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Sepsis

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-In-Chief: Priyamvada Singh, M.B.B.S. [2], Parth Vikram Singh, MBBS[3]

Synonyms and keywords: Sepsis syndrome; Septic shock; Septicemia; Septic infection, Septic shock syndrome; Sepsis shock syndrome; Septic shock syndrome; Sepsis spectrum syndrome

Overview

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-In-Chief: Priyamvada Singh, M.B.B.S. [2], Parth Vikram Singh, MBBS[3]

Synonyms and keywords: sepsis syndrome; septic shock; septicemia

Overview

Sepsis is a condition characterized by a whole-body inflammatory state caused by infection. Septic shock is a serious medical condition caused by decreased tissue perfusion and oxygen delivery as a result of infection and sepsis. It can cause multiple organ failure and death. Its most common victims are children, immunocompromised individuals, and the elderly. This is because their immune systems cannot cope with the infection as well as those of full-grown adults.[1]

Pathophysiology

The immunological response that causes sepsis is a systemic inflammatory response causing widespread activation of inflammation and coagulation pathways. This may progress to dysfunction of the circulatory system and, even under optimal treatment, may result in the multiple organ dysfunction syndrome and eventually death. A subclass of distributive shock, shock refers specifically to decreased tissue perfusion resulting in end-organ dysfunction. Dysregulated immune response remains the cornerstone of pathophysiology, involving both excessive inflammation and subsequent immunosuppression. Cytokines TNFα, IL-1β, interferon γ, IL-6 released in a large scale inflammatory response results in massive vasodilation, increased capillary permeability, decreased systemic vascular resistance, and hypotension. Hypotension reduces tissue perfusion pressure and thus tissue hypoxia ensues. Excessive inflammation is now recognized to include cytokine storm, formation of neutrophil extracellular traps (NETs), and emergency myelopoiesis. In parallel, an immunosuppressive phase develops, characterized by lymphopenia, expansion of MS1 monocytes, and T-cell exhaustion.

Recent work has also highlighted metabolic failure as a key contributor to immunoparalysis, with impaired glycolysis and oxidative phosphorylation in immune cells leading to inadequate host defense. Finally, in an attempt to offset decreased blood pressure, ventricular dilatation and myocardial dysfunction will occur.

Microvascular injury further amplifies tissue damage. Endothelial glycocalyx shedding leads to barrier loss, microvascular thrombosis, and inflammation, while complement overactivation exacerbates endothelial and organ injury.

Heterogeneity is increasingly recognized: gene expression and molecular profiling are uncovering distinct subtypes of sepsis with different immune signatures and therapeutic responses, such as macrophage activation–like syndrome.[2][3][4][5][6][7]

Classification

In rough order of severity, these are bacteremia or fungemia; septicemia; sepsis, severe sepsis or sepsis syndrome; septic shock; refractory septic shock; multiple organ dysfunction syndrome, and death.

Causes

The process of infection by bacteria or fungi can result in systemic signs and symptoms that are variously described. The condition develops as a response to certain microbial molecules which trigger the production and release of cellular mediators, such as tumor necrosis factors (TNF); these act to stimulate immune response.[8][9][10]

Differentiating Sepsis from other Diseases

Sepsis must be differentiated from other syndromes presnting with fever, hypotension such as the acute bacterial endocarditis, myocardial ring abscess, subacute bacterial endocarditis and bacterial meningitis.[11][12][13]

Epidemiology and Demographics

The hospitalization rate of those with a principal diagnosis of septicemia or sepsis more than doubled from 2000 through 2008. During the same period, the hospitalization rate for those with septicemia or sepsis as a principal or as a secondary diagnosis increased by 70% from 221 to 377 for every 100,000 people. Reasons for these increases may include an aging population with more chronic illnesses, greater use of invasive procedures, immunosuppressive drugs, chemotherapy, transplantation, and increasing microbial resistance to antibiotics.[14]

Globally, the burden of sepsis remains very high, with an estimated 48.9 million cases and 11 million deaths annually. Importantly, about 85% of these cases occur in low- and middle-income countries (LMICs), particularly in sub-Saharan Africa.[15]

