Depression in the Elderly
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Direct answer
Depression beginning after sixty behaves differently: it travels with cerebrovascular disease (the "vascular depression" of white-matter hyperintensities and executive dysfunction), it mimics and masks dementia, and it carries real suicide risk — older Indian men are repeatedly highlighted in national crime records data as a high-risk group. Sertraline is the best-evidenced first-line antidepressant, started at half dose and titrated slowly, with full trials lasting up to 8-12 weeks because response arrives late. Tricyclics and strongly anticholinergic drugs are avoided, sodium is checked within the first weeks for SSRI-induced hyponatraemia, and ECT — far from a last resort — is the fastest, safest option for psychotic depression, food refusal, catatonia or active suicidality in a frail patient.
What you must remember
- Vascular depression: late-life depression linked to silent lacunar infarcts and white-matter disease; presents with psychomotor slowing, executive dysfunction and poorer antidepressant response — treat vascular risk factors in parallel.
- Pseudodementia (dementia syndrome of depression): abrupt onset, patients complain of memory loss effortfully and answer "I don't know", memory gaps inconsistent, cognition improves as mood improves; true dementia insinuates slowly and patients conceal deficits.
- Pharmacology of ageing: start low, go slow; sertraline best supported, escitalopram acceptable; avoid tricyclics (anticholinergic, orthostatic falls, cardiac) and paroxetine (anticholinergic and interaction-prone).
- Hyponatraemia: SSRIs and SNRIs cause SIADH-type hyponatraemia, risk highest in the old within the first 2-4 weeks — check sodium if there is new confusion, drowsiness or falls.
- Anticoagulant and antiplatelet interactions: SSRIs add bleeding risk with aspirin and warfarin, both ubiquitous prescriptions in Indian elderly cardiology patients.
- Duration: continue the antidepressant for 1-2 years after remission, indefinitely after three or more episodes — late-life relapse is the rule.
- ECT indications in the old: psychotic depression, refusal of food and fluids, high suicide risk, intolerance of drugs, and need for rapid response — response rates are excellent.
Approach to a 70-year-old with low mood
The consultation usually opens with a body, not a mood: "weakness", poor sleep, aches — somatic presentation dominates in Indian elderly patients, and "depression" is often rejected as a label. The clinician screens with the Geriatric Depression Scale, then separates three look-alikes. First, dementia versus pseudodementia: she says she cannot remember, tries hard, answers "I don't know" to orientation questions she later answers when calmer — depression until proven otherwise, and the cognitive score may normalise with treatment. Second, bereavement and loneliness versus major depression: after a spouse's death, two months of simple yearning differs from persistent worthlessness, anhedonia and weight loss with hopelessness.
Third, medical mimics: hypothyroidism, B12 and folate deficiency (both common in Indian vegetarian elderly), anaemia and early parkinsonism all masquerade as depression and are cheap to exclude. Treatment then begins with sertraline 25 mg — half the adult start — advancing every one to two weeks toward 50-100 mg, with the explicit warning that benefit takes 6-12 weeks. At every visit, ask directly about suicide; passive death wishes in the elderly are frequently voiced and frequently dismissed. If she stops eating or develops nihilistic delusions, the plan changes same-day: ECT, not a second tablet.
Where the exam plants the trap
The classic paired stem contrasts pseudodementia with early dementia, and the discriminating answers are effort and insight — the depressed patient complains of poor memory and gives "don't know" answers, the demented patient confabulates and hides deficits. A second trap is drug choice: the option list will offer amitriptyline, and its anticholinergic burden, orthostatic hypotension and arrhythmia risk make it the wrong answer in anyone over 65 with falls or cardiac disease. Third, hyponatraemia: new confusion two weeks into an SSRI is SIADH until serum sodium proves otherwise — a cross-over question medicine and psychiatry papers both enjoy.
Frequently asked questions
What is vascular depression?
A late-life depressive syndrome associated with cerebrovascular disease — white-matter hyperintensities and lacunar infarcts — featuring psychomotor slowing and executive dysfunction, with comparatively poorer antidepressant response.
How does pseudodementia differ from true dementia?
Pseudodementia has abrupt onset, prominent complaining of memory loss, effortful "I don't know" answers and reversible cognitive impairment with depression treatment, whereas dementia has insidious onset with concealed deficits and progressive decline.
Which antidepressant is preferred first line in the elderly?
Sertraline, on the strength of trial evidence and its clean interaction profile, started at half dose and titrated slowly over 8-12 week trials.
What electrolyte complication must be watched with SSRIs in older patients?
Hyponatraemia from SIADH, most likely in the first 2-4 weeks, presenting as new confusion, lethargy, unsteadiness or falls.
When is ECT preferred over antidepressants in late-life depression?
In psychotic depression, life-threatening food or fluid refusal, catatonia, severe suicidality, drug intolerance, or whenever a rapid response is essential in a frail patient.