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Difficulty: MediumClassification of Medical Errors and Adverse Events

A 54-year-old man presents to the hospital with a productive cough, fever, and shortness of breath. He has a history of a mechanical aortic valve replacement, for which he takes chronic warfarin therapy. He is diagnosed with community-acquired pneumonia and admitted to the general medical floor. The admitting physician orders intravenous levofloxacin but forgets to reduce the patient's warfarin dose, as levofloxacin is known to inhibit warfarin metabolism. The hospital's electronic health record (EHR) normally flags this critical drug-drug interaction; however, a recent software patch inadvertently disabled the safety alert for this specific medication class. The pharmacist verifies the order, assuming the EHR had screened for interactions, and the nurse administers both medications. Three days later, the patient's international normalized ratio (INR) is found to be 7.5, and he develops mild gingival bleeding. The bleeding resolves rapidly after withholding warfarin and administering oral vitamin K. The hospital safety committee determines that the disabled EHR alert was the fundamental reason this oversight reached the patient.

Which of the following terms best classifies the underlying electronic health record software patch failure in this scenario?

  1. Latent errorAnswer
  2. B
    Active error
  3. C
    Near miss
  4. D
    Sentinel event
  5. E
    Unpreventable adverse event

Answer

Latent error
The electronic health record software patch failure represents a latent error. In patient safety frameworks (such as James Reason's Swiss Cheese Model), latent errors are defined as 'blunt end' defects. These are inherent vulnerabilities, design flaws, or organizational defects that lie dormant within a system. Latent errors do not cause harm directly; rather, they create conditions that allow active human errors to bypass safety defenses and reach the patient. In this scenario, the software patch disabled the safety alert, creating a hazardous environment that permitted the physician's active error (prescribing interacting medications) and the pharmacist's active error (verifying without checking) to result in patient harm.

Step-by-Step Solution

1
Identify the primary adverse outcome and its causes in the vignette.
The patient experienced an adverse drug interaction leading to bleeding. Causes include the physician's prescribing mistake, the pharmacist's verification mistake, and the EHR software glitch.
Deconstructing the event into its contributing factors is necessary for accurate error classification.
2
Analyze the specific component asked about in the question (the EHR software patch failure).
The software patch failure is a system-level defect that occurred away from the direct point of patient care.
The question specifically asks to classify the software failure, not the human actions.
3
Match the defect to the correct patient safety terminology.
System-level vulnerabilities that lie dormant until they facilitate human errors are classified as latent errors.
This correctly applies the Swiss Cheese Model of accident causation to the scenario.

Key Concept

Classification of Medical Errors and Adverse Events (Latent vs. Active errors)
Estimated Time:1m 15s
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Topics

Classification of Medical Errors and Adverse Events

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