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Difficulty: MediumHuman Factors and Cognitive Biases

A 62-year-old woman is evaluated in the ambulatory clinic for progressive fatigue, diffuse muscle aches, and depressed mood over the past month. The physician, having diagnosed three patients with hypothyroidism who presented with identical symptoms earlier that same week, immediately suspects that this patient also has hypothyroidism. The physician orders a thyroid-stimulating hormone (TSH) level and a free T4 level but decides to forgo a comprehensive metabolic panel to save costs. The patient is sent home to await the laboratory results. Two days later, the thyroid function tests are reported as normal. The patient subsequently presents to the emergency department with severe dehydration and confusion, and is found to have severe hypercalcemia secondary to an undiagnosed malignancy. Which of the following cognitive biases most likely contributed to the physician's initial diagnostic error in the clinic?

  1. Availability heuristicAnswer
  2. B
    Anchoring bias
  3. C
    Confirmation bias
  4. D
    Premature closure
  5. E
    Framing effect

Answer

Availability heuristic
The availability heuristic is a cognitive shortcut where a person relies on immediate examples that come to mind when evaluating a specific topic, concept, method, or decision. In clinical medicine, this often occurs when a physician overestimates the pre-test probability of a disease because they have recently seen several cases of it or recently encountered a particularly memorable case. In this vignette, the physician's recent experience with three hypothyroidism patients directly caused them to jump to the same diagnosis for the current patient, bypassing a broader differential.

Step-by-Step Solution

1
Analyze the physician's decision-making process described in the vignette.
The physician formed an immediate diagnostic hypothesis based on having recently seen three identical presentations.
Identifying the specific trigger for the cognitive error is essential to classifying the type of bias.
2
Differentiate between the available cognitive bias options based on the identified trigger.
Relying on recent or memorable experiences to estimate the probability of a current event perfectly defines the availability heuristic.
Distinguishing between similar biases (like anchoring versus availability) requires matching the clinical behavior to the exact psychological definition of the heuristic.

Key Concept

The availability heuristic is a cognitive bias where a clinician overestimates the likelihood of a diagnosis because of recent, frequent, or highly memorable encounters with that condition.
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Topics

Human Factors and Cognitive Biases

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