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Zorluk: OrtaDiagnostic Workup and Test Sequencing

A 72-year-old retired accountant is brought to the outpatient clinic by his son due to progressive memory decline over the past 14 months. The son reports that the patient frequently forgets recent conversations, misplaces household items, and recently struggled to balance his checkbook, a task he previously managed with ease. The patient has a medical history of essential hypertension and benign prostatic hyperplasia. Current medications include lisinopril and tamsulosin. Vital signs are within normal limits. On physical examination, there are no focal neurological deficits, and his gait is normal. The patient scores 22/30 on a standardized cognitive assessment.

According to current guidelines, which of the following investigations are indicated as part of the initial concurrent diagnostic workup to evaluate for reversible causes of this patient's cognitive decline? (Select all that apply)

  1. Serum vitamin B12 levelCevap
  2. Serum thyroid-stimulating hormone (TSH) levelCevap
  3. C
    Apolipoprotein E (APOE) epsilon 4 allele genotyping
  4. D
    Fluorodeoxyglucose positron emission tomography (FDG-PET) scan of the brain
  5. E
    Cerebrospinal fluid analysis for amyloid-beta and phosphorylated tau proteins

Cevap

The correct tests to include in the initial workup are the Serum vitamin B12 level and the Serum thyroid-stimulating hormone (TSH) level.
The initial diagnostic workup for a patient presenting with new-onset progressive cognitive impairment requires screening for common and potentially reversible metabolic causes. Current guidelines mandate checking a serum vitamin B12 level and a thyroid-stimulating hormone (TSH) level in all such patients. Identifying these deficiencies is crucial because they are treatable conditions that can present with cognitive decline mirroring neurodegenerative dementias.

Adım Adım Çözüm

1
Analyze the patient's clinical presentation.
The patient demonstrates insidious, progressive cognitive decline affecting instrumental activities of daily living without focal neurological deficits, highly suggestive of a major neurocognitive disorder (dementia).
Establishing the clinical syndrome dictates the subsequent diagnostic pathway.
2
Determine the standard guidelines for the initial evaluation of suspected dementia.
The initial evaluation must include screening for common, potentially reversible metabolic and systemic causes of cognitive impairment.
Before diagnosing irreversible neurodegenerative conditions like Alzheimer disease, treatable etiologies must be formally excluded.
3
Select the appropriate initial laboratory tests based on guidelines.
Routine laboratory screening requires concurrent testing of serum TSH and Vitamin B12 levels, alongside basic chemistries and a complete blood count.
Hypothyroidism and Vitamin B12 deficiency are classic, reversible causes of cognitive impairment that can mimic primary dementias.

Anahtar Kavram

The initial diagnostic evaluation of progressive cognitive impairment requires objective cognitive testing, structural neuroimaging, and specific laboratory screening (TSH and Vitamin B12) to rule out reversible causes.
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Diagnostic Workup and Test Sequencing

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