Late-Life Depression

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LLD: Basics - Defining Despair

  • Definition: Major Depressive Disorder (MDD) or clinically significant depressive symptoms with onset at age ≥60-65 years.
  • Significance:
    • Common, yet often underdiagnosed & undertreated.
    • Impact: ↑ morbidity, ↑ mortality, ↓ Quality of Life (QoL).
  • Epidemiology:
    • Prevalence:
      • Community: 1-5% (MDD), 10-15% (depressive symptoms).
      • Primary Care: 5-10%.
      • Long-term Care Facilities: 12-30%.
    • Gender: Higher prevalence in women (F > M).

⭐ Late-life depression is a significant risk factor for developing dementia.

LLD: Origins - Unraveling Roots

LLD's etiology is multifactorial, understood via a Biopsychosocial model:

  • Biological Factors:
    • Neurotransmitter changes (↓ Serotonin, ↓ Norepinephrine, ↓ Dopamine)
    • HPA axis dysregulation (often ↑ cortisol)
    • Genetic predisposition (e.g., family history)
    • Cerebrovascular disease ('vascular depression' hypothesis)
      • Linked to white matter hyperintensities (WMHs)
    • Chronic inflammation (e.g., ↑ pro-inflammatory cytokines)
    • Structural brain changes (e.g., cortical atrophy, WMHs)
  • Psychosocial Factors:
    • Chronic medical illness, disability, chronic pain
    • Polypharmacy (adverse effects, interactions)
    • Bereavement, social isolation, loneliness
    • Financial strain, caregiver burden
    • Past trauma or significant life stressors

Vascular depression risk factors and pathophysiology

⭐ The 'vascular depression' hypothesis posits that cerebrovascular lesions disrupt fronto-striatal-limbic pathways, increasing vulnerability to depression.

LLD: Presentation & Diagnosis - Spotting Shadows

  • Core Symptoms (📌 SIGECAPS): DSM-5: ≥5 symptoms for ≥2 weeks (must include depressed mood or anhedonia).
    • Sleep disturbance
    • Interest ↓ (anhedonia)
    • Guilt/worthlessness
    • Energy ↓ (fatigue)
    • Concentration ↓
    • Appetite change/weight change
    • Psychomotor agitation/retardation
    • Suicidal ideation
  • Atypical Presentations:
    • Prominent somatic complaints (pain, GI upset), anxiety, irritability, apathy.
    • Cognitive impairment ('depressive pseudodementia'), social withdrawal. Less overt sadness.
  • Diagnosis:
    • DSM-5/ICD-11 criteria.
    • Screening: Geriatric Depression Scale (GDS-15 >5), PHQ-9 (>10).
  • Differential Diagnosis:
    • Dementia (Alzheimer's, Vascular), Delirium.
    • Medical: Hypothyroidism, Parkinson's. Medication side effects.

⭐ In 'depressive pseudodementia', cognitive deficits often improve significantly with antidepressant treatment, unlike in true dementia where decline is progressive.

LLD: Management & Prognosis - Guiding Lights

General Principles:

  • "Start low, go slow."
  • Monitor side effects (e.g., hyponatremia with SSRIs, QTc prolongation, fall risk) & drug interactions.

Pharmacotherapy:

  • First-line: SSRIs (e.g., Sertraline 25-50mg, Escitalopram 5-10mg).
  • SNRIs (Venlafaxine, Duloxetine) as alternatives.
  • Avoid TCAs, MAOIs if possible.
  • Consider augmentation for partial response.

Psychotherapy:

  • Problem-Solving Therapy (PST), Interpersonal Therapy (IPT), Cognitive Behavioral Therapy (CBT).
  • Effective alone or combined with medication.

Electroconvulsive Therapy (ECT):

  • For severe, treatment-resistant, psychotic depression, or urgent need (suicidality, inanition).

⭐ ECT is a safe, highly effective treatment for severe LLD, even in frail elderly, with precautions.

Other: Lifestyle modifications, social support.

Prognosis:

  • Variable; ↑relapse, chronicity. Comorbidities impact. ⚠️ High suicide risk.

Treatment Algorithm:

High‑Yield Points - ⚡ Biggest Takeaways

  • Late-life depression often presents with somatic symptoms, anxiety, not just overt sadness.
  • Strong link to vascular risk factors, cerebrovascular disease (vascular depression).
  • ↑ risk of cognitive impairment, dementia; consider pseudodementia.
  • SSRIs first-line (start low, go slow); ECT safe, effective for severe/resistant cases.
  • Higher suicide risk, particularly in older, isolated males.
  • Often co-occurs with chronic medical illnesses, polypharmacy.
  • Differentiate from normal bereavement, adjustment disorders.

Practice Questions: Late-Life Depression

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Among which of the following conditions is suicide risk highest?

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_____ age is a risk factor for delusional disorders

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_____ age is a risk factor for delusional disorders

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