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Difficulty: MediumHuman Factors and Cognitive Biases

A 28-year-old woman presents to an urgent care clinic complaining of a sudden, severe headache associated with nausea and dizziness. Over the preceding two weeks, a severe winter storm caused widespread power outages in the region, leading to a surge of patients presenting to this clinic with carbon monoxide poisoning from the indoor use of portable generators. Upon hearing the patient's symptoms, the evaluating physician immediately orders a carboxyhemoglobin level and places the patient on high-flow oxygen, assuming this is another case of carbon monoxide toxicity. The physician does not perform a fundoscopic examination or assess for nuchal rigidity. The carboxyhemoglobin level returns within normal limits. The patient is later transferred to a local emergency department where a noncontrast head CT reveals a subarachnoid hemorrhage. Which of the following cognitive errors most likely influenced the urgent care physician's initial diagnostic reasoning?

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

Answer

Availability heuristic
The availability heuristic occurs when a clinician overestimates the likelihood of a diagnosis based on how easily similar past events or cases come to mind. In this scenario, the physician's diagnostic reasoning is heavily influenced by the recent, prominent surge of carbon monoxide poisoning cases in the clinic. Because these cases are easily recalled, the physician inappropriately assumes the current patient has the same condition, leading to a missed diagnosis of a subarachnoid hemorrhage.

Step-by-Step Solution

1
Analyze the physician's diagnostic trigger and process.
The physician immediately suspected carbon monoxide poisoning without performing a complete neurological examination.
Identifying what caused the physician to take a diagnostic shortcut is essential to classifying the error.
2
Identify the contextual factors influencing the physician.
The clinic had recently seen a surge of carbon monoxide poisoning cases due to a winter storm.
Environmental and systemic factors often precipitate specific cognitive biases.
3
Match the physician's behavior to the appropriate cognitive bias definition.
The behavior perfectly matches the availability heuristic, where recent, frequent, or emotionally memorable events heavily influence diagnostic probability estimates.
Accurate classification requires distinguishing between related cognitive errors based on their core mechanisms.

Key Concept

Availability heuristic in clinical decision-making
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Topics

Human Factors and Cognitive Biases

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