Patient Safety accounts for 18 scored items, and its ideas also show up in Quality Review and Leadership questions. The exam's point of view is consistent: harm usually comes from systems, not bad people, and the best fixes change the system.
How errors reach patients
James Reason's Swiss cheese model pictures each safeguard as a slice with holes: latent conditions like understaffing, confusing equipment or unclear policies. Harm happens when holes line up and a hazard passes through every layer.
The lesson for the exam: when an event happens, ask which layers failed and why, not just who made the last mistake.
High reliability principles
High reliability organizations operate in hazardous conditions with very few accidents. Weick and Sutcliffe describe five principles. Tap each for what it looks like in a hospital.
These five are listed in the order Weick and Sutcliffe present them; the numbers are for reference, not priority.
Just Culture
A Just Culture balances learning with accountability. The response depends on the behavior, never on the outcome.
| Behavior | What it is | Response |
|---|---|---|
| Human error | An inadvertent slip, lapse or mistake | Console; fix the system |
| At-risk behavior | A choice where risk isn't recognized or is believed justified; often a normalized shortcut | Coach; remove incentives for the shortcut |
| Reckless behavior | Conscious disregard of a substantial, unjustifiable risk | Remedial or disciplinary action |
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RCA vs. FMEA
| Root cause analysis | Failure mode and effects analysis | |
|---|---|---|
| Timing | Retrospective, after an event | Prospective, before harm occurs |
| Trigger | Sentinel or serious safety event, or a cluster of events | New or changed high-risk process |
| Core question | Why did this happen? | What could go wrong, and how bad would it be? |
| Output | Causal statements and an action plan | Prioritized failure modes and redesign |
Strong actions beat weak ones
The RCA2 guidance from the National Patient Safety Foundation ranks corrective actions by how reliably they prevent recurrence. Exam answers favor the strongest feasible option.
FMEA risk priority number
Each failure mode is scored for severity, likelihood of occurrence and likelihood of escaping detection, usually 1 to 10 each. Multiply for the RPN (maximum 1,000). Try a failure mode from a new infusion pump process:
Failure mode: nurse selects the wrong drug from the pump library.
For detection, 10 means the failure is almost impossible to catch before it reaches the patient. Action thresholds below are illustrative; organizations set their own.
Some organizations use a hazard scoring matrix (severity × probability) instead, such as the VA's Healthcare FMEA. The priority logic is the same.
Sentinel events and reporting
The Joint Commission defines a sentinel event as a patient safety event, not primarily related to the natural course of the illness, that results in death, permanent harm or severe temporary harm. These call for immediate investigation and a comprehensive systematic analysis, such as an RCA, with an action plan.
- Near misses never reach the patient, yet they're the cheapest lessons. A strong reporting culture captures them.
- Safety culture is often measured with AHRQ's Surveys on Patient Safety Culture (SOPS).
- Confidentiality of safety work products, including through Patient Safety Organizations, encourages open reporting.
Teamwork and human factors
Human factors engineering designs systems around how people actually think and work: standardizing, simplifying, using forcing functions and reducing reliance on memory. Teamwork tools from TeamSTEPPS appear often on the exam:
| Tool | Purpose |
|---|---|
| SBAR | Structured communication: Situation, Background, Assessment, Recommendation |
| Briefs, huddles, debriefs | Plan, adjust and learn as a team |
| Check-back / closed loop | Confirms a message was received and understood |
| CUS words | "I'm Concerned, I'm Uncomfortable, this is a Safety issue" to escalate |
| Two-challenge rule | Voice a concern at least twice to ensure it's heard |
After a wrong-site surgery, an RCA team finds the surgical site was marked inconsistently across operating rooms. Which corrective action is strongest?
A hard stop is a forcing function, one of the strongest actions because it doesn't depend on memory or vigilance. Education, signs and policy revisions are weaker actions that rely on people remembering to comply.
A hospital's incident reports dropped 40% after a new manager began publicly naming staff involved in errors. What is the most likely explanation?
A sudden drop in reports after a punitive change usually signals fear, not safety. Healthy safety cultures often see reporting increase, especially near misses. The fix is to restore a non-punitive, Just Culture approach.
Frequently asked questions
Root cause analysis is retrospective: it examines an event that already happened. FMEA is prospective: it looks for ways a process could fail before harm occurs.
Risk priority number = severity x occurrence x detection, each usually scored 1 to 10, for a maximum of 1,000. Higher numbers get attention first, though high severity alone should also trigger action.
Human error (console the person), at-risk behavior (coach the person) and reckless behavior (consider sanction). The response depends on the behavior, not the outcome.
The Joint Commission defines it as a patient safety event, not primarily related to the natural course of the illness, that results in death, permanent harm or severe temporary harm.
Figures are from NAHQ's 2024 CPHQ Detailed Content Outline (Revision 2b) and 2024 Domestic Candidate Handbook unless noted. Fees and policies change; the current handbook on nahq.org is the controlling source.