Quality Improvement, Patient Safety & Incident Analysis

Also known as Quality improvement · QI · Patient safety · Incident analysis · Root cause analysis · RCA · PDSA cycle · Model for Improvement · Lean · Six Sigma · DMAIC · Checklist · Care bundle · Sentinel event · Never event · CLABSI · VAP · CAUTI · Just culture · Swiss cheese model · Daily goals · Rapid response team · Standardised mortality ratio · Ventilator day · Handover

Quality improvement (QI), patient safety, and incident analysis in the ICU. QI methods: the Model for Improvement, the PDSA cycle (plan-do-study-act), Lean (waste removal, value-stream), Six Sigma (defect reduction, DMAIC), root cause analysis (RCA), fishbone/Ishikawa, the 5 Whys, audit and feedback, the Triple Aim, and statistical process control (run/control charts). Patient safety in ICU: types of error (medication, procedural, diagnostic, handover/communication), healthcare-associated infections (CLABSI, VAP, CAUTI), pressure injuries, falls, unplanned extubation. Safety culture: the just culture (Marx), blame-free/near-miss reporting, the Swiss cheese model (Reason), incident reporting systems, the Global Trigger Tool. Checklists and bundl…

high26 referencesUpdated 26 July 202619 min readVerification in progress

Practise this topic

8 MCQs

The one-paragraph exam answer

Quality improvement closes the evidence-practice gap; patient safety prevents avoidable harm. The systems approach (Reason) holds that errors are consequences of latent system conditions, not primarily individual failures — defend in depth with the Swiss cheese model, then choose your method to the problem: the Model for Improvement (three questions plus the PDSA cycle, run small and fast), Lean (remove the eight wastes), Six Sigma (reduce variation via DMAIC), audit and feedback, and statistical process control (never react to a single data point). After a harm, run a root cause analysis using the London Protocol and the fishbone, target latent conditions with the highest countermeasure in the hierarchy (force function beats education), and apply the just culture (manage human error, coach at-risk behaviour, sanction recklessness). The landmark proof that safety is engineered, not exhorted: the Michigan central line bundle cut CLABSI by roughly two-thirds and held it for a decade.^[1]

Meet the patient

At 2 am a registrar three weeks into the term programmes an insulin infusion at ten times the intended rate for a septic patient who is hyperglycaemic. The error is not caught until the early-morning blood gas shows profound hypoglycaemia. The patient has a brief hypoglycaemic seizure, is resuscitated with intravenous dextrose, and recovers without sequelae — tenfold medication errors of exactly this shape are a well-described, significant source of medication risk. The consultant on call is asking how you, as director, will respond.^[24]

The two questions that decide this case are the two that decide every incident: was this a person failure or a system failure? and what is the strongest countermeasure that stops it happening again? The first answer is almost always "system" — and the second is almost never "be more careful." Hold those two and the rest of this topic slots into place.^[1]

