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Difficulty: MediumHuman Factors and Cognitive Biases

A 68-year-old woman is brought to the emergency department from a skilled nursing facility due to severe altered mental status. The facility's transfer paperwork prominently lists "acute urinary tract infection (UTI)" as the reason for transfer, based on a positive urine dipstick for leukocyte esterase performed earlier that day. The receiving emergency physician reads this paperwork, accepts UTI as the primary diagnosis, and immediately initiates intravenous fluids and broad-spectrum antibiotics. A subsequent comprehensive metabolic panel reveals a serum sodium level of 112112 mEq/L. Despite this profound hyponatremia being a classic and sufficient cause for the patient's severe neurologic presentation, the physician focuses the admission orders entirely on sepsis management and does not initiate appropriate sodium correction protocols. The physician's heavy reliance on the initial transfer diagnosis, leading to a failure to adequately adjust the clinical assessment and management plan when critical new objective data became available, is best described by which of the following cognitive errors?

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

Answer

Anchoring bias
The correct answer is anchoring bias. Anchoring bias (or anchoring heuristic) occurs when a clinician relies too heavily on the first piece of information obtained (the 'anchor') and fails to adequately adjust their diagnostic probability when new, even contradictory, information becomes available. In this scenario, the transfer paperwork identifying a 'UTI' served as a powerful anchor. Consequently, when the physician received the critical finding of profound hyponatremia—a classic and severe cause of altered mental status—they failed to adjust their clinical assessment and continued to manage the patient solely for the presumed infection.

Step-by-Step Solution

1
Analyze the clinical scenario to identify the primary cognitive error.
The physician is heavily influenced by the transfer paperwork (the 'anchor') and fails to adjust the diagnosis despite receiving a critical sodium level of 112 mEq/L.
Identifying the timeline of information gathering and how the initial impression affected subsequent decision-making is necessary to classify the bias.
2
Differentiate between the cognitive biases provided in the options.
Anchoring bias specifically fits the description of relying too heavily on an initial piece of information, leading to inadequate adjustments when contradictory or more relevant new data is presented.
Distinguishing anchoring from similar biases like premature closure and confirmation bias ensures the correct selection.

Key Concept

Identifying anchoring bias in diagnostic reasoning

Alternative Method

When evaluating cognitive errors, look for the 'trigger' event. If the diagnostic error stems from an inability to move past the very first piece of information presented (like triage notes or sign-out), it is highly likely to represent anchoring bias.
Estimated Time:1m 0s
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Topics

Human Factors and Cognitive Biases

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