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Difficulty: HardClassification of Medical Errors and Adverse Events

A 68-year-old man with a history of hypertension, hyperlipidemia, and a previous transient ischemic attack is admitted to the hospital for an elective right total knee arthroplasty. His preoperative workup is unremarkable. The surgery proceeds smoothly, and he is transferred to the orthopedic ward. In accordance with the hospital's evidence-based venous thromboembolism prophylaxis protocol, he is prescribed subcutaneous enoxaparin and sequential compression devices. The electronic health record confirms that all doses of enoxaparin are administered on schedule and the compression devices are actively functioning. On postoperative day 4, the patient experiences sudden-onset dyspnea, tachycardia, and right-sided pleuritic chest pain. A CT pulmonary angiogram confirms a segmental pulmonary embolism. The patient is immediately started on a therapeutic dose of intravenous unfractionated heparin, and his symptoms gradually improve. An internal quality review of the case concludes that all prophylactic measures and clinical guidelines were adhered to flawlessly by the surgical and nursing teams.

Which of the following terms best classifies the patient's development of a pulmonary embolism in this scenario?

  1. Unpreventable adverse eventAnswer
  2. B
    Preventable adverse event
  3. C
    Active medical error
  4. D
    Latent system failure
  5. E
    Near miss

Answer

The development of a pulmonary embolism in this patient is best classified as an unpreventable adverse event.
The correct answer is unpreventable adverse event. In patient safety terminology, an adverse event is defined as an injury caused by medical management rather than the underlying condition of the patient. Adverse events are further subclassified as preventable or unpreventable. A preventable adverse event occurs due to a medical error or failure to follow the standard of care. An unpreventable adverse event occurs despite flawless adherence to the standard of care. In this scenario, the patient developed a pulmonary embolism, which is a known, intrinsic risk of major orthopedic surgery. Because the clinical team strictly followed the hospital's evidence-based venous thromboembolism prophylaxis protocol (both pharmacologic and mechanical), no medical error occurred. Therefore, the injury is classified as an unpreventable adverse event.

Step-by-Step Solution

1
Determine if the patient experienced an injury resulting from medical management or procedures.
The patient developed a pulmonary embolism, which is a known complication of major orthopedic surgery and the perioperative state, classifying it as an adverse event.
Differentiating an adverse event from the natural progression of an underlying disease is the first step in patient safety event classification.
2
Evaluate whether the standard of care was met during the medical management.
The internal review confirmed that all evidence-based prophylactic measures (enoxaparin and sequential compression devices) were adhered to flawlessly.
Assessing adherence to guidelines determines if the adverse event was preventable (due to an error) or unpreventable (due to intrinsic risk).
3
Classify the event based on the findings from the previous steps.
Because the adverse event occurred despite perfect adherence to the standard of care, it is an unpreventable adverse event.
An event cannot be classified as a preventable adverse event, an active error, or a latent failure if no error or system defect occurred.

Key Concept

An unpreventable adverse event is an injury caused by medical management (not the underlying disease) that occurs despite flawless adherence to the standard of care and evidence-based guidelines.
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Topics

Classification of Medical Errors and Adverse Events

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