Patient safety, human factors & CRM

Overview & definition

The patient safety science is the study and the prevention of the iatrogenic harm. The healthcare is the high-risk, the complex, the team-based activity where the errors are common and the harm significant — the anaesthesia historically among the riskier. The modern safety science, adapted from the high-reliability industries (the aviation, the nuclear), reframes the harm as the consequence of the system failures (the latent conditions) that align to defeat the defences, not the individual's failing. The anaesthetist — the leader of the perioperative team, the manager of the crises — is the central figure in the perioperative safety, and the mastery of the human factors, the CRM, and the safety tools is the modern competency.[2][3]

The systems approach — the Swiss cheese model

The Swiss cheese model (Reason) pictures the system as the multiple layers of the defence (the slices of the cheese), each with the holes (the local failures). The harm occurs when the holes in the successive layers align — the trajectory of the accident. The failures are the active (the sharp end — the clinician's slip, the lapse, the mistake) and the latent (the blunt end — the poor design, the understaffing, the time pressure, the inadequate training, the production pressure). The systems approach seeks the latent conditions (the removable alignment of the holes), not the blame of the active-error individual. The just culture — the fair distinction between the human error, the at-risk behaviour, and the reckless behaviour — is the foundation.[2][3]

The human factors

The human factors (the ergonomics) is the fit between the human and the work — the cognitive, the physical, and the organisational. The factors that degrade the performance:[3]

• The cognitive. The attention, the working memory, the cognitive load, the vigilance, the fatigue, the stress, the distraction, the interruption. The anaesthetist monitors the multiple streams simultaneously (the patient, the monitors, the surgeon, the team), and the cognitive overload degrades the performance.
• The physical. The fatigue, the sleep deprivation, the hunger, the noise, the lighting, the equipment, the posture, the long hours. The sleep-deprived and the fatigued anaesthetist performs like the alcohol-impaired.
• The organisational. The production pressure (the throughput over the safety), the staffing, the supervision, the culture, the communication, the hierarchy. [1]

The recognition of the human limitations (the working-memory constraints, the vigilance decrement) and the design that compensates (the standardisation, the checklists, the redundancy, the forcing functions) is the human-factors approach.[3]

The fatigue and the performance

The sleep deprivation and the circadian disruption degrade the vigilance, the reaction time, the judgement, and the mood. The performance after the 17 to 19 hours awake is comparable to the blood alcohol of 0.05 to 0.1 per cent. The fatigue impairs the clinical judgement and increases the error rate. The mitigation: the rest, the naps, the workload management, the circadian-aware scheduling, the awareness of the personal fatigue state. The fatigue is a systems issue (the rota design) as much as the personal one.[3]

The crisis resource management

The crisis resource management (the CRM) is the set of the non-technical skills for the crisis: the leadership, the communication, the situational awareness, the task management, the resource utilisation, the team coordination. Adapted from the aviation crew resource management, the CRM is the determinant of the crisis outcome as much as the technical skill. The ANA and the APSO have adapted it for the anaesthetic and the perioperative crises (the ANTS — the Anaesthetists' Non-Technical Skills — and the NOTSS for the surgeons).[2]

The CRM principles: (1) the leadership — the designated leader, the clear role, the allocation of the tasks, the final decision. (2) the communication — the closed-loop (the read-back) communication, the SBAR (the Situation, the Background, the Assessment, the Recommendation), the clear and the brief. (3) the situational awareness — the perception of the elements, the comprehension of the meaning, the projection of the future (the three levels); the loss of the situational awareness is the common precursor of the crisis failure. (4) the task management — the prioritisation, the parallel tasking, the anticipation. (5) the resource utilisation — the people (the call for the help), the equipment, the time. (6) the team coordination — the shared mental model, the role clarity, the mutual support, the debriefing.[2]

The WHO surgical safety checklist

The WHO surgical safety checklist (the 19-item tool, the sign-in, the time-out, the sign-out) is the highest-profile perioperative safety intervention, reducing the mortality and the morbidity in the global studies. The checklist forces the team to confirm the patient identity, the procedure, the site, the consent, the allergies, the airway and the aspiration risk, the blood loss, the equipment, the antibiotics, the imaging, and the team introductions, and to review the concerns and the recovery plan.[1][6] The checklist works when it is the genuine team engagement (not the box-ticking), the full participation, and the culture that welcomes the raising of the concerns by any team member. The narrative review of the checklist implementation summarises the evidence and the challenges.[1]

The time-out and the surgical site marking

The time-out (the pause before the incision) and the surgical site marking are the specific tools to prevent the wrong-site, the wrong-procedure, and the wrong-patient surgery (the Never Events). The time-out confirms the patient, the procedure, the site, the consent, the positioning, the imaging, and the antibiotics. The site marking (the surgeon's mark at or near the site) confirms the side and the level. The optimisation and the prevention of the error in the site identification (the standardised protocol, the verification at the multiple steps) is the evidence-based prevention.[6][7]

