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Zorluk: OrtaHuman Factors and Cognitive Biases

A 58-year-old man with a history of alcohol use disorder and two prior episodes of acute pancreatitis presents to the emergency department with severe, unremitting epigastric pain that radiates to his back. He is tachycardic and diaphoretic. The emergency physician immediately suspects recurrent acute pancreatitis and orders basic laboratory tests. The patient's serum lipase and amylase levels return well within normal limits. Despite these negative results, the physician decides that the normal enzyme levels are secondary to extensive pancreatic acinar cell destruction from prior attacks. No further diagnostic imaging is ordered, and the patient is admitted to the medical ward with a diagnosis of acute pancreatitis. The following morning, the patient develops a rigid, board-like abdomen, and an upright chest radiograph demonstrates pneumoperitoneum, indicating a perforated peptic ulcer. The physician's specific act of rationalizing the normal pancreatic enzyme levels to fit the initial diagnostic impression best illustrates which of the following cognitive errors?

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

Cevap

Confirmation bias
The correct answer is confirmation bias. Confirmation bias occurs when a clinician selectively interprets, rationalizes, or remembers information in a way that confirms their pre-existing hypotheses, while dismissing or twisting contradictory evidence. In this scenario, the physician rationalizes the negative lipase and amylase results as 'acinar cell burnout' rather than correctly viewing them as evidence against the diagnosis of acute pancreatitis. This flawed interpretation allowed the physician to maintain their initial diagnostic belief, ultimately delaying the diagnosis of a perforated peptic ulcer.

Adım Adım Çözüm

1
Analyze the clinical vignette to identify the cognitive error being described.
The physician encounters objective laboratory data (normal lipase and amylase) that contradicts the initial hypothesis of acute pancreatitis.
Understanding the clinical sequence is necessary to pinpoint where the diagnostic reasoning failed.
2
Evaluate how the physician processes the contradictory information.
Instead of using the normal laboratory values to broaden the differential diagnosis, the physician rationalizes the data (attributing it to acinar cell burnout) to make it fit the pre-existing diagnosis.
The specific mishandling of evidence is the key to identifying the exact cognitive bias.
3
Differentiate between the available cognitive bias options based on the physician's behavior.
The act of interpreting new evidence in a way that supports existing beliefs, while dismissing or twisting contradictory data, is the definition of confirmation bias.
Distinguishing confirmation bias from anchoring or premature closure ensures the correct specific etiology of the medical error is identified.

Anahtar Kavram

Confirmation bias involves selectively interpreting or rationalizing new clinical data to support a pre-existing diagnostic hypothesis, often leading to missed or delayed alternative diagnoses.
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Human Factors and Cognitive Biases

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