Question

Difficulty: HardClassification of Medical Errors and Adverse Events

A 68-year-old man with a history of severe benign prostatic hyperplasia and recurrent urinary retention is admitted to the general medical floor for an acute exacerbation of chronic obstructive pulmonary disease. He is appropriately prescribed bronchodilators and systemic corticosteroids. On the first night of admission, the patient complains of severe insomnia. The cross-covering physician orders oral diphenhydramine as needed for sleep, overlooking the patient's history of benign prostatic hyperplasia. The hospital's electronic health record system does not generate an interaction warning because the patient's prostate diagnosis was documented only in free-text clinical notes from a previous admission and was never added to the standardized active problem list. The night nurse subsequently administers the diphenhydramine. Six hours later, the patient develops painful acute urinary retention, necessitating the urgent insertion of a Foley catheter. Which of the following provides the most accurate patient safety classification of the factors and outcomes in this clinical incident?

  1. The physician's prescribing choice is an active error, the electronic health record's inability to read free-text data is a latent error, and the clinical outcome is a preventable adverse event.Answer
  2. B
    The clinical outcome is an unpreventable adverse event because diphenhydramine is a standard-of-care sleep aid that lacks absolute pharmacologic contraindications in patients with pulmonary disease.
  3. C
    The incident is a near miss that primarily resulted from the physician's premature closure of the differential diagnosis when evaluating the patient's nighttime restlessness.
  4. D
    The incident constitutes a sentinel event driven by incorrect test sequencing, as a post-void residual bladder ultrasound was omitted prior to medication administration.
  5. E
    The nurse's administration of the medication represents a latent error resulting from the patient's inappropriate disposition to a general floor instead of a higher-acuity step-down unit.

Answer

The physician's prescribing choice is an active error, the electronic health record's inability to read free-text data is a latent error, and the clinical outcome is a preventable adverse event.
The correct classification properly identifies the three distinct components of patient safety terminology demonstrated in the vignette. The physician's mistake (prescribing an anticholinergic drug to a patient with benign prostatic hyperplasia) occurs at the frontline of care, representing an active error. The electronic health record's design flaw, which cannot parse free-text notes to trigger safety alerts, is an underlying system vulnerability, representing a latent error. Finally, because the contraindicated medication reached the patient and caused tangible harm (urinary retention requiring an invasive procedure), the outcome is a preventable adverse event. It is not a near miss (because harm occurred) and not a sentinel event (because the harm was not permanent or severely life-threatening).

Step-by-Step Solution

1
Evaluate the clinical outcome of the incident.
The patient developed acute urinary retention requiring a Foley catheter due to the administration of an anticholinergic medication.
Determining whether harm occurred and if it could have been avoided is required to classify the event as a preventable adverse event, unpreventable adverse event, near miss, or sentinel event.
2
Analyze the physician's action.
The physician prescribed a contraindicated medication at the point of care.
Actions taken by frontline operators (the 'sharp end' of medical care) that immediately lead to an incident are classified as active errors.
3
Analyze the electronic health record (EHR) system's role.
The EHR failed to generate a warning because the system design requires structured data, whereas the patient's history was in free text.
System-level vulnerabilities and design flaws (the 'blunt end' of medical care) that create conditions for errors to occur are classified as latent errors.

Key Concept

Classification of Medical Errors and Adverse Events
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