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Difficulty: MediumNeurocognitive Disorders

A 68-year-old man is brought to the geriatric psychiatry clinic by his son for evaluation of worsening memory. The son reports that his father has been increasingly forgetful over the past 4 months, frequently missing appointments and neglecting to pay bills. The patient's wife passed away unexpectedly 6 months ago. Since her death, the patient has lost 5 kg (11 lbs), complains of waking up at 3:00 AM every morning and being unable to return to sleep, and has lost interest in his usual hobby of gardening. During the interview, the patient makes poor eye contact and appears apathetic. When asked about recent news events to test his memory, he immediately sighs and responds, "I just don't know, my memory is terrible." With significant encouragement and prompting, he is able to recall 2 out of 3 words after 5 minutes and correctly draw a clock. His physical and neurological examinations are unremarkable. Which of the following clinical features most strongly supports a diagnosis of major depressive disorder with cognitive impairment (pseudodementia) rather than Alzheimer disease in this patient?

  1. Tendency to highlight cognitive deficits and frequently answer "I don't know"Answer
  2. B
    Objective decline in instrumental activities of daily living
  3. C
    Presence of impaired delayed recall on cognitive assessment
  4. D
    Absence of focal neurological deficits on physical examination
  5. E
    Development of sleep disturbances and decreased appetite

Answer

The tendency to highlight cognitive deficits and frequently answer "I don't know" during testing.
Patients with major depressive disorder can develop significant cognitive impairment, a condition often termed pseudodementia. A key distinguishing feature between pseudodementia and a true neurodegenerative dementia (such as Alzheimer disease) is the patient's attitude toward their cognitive decline. Patients with pseudodementia typically have a subacute symptom onset, maintain acute insight into their deficits, frequently complain about their memory loss, and exhibit poor effort on cognitive testing (often giving up easily and defaulting to "I don't know"). In contrast, patients with Alzheimer disease typically have an insidious onset, lack insight into their deficits (anosognosia), minimize their memory loss, and will often attempt to answer questions or confabulate rather than giving up. This patient's prominent complaints about his memory and tendency to say "I don't know" before performing well with encouragement strongly point to underlying depression.

Step-by-Step Solution

1
Identify the patient's primary symptoms and timeline.
The patient has 4 months of memory loss, apathy, weight loss, and insomnia starting 2 months after the death of his wife.
Establishes a temporal relationship between a major psychosocial stressor (bereavement) and the subacute onset of cognitive and mood symptoms.
2
Analyze the patient's behavior during the cognitive assessment.
The patient complains about his poor memory, gives poor initial effort ("I don't know"), but performs adequately with encouragement.
Differentiates the lack of effort seen in depression from the genuine loss of cognitive capacity and lack of insight seen in true dementia.
3
Compare the findings against classic presentations of major neurocognitive disorder.
Alzheimer disease typically presents with insidious onset, lack of insight (anosognosia), and attempts to guess or confabulate when unable to answer.
Confirms that the patient's presentation aligns with pseudodementia rather than a primary neurodegenerative process.

Key Concept

Differentiating major depressive disorder with cognitive impairment (pseudodementia) from primary neurodegenerative dementias like Alzheimer disease.
Estimated Time:1m 30s
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Topics

Neurocognitive Disorders

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