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Difficulty: MediumNeurocognitive Disorders

A 78-year-old man residing in an assisted living facility is evaluated for a decline in his cognitive abilities over the past 3 months. The nursing staff report that he has stopped participating in social activities, frequently stays in his room with the blinds drawn, and has lost 4.5 kg (10 lb) during this period. When asked about his memory, the patient becomes distressed and repeatedly states, "My mind is completely gone; I cannot remember anything anymore." On cognitive testing, he makes poor eye contact and frequently responds to questions with "I don't know," exhibiting minimal effort. However, when strongly encouraged by the examiner, he successfully performs complex attention tasks. His neurological examination shows no focal deficits. A non-contrast head CT performed 2 months ago after a mechanical fall was unremarkable. Laboratory studies, including thyroid-stimulating hormone and vitamin B12, are within normal limits. Which of the following is the most appropriate initial management for this patient?

  1. Initiate sertraline therapyAnswer
  2. B
    Initiate donepezil therapy
  3. C
    Initiate memantine therapy
  4. D
    Initiate haloperidol therapy
  5. E
    Initiate valproic acid therapy

Answer

The most appropriate initial management is to initiate sertraline therapy.
The patient is exhibiting signs of major depressive disorder (MDD) presenting with prominent cognitive impairment, a condition historically referred to as pseudodementia. In elderly patients, MDD frequently manifests with cognitive deficits, psychomotor retardation, and neurovegetative symptoms such as weight loss and social withdrawal. Key features that differentiate MDD from a progressive major neurocognitive disorder (e.g., Alzheimer disease) include a relatively rapid, identifiable onset, the patient's acute awareness of and distress regarding their memory loss, and a tendency to give 'I don't know' answers on cognitive testing. Furthermore, when encouraged, these patients can often complete complex tasks, demonstrating intact underlying cognition. The most appropriate initial step in management is to treat the underlying depression with a selective serotonin reuptake inhibitor (SSRI) such as sertraline, which typically leads to improvement in both mood and cognitive symptoms.

Step-by-Step Solution

1
Analyze the time course and character of the cognitive decline.
The patient has a 3-month history of cognitive decline accompanied by social withdrawal and weight loss.
Establishing the timeline helps differentiate between the insidious onset of neurodegenerative dementias and the subacute onset typical of mood disorders or delirium.
2
Evaluate the patient's performance and attitude during cognitive testing.
The patient shows significant distress about memory loss, frequently answers with 'I don't know', but performs well when actively encouraged.
These testing behaviors are hallmark signs of depression-related cognitive impairment. In contrast, patients with Alzheimer disease often lack insight into their deficits and attempt to cover them up (confabulation).
3
Determine the most appropriate initial therapy based on the primary diagnosis.
The clinical picture is consistent with major depressive disorder, indicating the need for an antidepressant such as an SSRI (sertraline).
Treating the underlying unipolar depression will likely lead to improvement in both the patient's mood and cognitive deficits.

Key Concept

Depression-related cognitive impairment (historically called pseudodementia) presents with a subacute onset of memory issues, prominent distress regarding cognitive deficits, and frequent 'I don't know' responses on testing. Treatment involves addressing the underlying depression with antidepressants such as SSRIs.
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Topics

Neurocognitive Disorders

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