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Difficulty: HardPatient Safety and Quality Improvement

Match each clinical vignette demonstrating a diagnostic error to the specific cognitive bias it best represents.

  • A 65-year-old woman is admitted from the emergency department with a sign-out diagnosis of "decompensated heart failure." The internal medicine team focuses entirely on aggressive diuresis, ignoring her new-onset right calf swelling and acute pleuritic chest pain, which later reveals a pulmonary embolism.Anchoring bias
  • A 28-year-old man presents with a 3-day history of productive cough and fever. The physician immediately diagnoses acute bronchitis and concludes the visit without asking about the patient's recent return from an area endemic for tuberculosis or whether he has experienced night sweats.Premature closure
  • During a widespread local outbreak of influenza, a physician diagnoses a 54-year-old man presenting with severe diffuse muscle aches and fatigue as having the flu. The physician does not review the patient's medication list, which indicates he was started on high-dose rosuvastatin one week prior.Availability heuristic
  • An emergency department physician evaluates a patient for severe abdominal pain. The triage nurse's note prominently labels the patient as a "frequent visitor with known opioid use disorder," leading the physician to initially suspect drug-seeking behavior rather than appropriately evaluating for acute appendicitis.Framing effect
  • A physician strongly suspects systemic lupus erythematosus in a young woman with arthralgias. Upon receiving laboratory results, the physician emphasizes a weakly positive antinuclear antibody titer as definitive proof while ignoring a clearly positive parvovirus B19 IgM and the absence of other systemic criteria.Confirmation bias

Answer

The correct matches map each vignette to Anchoring bias, Premature closure, Availability heuristic, Framing effect, and Confirmation bias, respectively.
Each clinical vignette highlights a unique vulnerability in human cognition. Anchoring bias occurs when initial data points create a mental tether. Premature closure happens when a diagnostic search is aborted prematurely. The availability heuristic relies on recent memory rather than base rates. The framing effect demonstrates how wording and context manipulate objective assessment. Confirmation bias is the active filtering of evidence to support a favored diagnosis.

Step-by-Step Solution

1
Analyze the scenario involving the patient admitted with heart failure.
The team fails to deviate from the initial diagnosis despite new evidence.
This is the classic definition of anchoring bias, where the initial anchor prevents objective reassessment.
2
Analyze the scenario involving the young man with a cough.
The physician stops investigating after an initial plausible diagnosis is reached.
This represents premature closure, characterized by the phrase 'when the diagnosis is made, the thinking stops.'
3
Analyze the scenario involving muscle aches during a flu outbreak.
Recent prominent experiences dictate the diagnostic choice over a thorough review.
This defines the availability heuristic, where easily recalled events skew probability estimation.
4
Analyze the scenario involving the patient labeled with opioid use disorder.
The clinical approach is altered based on the subjective presentation of the patient's history.
This demonstrates the framing effect, where context alters perception.
5
Analyze the scenario involving suspected lupus and conflicting lab results.
The physician cherry-picks data that supports their initial hypothesis.
This describes confirmation bias, which focuses on validating evidence while dismissing refuting evidence.

Key Concept

Cognitive biases are systematic errors in thinking that can lead to diagnostic errors and patient harm.
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Topics

Patient Safety and Quality Improvement

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