The Never Events and the sentinel events

The Never Events (the wrong-site, the wrong-procedure, the wrong-patient surgery, the retained foreign object, the wrong implant, the medication error in the high-alert drug, the unsupported patient fall) are the preventable, the serious incidents that signal the gross systems failure. The sentinel events (the unexpected occurrence involving the death, the serious harm, or the risk thereof) trigger the mandatory investigation, the root-cause analysis, the system redesign, and the reporting.[6][7]

The medication safety

The medication error is the commonest anaesthetic incident (the wrong drug, the wrong dose, the wrong concentration, the wrong route, the wrong patient, the omission). The prevention: the labelled syringes (the standardised colour, the drug, the concentration), the read-back of the drug and the dose, the double-check of the high-alert drugs, the standardised concentrations, the smart pumps, the bar-coding, and the reporting of the near-misses. The drug-error reporting and the learning culture are the foundation.[3]

The non-technical skills — the ANTS

The Anaesthetists' Non-Technical Skills (the ANTS) is the validated framework for the assessment and the training of the anaesthetist's non-technical performance: the task management, the team working, the situation awareness, and the decision making. The ANTS and the NOTSS (the surgeons) provide the structured language and the assessment for the non-technical skills, taught and the assessed in the simulation and the practice. The non-technical skills are the trainable, the measurable component of the safe practice.[2][8]

The simulation and the training

The high-fidelity simulation is the powerful tool for the CRM and the non-technical skills training, the rare-event rehearsal (the malignant hyperthermia, the can't-intubate-can't-oxygenate, the cardiac arrest), and the team training. The simulation allows the safe exposure to the crisis, the structured debriefing, and the learning without the patient harm. The DAS 2025 airway guidelines education package exemplifies the bridging of the translation gap (the guideline to the practice) through the structured education and the simulation.[5][8]

The critical incident analysis and the learning

The critical incident reporting (the voluntary, the non-punitive, the anonymised) and the analysis (the root-cause, the systems) drive the learning and the improvement. The just culture (the fair, the learning-not-blame) encourages the reporting. The audit, the morbidity-and-mortality meetings, and the feedback close the loop. The learning organisation — that captures the incidents, the analyses, the system redesign, and the verification of the change — is the mature safety culture.[3]

The second victim and the staff wellbeing

The clinician involved in the patient harm (the error, the adverse outcome, the death) is the "second victim" — the psychological trauma, the self-doubt, the isolation, the burnout. The international validation of the surgeons' stress after the mortality confirms the universal nature of the phenomenon.[4] The support (the peer support, the counselling, the time out, the just-culture treatment, the mentorship) is essential for the recovery and the retention. The occupational stress in the anaesthetists (the fatigue, the burnout, the moral distress) is a recognised patient-safety issue — the impaired clinician is the unsafe clinician.[3][4]

The culture of safety

The safety culture is the shared values, the attitudes, and the behaviours that prioritise the safety. The components: the just culture (the fair, the learning), the reporting culture (the voluntary, the non-punitive), the learning culture (the analysis, the change), the informed culture (the data-driven), and the flexible culture (the adaptable). The leadership, the psychological safety (the freedom to speak up), and the team training build the culture. The culture is the foundation that the tools (the checklists, the CRM) require to work.[2][3]

The quality improvement

The quality improvement (the QI) is the systematic, the data-driven effort to improve the care. The methods (the PDSA cycle, the Lean, the Six Sigma, the statistical process control) and the measures (the structure, the process, the outcome) are the tools. The anaesthetist's role in the QI (the audit, the protocol design, the implementation, the measurement) is the active patient-safety practice. The QI is the continuous, the team-based effort.[1][6]

[1] [1]

Red flags

[1] [1] [1] [1] [1]

References

1. [1]Younis Z, et al. Implementation of Surgical Safety Checklists in Orthopaedic Surgery: A Narrative Review of Compliance, Barriers, and Future Improvements Cureus, 2025.PMID 41541994
2. [2]Wen L, et al. Crisis resource management in nonoperating room anesthesia Curr Opin Anaesthesiol, 2026.PMID 42228455
3. [3]Paterson E, et al. Occupational stress in anaesthetists: a narrative review of psychosocial risk management using a human factors systems approach Br J Anaesth, 2026.PMID 42156312
4. [4]Morato O, et al. Surgeons' stress assessment after surgical mortality: first international validated survey (STRESSURG study) Langenbecks Arch Surg, 2026.PMID 42265303
5. [5]Madden M, et al. The Difficult Airway Society 2025 Guidelines Education Package: bridging the translational gap Br J Anaesth, 2026.PMID 41956869
6. [6]Hershfeld B, et al. Optimizing Surgical Time-outs in Orthopaedic Surgery: History, Challenges, and Strategies for Improvement J Patient Saf, 2026.PMID 42241582
7. [7]McTighe SP, et al. Optimization and Prevention of Error in Surgical Site Identification Dermatol Surg, 2026.PMID 42337803
8. [8]Boldis AM, et al. High-fidelity simulation programs in ICU-related ethical non-technical skills training: A narrative review J Crit Care Med (Targu Mures), 2026.PMID 42153104