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Difficulty: MediumNeurocognitive Disorders

A 74-year-old retired teacher is brought to her primary care physician by her daughter due to progressive forgetfulness and difficulty managing her finances over the past two years. Her medical history includes well-controlled hypertension and hyperlipidemia. The physician suspects a major neurocognitive disorder. Arrange the following diagnostic steps in the most appropriate sequential clinical workflow, from the initial encounter to advanced diagnostic testing.

  1. 1Gather collateral history from the family and perform a comprehensive medication review.
  2. 2Administer a validated bedside cognitive screening instrument (e.g., Montreal Cognitive Assessment).
  3. 3Order routine laboratory evaluation to assess for reversible systemic or metabolic etiologies.
  4. 4Obtain structural brain imaging to evaluate for cerebrovascular disease, structural lesions, or specific atrophy patterns.
  5. 5Refer for formal specialized neuropsychological testing if the diagnosis remains ambiguous.

Answer

The correct sequential workflow is: 1) Clinical interview and medication review, 2) Objective bedside cognitive screening, 3) Laboratory testing for reversible causes, 4) Structural neuroimaging, and 5) Formal neuropsychological testing.
The evaluation of suspected major neurocognitive disorder follows a logical progression from least invasive and most fundamental to most specialized. It begins with a comprehensive history and medication review, as collateral information is vital and polypharmacy is a frequent culprit. This is immediately followed by a bedside cognitive screen (e.g., MoCA) to objectively quantify the deficit. Once impairment is confirmed, standard laboratory tests are drawn to rule out reversible metabolic or nutritional causes. Structural imaging follows to exclude macroscopic brain pathology such as tumors, bleeds, or hydrocephalus. Finally, if the diagnosis remains uncertain, formal neuropsychological testing is requested to clarify the specific neurocognitive domains affected.

Step-by-Step Solution

1
Initiate the evaluation with a comprehensive history and medication review.
Establishes the timeline of symptoms, incorporates caregiver collateral information, and rules out polypharmacy.
History is the most critical component of psychiatric and neurologic diagnoses.
2
Administer an objective screening tool like the MoCA or MMSE.
Provides quantifiable evidence of cognitive impairment.
Subjective memory complaints must be objectively verified before proceeding with an extensive medical workup.
3
Check routine blood tests (e.g., Vitamin B12, TSH).
Identifies or excludes common systemic, endocrine, or nutritional causes of pseudodementia or reversible cognitive decline.
Ruling out reversible medical conditions is a mandatory next step in the dementia algorithm.
4
Order structural neuroimaging (MRI or CT).
Visualizes the brain parenchyma to check for infarcts, masses, hydrocephalus, or distinct regional atrophy.
Imaging helps differentiate between neurodegenerative causes (like Alzheimer's) and structural/vascular causes.
5
Consider formal neuropsychological testing.
Yields a detailed profile of cognitive strengths and weaknesses across multiple domains.
This is a specialized, final diagnostic step used when standard evaluation fails to confidently differentiate between dementia subtypes or distinguish dementia from major depressive disorder.

Key Concept

Standard diagnostic evaluation pathway for major neurocognitive disorders.
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Topics

Neurocognitive Disorders

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