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Difficulty: MediumHuman Factors and Cognitive Biases

A quality improvement committee reviews the case of a 68-year-old man admitted to the intensive care unit (ICU) following an elective bowel resection. During the handoff, the surgical resident informs the covering ICU physician that the patient is "doing great, just dealing with some expected fluid shifts and incisional pain."

Over the next 6 hours, the patient develops progressive tachycardia and hypotension. The ICU physician attributes these vital sign changes to postoperative pain and hypovolemia, ordering intravenous fluids and opioid analgesics. Although the patient's symptoms do not improve, the physician does not expand the differential diagnosis to include anastomotic leak or intra-abdominal hemorrhage. Furthermore, when a nurse points out a newly resulted, unexplained drop in hemoglobin, the physician dismisses it as a "dilutional effect from the IV fluids" rather than investigating further.

Which of the following cognitive errors are explicitly demonstrated by the ICU physician in this scenario? (Select all that apply)

  1. Anchoring bias, by relying too heavily on the surgical resident's initial benign assessment of the patient's condition.Answer
  2. Confirmation bias, by interpreting the drop in hemoglobin as a dilutional effect to support the existing assumption of fluid shifts.Answer
  3. Premature closure, by stopping the diagnostic process and failing to consider other high-morbidity causes for the patient's instability.Answer
  4. D
    Availability heuristic, by basing the diagnosis on easily recalled, recent cases of postoperative hypovolemia encountered in the unit.
  5. E
    Framing effect, by altering the management plan based on whether the surgical risk was presented as a survival rate rather than a mortality rate.

Answer

The correct cognitive errors demonstrated are anchoring bias, confirmation bias, and premature closure.
The scenario illustrates three distinct cognitive errors. First, anchoring bias occurs because the physician is anchored by the resident's benign sign-out. Second, confirmation bias is evident when the physician rationalizes the dropping hemoglobin as dilutional, forcing the data to fit their assumed hypovolemia theory. Finally, premature closure happens when the physician stops considering other life-threatening diagnoses (like intra-abdominal hemorrhage) once pain and hypovolemia are assumed.

Step-by-Step Solution

1
Analyze the physician's reaction to the initial patient handoff.
The physician fixes their understanding on the surgical resident's assessment that the patient is 'doing great'.
This demonstrates anchoring bias, where initial information disproportionately influences subsequent judgment.
2
Evaluate the physician's handling of the drop in hemoglobin.
The physician dismisses the abnormal lab result as a 'dilutional effect' rather than investigating bleeding.
This demonstrates confirmation bias, as the physician selectively interprets data to support their existing theory of simple fluid shifts.
3
Assess the breadth of the physician's differential diagnosis.
The physician fails to consider other severe postoperative complications like hemorrhage or anastomotic leak.
This demonstrates premature closure, as the diagnostic process was halted too early after adopting a benign explanation.

Key Concept

Identifying multiple interacting cognitive biases (anchoring, confirmation, premature closure) that frequently contribute to diagnostic errors in critical care settings.
Estimated Time:1m 30s
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Topics

Human Factors and Cognitive Biases

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