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Zorluk: ZorHuman Factors and Cognitive Biases

During a night shift on the surgical ward, an on-call physician is asked to evaluate a patient on postoperative day 2 following an open hemicolectomy. The bedside nurse reports that the patient has developed sudden-onset dyspnea, hypoxemia, and tachycardia. Over the preceding five days, this same physician has been involved in the emergent resuscitation and intensive care transfer of three different patients who suffered massive, life-threatening pulmonary embolisms on this specific ward. Upon evaluating the new patient, the physician immediately orders a computed tomography pulmonary angiogram and initiates a therapeutic heparin infusion without performing a comprehensive physical examination or considering other etiologies. The imaging study ultimately shows no evidence of a pulmonary embolism. Subsequent thorough evaluation reveals diminished breath sounds at the lung bases, and a portable chest radiograph confirms substantial bibasilar atelectasis as the underlying cause of the patient's symptoms. Which of the following cognitive phenomena best explains the physician's initial diagnostic and management approach?

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

Cevap

The correct answer is the availability heuristic, which caused the physician to jump to a diagnosis of pulmonary embolism due to recent exposure to similar cases.
The scenario perfectly describes the availability heuristic. The physician recently managed three severe cases of pulmonary embolism (PE). Because these events were recent, frequent, and emotionally impactful (requiring emergent resuscitation and ICU transfer), they are highly 'available' in the physician's memory. When confronted with a new patient exhibiting non-specific respiratory symptoms (dyspnea, hypoxemia, tachycardia), the physician overestimates the probability of PE and prematurely commits to this diagnosis and its aggressive management, completely skipping the standard evaluation for more common and benign postoperative complications like atelectasis.

Adım Adım Çözüm

1
Analyze the physician's diagnostic behavior in the context of the clinical scenario.
The physician bypasses a standard workup for postoperative dyspnea and immediately treats for a pulmonary embolism.
Identifying the deviation from standard clinical reasoning helps isolate the underlying cognitive error.
2
Identify the contributing factors to the physician's decision-making process.
The stem explicitly notes the physician's recent, highly stressful involvement with three massive pulmonary embolisms on the same ward.
The context provided before the clinical error usually contains the specific trigger for the cognitive bias being tested.
3
Match the trigger and behavior to the correct cognitive phenomenon.
Basing a clinical judgment on the ease with which past examples come to mind defines the availability heuristic.
Distinguishing between similar biases (like anchoring vs. availability) requires matching the exact mechanism of the error to its psychological definition.

Anahtar Kavram

The availability heuristic is a cognitive bias where the perceived likelihood of an event is inappropriately inflated because examples are easily recalled, typically due to recent, frequent, or emotionally charged experiences.
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Human Factors and Cognitive Biases

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