and cognitive disorders complicates MDD diagnosis.

  • Inclusive Approach: It is suggested to include psychological symptoms while interpreting symptoms more holistically.

  • Depression Types:

    • Non-Melancholic Depression (reactive/neurotic): Characterized by mood changes due to life events and associated features like anhedonia, sleep/appetite changes, and impaired concentration.

    • Melancholic Depression: More severe and common with age; manifests as a non-reactive mood and pervasive anhedonia.

    • May include psychotic symptoms leading to psychotic depression, marked by guilt and hopelessness.

    • Atypical Depression: Characterized by hyperphagia and weight gain; is the least common subtype.

Depression and Cognitive Impairment/Dementia

  • Depression's effects on cognitive impairment are notable, especially with age.

    • Pseudodementia: Traditional belief that cognitive deficits resolve with depression remission is being questioned.

    • Recent studies show cognitive decline continues even after remission, with older adults exhibiting deficits more profound than controls.

    • Link between late life depression and increased risk of vascular dementia and Alzheimer’s disease.

Aetiology of Late Life Depression

  • Main Factors: The causes of late life depression emerge from a mix of:

    • Adverse Life Events: Early experiences of abuse linked to later depression.

    • Personality Vulnerability: Traits like neuroticism can exacerbate depression risk.

    • Physical Illness: Physical ailments may contribute directly or indirectly to the emergence of depression.

  • Adverse childhood experiences correlate with late life depression, wherein higher levels of early marital stress also affect later outcomes.

  • Social Isolation: A major contributing factor, where subjective assessments of social support are more significant than mere social network size.

Assessment of Late Life Depression

  • Clinical Evaluation: Include assessing risks for self-harm and nutritional adequacy, excluding other psychological disorders.

  • Diagnostic Tools: Utilize depression rating scales like the Geriatric Depression Scale (GDS) and cognitive assessments.

  • Targeted Investigations: Look into physical illnesses commonly associated with late life depression, along with neuroimaging.

Treatment of Late Life Depression

  • Variability in Presentation: Treatment requirements vary; many with mild depression remit spontaneously.

  • Access to Treatment: Cultural and socio-economic factors play roles in treatment receipt.

  • Psychological Therapies: CBT found effective, with attention to adaptations for older patients.

  • Pharmacotherapy: Antidepressants generally effective in older adults:

    • Most reviews indicate SSRIs and tricyclics have similar efficacy, but tricyclics show more effectiveness in specific depressive forms.

    • Augmentation strategies may be necessary; lithium and aripiprazole have evidence for effectiveness.

Depression in Dementia

  • Prevalence: Depression rates in Alzheimer's disease are between 20-25%, higher in other types of dementia.

  • Efficacy of Antidepressants: Mixed evidence regarding efficacy due to the challenges in interpretation from varied study quality.

Suicide in Late Life

  • Statistics: Older adults commit approximately 17% of suicides, double their demographic proportion in the population.

  • Ideation vs. Completion: Non-fatal suicidal behavior decreases with age; psychological distress noted as a significant predictor of ideation.

  • Risk Factors: Key predictive factors include dissatisfaction with social support, and characteristics like being male and living alone.

Prognosis

  • Long-term Outcomes: High rates of recurrent depression with only a quarter achieving effective remission.

    • High risk of suicidal behavior and dementia.

    • Certain individuals may transition from MDD to bipolar disorder, with a latent onset period for manic episodes.

References

  • [Multiple references cited supporting various sections of the chapter]

  • Note: Insert citations from the provided reference list above as needed.