References26Show

[1]Reason J Human error: models and management BMJ, 2000.PMID 10720363
[2]Reason J James Reason: patient safety, human error, and Swiss cheese. Interview by Karolina Peltomaa and Duncan Neuhauser Qual Manag Health Care, 2012.PMID 22207020
[3]Vincent C, Irving D, Bellandi T, et al. Systems analysis of clinical incidents: development of a new edition of the London Protocol BMJ Qual Saf, 2025.PMID 39986680
[4]Pronovost P, Needham D, Berenholtz S, et al. An intervention to decrease catheter-related bloodstream infections in the ICU N Engl J Med, 2006.PMID 17192537
[5]Pronovost PJ, Watson SR, Goeschel CA, et al. Sustaining Reductions in Central Line-Associated Bloodstream Infections in Michigan Intensive Care Units: A 10-Year Analysis Am J Med Qual, 2016.PMID 25609646
[6]Pronovost PJ, Marsteller JA, Goeschel CA Preventing bloodstream infections: a measurable national success story in quality improvement Health Aff (Millwood), 2011.PMID 21471482
[7]Haynes AB, Weiser TG, Berry WR, et al. A surgical safety checklist to reduce morbidity and mortality in a global population N Engl J Med, 2009.PMID 19144931
[8]Berenholtz SM, Lubomski LH, Weeks K, et al. Eliminating central line-associated bloodstream infections: a national patient safety imperative Infect Control Hosp Epidemiol, 2014.PMID 24334799
[9]O'Grady NP, Alexander M, Dellinger EP, et al. Guidelines for the prevention of intravascular catheter-related infections. Centers for Disease Control and Prevention MMWR Recomm Rep, 2002.PMID 12233868
[10]Lo E, Nicolle LE, Coffin SE, et al. Strategies to prevent catheter-associated urinary tract infections in acute care hospitals Infect Control Hosp Epidemiol, 2008.PMID 18840088
[11]Starmer AJ, Spector ND, Srivastava R, et al. Changes in medical errors after implementation of a handoff program N Engl J Med, 2014.PMID 25372088
[12]Needham DM, Korupolu R, Zanni JM, et al. Early physical medicine and rehabilitation for patients with acute respiratory failure: a quality improvement project Arch Phys Med Rehabil, 2010.PMID 20382284
[13]Devlin JW, Skrobik Y, Gélinas C, et al. Clinical Practice Guidelines for the Prevention and Management of Pain, Agitation/Sedation, Delirium, Immobility, and Sleep Disruption in Adult Patients in the ICU Crit Care Med, 2018.PMID 30113379
[14]Ivers N, Yogasingam S, Lacroix M, et al. Audit and feedback: effects on professional practice Cochrane Database Syst Rev, 2026.PMID 42325158
[15]Berwick DM Disseminating innovations in health care JAMA, 2003.PMID 12697800
[16]Classen DC, Resar R, Griffin F, et al. 'Global trigger tool' shows that adverse events in hospitals may be ten times greater than previously measured Health Aff (Millwood), 2011.PMID 21471476
[17]Makary MA, Daniel M Medical error-the third leading cause of death in the US BMJ, 2016.PMID 27143499
[18]Landrigan CP, Parry GJ, Bones CB, Hackbarth AD, Goldmann DA, Sharek PJ Temporal trends in rates of patient harm resulting from medical care N Engl J Med, 2010.PMID 21105794
[19]Levy MM, Rhodes A, Phillips GS, et al. Surviving Sepsis Campaign: association between performance metrics and outcomes in a 7.5-year study Crit Care Med, 2015.PMID 25275252
[20]Leape LL Who's to blame? Jt Comm J Qual Patient Saf, 2010.PMID 20402371
[21]Bates DW, Cohen M, Leape LL, Overhage JM, Shabot MM, Sheridan T Reducing the frequency of errors in medicine using information technology J Am Med Inform Assoc, 2001.PMID 11418536
[22]Poon EG, Cina JL, Churchill W, et al. Medication dispensing errors and potential adverse drug events before and after implementing bar code technology in the pharmacy Ann Intern Med, 2006.PMID 16983130
[23]Costa DK, White MR, Ginier E, et al. Identifying Barriers to Delivering the Awakening and Breathing Coordination, Delirium, and Early Exercise/Mobility Bundle to Minimize Adverse Outcomes for Mechanically Ventilated Patients: A Systematic Review Chest, 2017.PMID 28438605
[24]Doherty C, Mc Donnell C Tenfold medication errors: 5 years' experience at a university-affiliated pediatric hospital Pediatrics, 2012.PMID 22473367
[25]Scott SD, Hirschinger LE, Cox KR, et al. The natural history of recovery for the healthcare provider "second victim" after adverse patient events Qual Saf Health Care, 2009.PMID 19812092
[26]Hughes K, Cole M, Tims D Optimizing the Use of Dose Error Reduction Software on Intravenous Infusion Pumps Hosp Pediatr, 2024.PMID 38716570

