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Difficulty: HardHuman Factors and Cognitive Biases

A 68-year-old woman with a history of heart failure and chronic obstructive pulmonary disease (COPD) is brought to the emergency department with acute dyspnea. The triage nurse evaluates the patient, notes an oxygen saturation of 88% on room air, and enters a chief complaint of "COPD exacerbation" into the electronic health record. The evaluating physician sees this triage note, auscultates bilateral wheezing, and immediately initiates treatment with inhaled bronchodilators and systemic corticosteroids. An hour later, laboratory and imaging results return, revealing a markedly elevated B-type natriuretic peptide (BNP) level of 1,200 pg/mL and a chest radiograph showing cardiomegaly with prominent bilateral interstitial infiltrates. Despite these objective findings strongly indicating acute decompensated heart failure, the physician interprets them as "baseline chronic changes" and continues aggressive COPD management without administering diuretics. Which of the following cognitive biases most likely led to this physician's diagnostic error?

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

Answer

Anchoring bias
Anchoring bias occurs when a clinician relies too heavily on the first piece of information provided (the 'anchor') and fails to adequately adjust their diagnostic probability when new, contradictory information becomes available. In this scenario, the physician anchored on the triage nurse's initial label of 'COPD exacerbation' and the initial finding of wheezing. Even when presented with objective evidence of acute decompensated heart failure (elevated BNP, pulmonary edema on radiograph), the physician failed to adjust the diagnosis, instead inappropriately dismissing the new data.

Step-by-Step Solution

1
Analyze the origin of the physician's diagnostic impression.
The physician formed an initial impression based on the triage nurse's label of "COPD exacerbation" and the initial physical exam finding of wheezing.
Identifying the starting point of the clinical reasoning process is essential to determine which cognitive error occurred.
2
Evaluate how the physician responded to new objective data.
When presented with a high BNP and a chest radiograph showing pulmonary edema, the physician failed to change the diagnosis, instead inappropriately dismissing the data as baseline changes.
The reaction to new data differentiates various cognitive biases from one another.
3
Classify the cognitive error based on the failure to adjust.
The failure to move away from an initial starting point despite contradictory evidence is defined as anchoring bias.
This matches the classic definition of anchoring in medical decision-making.

Key Concept

Anchoring Bias in Clinical Reasoning
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Topics

Human Factors and Cognitive Biases

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