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Difficulty: MediumClassification of Medical Errors and Adverse Events

A 58-year-old man undergoes an uncomplicated elective inguinal hernia repair. During discharge planning, the surgical resident prescribes oral hydromorphone for pain management using the hospital's new computerized provider order entry (CPOE) system. Due to a recent software update, the CPOE system's default frequency for hydromorphone was inadvertently changed from "every 4 hours as needed" to "every 1 hour as needed." The resident selects the medication and signs the order without reviewing the auto-populated frequency. The outpatient pharmacy software does not have a maximum daily dose alert, and the pharmacist dispenses the medication as written without contacting the prescriber. The patient takes the medication every hour at home, subsequently developing severe respiratory depression that requires emergency department admission and naloxone administration. Based on the classification of medical errors, which of the following elements in this scenario represent latent errors? (Select all that apply)

  1. The CPOE software update inadvertently changing the default dosing frequencyAnswer
  2. B
    The surgical resident signing the prescription without reviewing the auto-populated fields
  3. The absence of a maximum daily dose alert in the pharmacy dispensing softwareAnswer
  4. D
    The dispensing pharmacist failing to contact the prescriber to clarify the unusual frequency
  5. E
    The development of opioid-induced respiratory depression requiring emergency intervention

Answer

The elements representing latent errors are the CPOE software update inadvertently changing the default dosing frequency and the absence of a maximum daily dose alert in the pharmacy dispensing software.
In the Swiss cheese model of medical errors, latent errors refer to vulnerabilities, design flaws, or organizational failures embedded within the healthcare system (the 'blunt end'). They do not directly cause harm on their own but create the necessary conditions for frontline active errors to reach the patient. In this scenario, the CPOE software update that altered the default dosing frequency and the lack of a maximum daily dose alert in the pharmacy software are both systemic, structural flaws. These latent conditions paved the way for the frontline providers (resident and pharmacist) to make active errors.

Step-by-Step Solution

1
Differentiate between active errors and latent errors.
Active errors occur at the 'sharp end' (frontline personnel directly involved in patient care), while latent errors occur at the 'blunt end' (systemic vulnerabilities, organizational flaws, or technological design issues).
Accurate classification is required to identify the root causes embedded within the healthcare delivery system.
2
Evaluate each event in the scenario to determine its appropriate classification.
The software glitch and missing pharmacy alerts are system-level flaws (latent). The resident's oversight and pharmacist's failure to verify are frontline human failures (active). The respiratory depression is the resulting patient harm (adverse event).
Applying the definitions to the specific vignette actions isolates the latent systemic vulnerabilities from human error.

Key Concept

Latent errors are systemic vulnerabilities and design flaws (the 'blunt end' of patient care) that create conditions enabling frontline active errors to cause patient harm.
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Topics

Classification of Medical Errors and Adverse Events

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