Quality Improvement, Patient Safety & Incident Analysis

high26 referencesUpdated 26 July 202619 min readVerification in progress

Practise this topic

8 MCQs

Meet the patient

References26Show

[1]Reason J Human error: models and management BMJ, 2000.PMID 10720363
[2]Reason J James Reason: patient safety, human error, and Swiss cheese. Interview by Karolina Peltomaa and Duncan Neuhauser Qual Manag Health Care, 2012.PMID 22207020
[3]Vincent C, Irving D, Bellandi T, et al. Systems analysis of clinical incidents: development of a new edition of the London Protocol BMJ Qual Saf, 2025.PMID 39986680
[4]Pronovost P, Needham D, Berenholtz S, et al. An intervention to decrease catheter-related bloodstream infections in the ICU N Engl J Med, 2006.PMID 17192537
[5]Pronovost PJ, Watson SR, Goeschel CA, et al. Sustaining Reductions in Central Line-Associated Bloodstream Infections in Michigan Intensive Care Units: A 10-Year Analysis Am J Med Qual, 2016.PMID 25609646
[6]Pronovost PJ, Marsteller JA, Goeschel CA Preventing bloodstream infections: a measurable national success story in quality improvement Health Aff (Millwood), 2011.PMID 21471482
[7]Haynes AB, Weiser TG, Berry WR, et al. A surgical safety checklist to reduce morbidity and mortality in a global population N Engl J Med, 2009.PMID 19144931
[8]Berenholtz SM, Lubomski LH, Weeks K, et al. Eliminating central line-associated bloodstream infections: a national patient safety imperative Infect Control Hosp Epidemiol, 2014.PMID 24334799
[9]O'Grady NP, Alexander M, Dellinger EP, et al. Guidelines for the prevention of intravascular catheter-related infections. Centers for Disease Control and Prevention MMWR Recomm Rep, 2002.PMID 12233868
[10]Lo E, Nicolle LE, Coffin SE, et al. Strategies to prevent catheter-associated urinary tract infections in acute care hospitals Infect Control Hosp Epidemiol, 2008.PMID 18840088
[11]Starmer AJ, Spector ND, Srivastava R, et al. Changes in medical errors after implementation of a handoff program N Engl J Med, 2014.PMID 25372088
[12]Needham DM, Korupolu R, Zanni JM, et al. Early physical medicine and rehabilitation for patients with acute respiratory failure: a quality improvement project Arch Phys Med Rehabil, 2010.PMID 20382284
[13]Devlin JW, Skrobik Y, Gélinas C, et al. Clinical Practice Guidelines for the Prevention and Management of Pain, Agitation/Sedation, Delirium, Immobility, and Sleep Disruption in Adult Patients in the ICU Crit Care Med, 2018.PMID 30113379
[14]Ivers N, Yogasingam S, Lacroix M, et al. Audit and feedback: effects on professional practice Cochrane Database Syst Rev, 2026.PMID 42325158
[15]Berwick DM Disseminating innovations in health care JAMA, 2003.PMID 12697800
[16]Classen DC, Resar R, Griffin F, et al. 'Global trigger tool' shows that adverse events in hospitals may be ten times greater than previously measured Health Aff (Millwood), 2011.PMID 21471476
[17]Makary MA, Daniel M Medical error-the third leading cause of death in the US BMJ, 2016.PMID 27143499
[18]Landrigan CP, Parry GJ, Bones CB, Hackbarth AD, Goldmann DA, Sharek PJ Temporal trends in rates of patient harm resulting from medical care N Engl J Med, 2010.PMID 21105794
[19]Levy MM, Rhodes A, Phillips GS, et al. Surviving Sepsis Campaign: association between performance metrics and outcomes in a 7.5-year study Crit Care Med, 2015.PMID 25275252
[20]Leape LL Who's to blame? Jt Comm J Qual Patient Saf, 2010.PMID 20402371
[21]Bates DW, Cohen M, Leape LL, Overhage JM, Shabot MM, Sheridan T Reducing the frequency of errors in medicine using information technology J Am Med Inform Assoc, 2001.PMID 11418536
[22]Poon EG, Cina JL, Churchill W, et al. Medication dispensing errors and potential adverse drug events before and after implementing bar code technology in the pharmacy Ann Intern Med, 2006.PMID 16983130
[23]Costa DK, White MR, Ginier E, et al. Identifying Barriers to Delivering the Awakening and Breathing Coordination, Delirium, and Early Exercise/Mobility Bundle to Minimize Adverse Outcomes for Mechanically Ventilated Patients: A Systematic Review Chest, 2017.PMID 28438605
[24]Doherty C, Mc Donnell C Tenfold medication errors: 5 years' experience at a university-affiliated pediatric hospital Pediatrics, 2012.PMID 22473367
[25]Scott SD, Hirschinger LE, Cox KR, et al. The natural history of recovery for the healthcare provider "second victim" after adverse patient events Qual Saf Health Care, 2009.PMID 19812092
[26]Hughes K, Cole M, Tims D Optimizing the Use of Dose Error Reduction Software on Intravenous Infusion Pumps Hosp Pediatr, 2024.PMID 38716570