Risk Factors

Factors responsible for increased risk of sepsis may include an aging population with more chronic illnesses; greater use of invasive procedures, immunosuppressive drugs, chemotherapy, and transplantation; and increasing microbial resistance to antibiotics. Other patients population at increased risk are ICU admits, immunocompromised, bacteremic, with community acquired pneumonia, and with genetic predisposition.[16][14][14]

Natural History, Complications and Prognosis

There are many complications associated with sepsis, especially because it is a systemic phenomenon. Sepsis is a severe condition, and the prognosis of the patient will depend greatly on the condition and overall health of the patient. Many factors, such as age, hosts immune response, site of infection, type of infection, appropriate antibiotic therapy, and restoration of circulation of perfusion contribute to the overall prognosis.[17][18] [19][20][21][22] [23]

Diagnosis

History and Symptoms

Symptoms of sepsis are often related to the underlying infectious process. When the infection crosses into the bloodstream the resulting symptoms of sepsis occur fever, chills, and rigors, confusion, anxiety, difficulty breathing, fatigue and malaise, nausea and vomiting.[24][25][1]

Physical Examination

The physical examination of sepsis shows findings of the causative system as well as some generalized features.[26][27]

Laboratory Findings

The international guideline committee for diagnosis of septic shock recommends obtaining appropriate cultures that may include at least two blood cultures, urine, cerebrospinal fluid, wounds, respiratory secretions, or other body fluid cultures before antimicrobial therapy is initiated. If such cultures do not cause significant delay in antibiotic administration, then other tests that may be done include blood gases, kidney function tests, platelet count, white blood cell count, blood differential, fibrin degradation products, and peripheral smear.[28][1]

Improved detection using molecular tools (e.g., plasma metagenomics) is increasing pathogen identification rates. Transcriptome- and proteome-based diagnostic tools have also been approved, though their clinical impact is still untested.[15]

Sepsis-3 remains the dominant definition for adults, whereas the Phoenix 2024 criteria are now recommended for pediatrics.[15]

Chest X Ray

There are no specific chest X-ray findings associated with sepsis but may show the features consistent with the primary source of infection.

CT

There are no specific CT findings associated with sepsis but may show the features consistent with the primary source of infection.

MRI

There are no specific MRI findings associated with sepsis but may show the features consistent with the primary source of infection.

Echocardiography or Ultrasound

There are no specific echocardiography or ultrasound finidngs associated with sepsis but may show the features consistent with the primary source of infection.

Treatment

Medical Therapy

According to IDSA, “Surviving Sepsis Campaign” guidelines, the management protocol for sepsis include screening for high-risk patients; taking bacterial cultures soon after the patient arrived at the hospital; starting patients on broad-spectrum intravenous antibiotic therapy before the results of the cultures are obtained; identifying the source of infection and taking steps to control it (e.g., abscess drainage); administering intravenous fluids to correct a loss or decrease in blood volume; and maintaining glycemic (blood sugar) control.[14][29][30][31][32][33][34][34][35][36][37][38][39]

Surgery

Surgical intervention is not recommended for the management of sepsis itself but may be essential as part of source control (e.g., abscess drainage, removal of infected devices).

Prevention

Prevent infections that can lead to sepsis by cleaning scrapes and wounds and getting regular vaccination against infections that cause sepsis can help in the prevention of sepsis.[40]

References

  1. 1.0 1.1 1.2 Karnatovskaia LV, Festic E (2012). “Sepsis: a review for the neurohospitalist”. Neurohospitalist. 2 (4): 144–53. doi:10.1177/1941874412453338. PMC 3726110. PMID 23983879.
  2. Minasyan H (2017). “Sepsis and septic shock: Pathogenesis and treatment perspectives”. J Crit Care. 40: 229–242. doi:10.1016/j.jcrc.2017.04.015. PMID 28448952.
  3. Pop-Began V, Păunescu V, Grigorean V, Pop-Began D, Popescu C (2014). “Molecular mechanisms in the pathogenesis of sepsis”. J Med Life. 7 Spec No. 2: 38–41. PMC 4391358. PMID 25870671.
  4. Stearns-Kurosawa DJ, Osuchowski MF, Valentine C, Kurosawa S, Remick DG (2011). “The pathogenesis of sepsis”. Annu Rev Pathol. 6: 19–48. doi:10.1146/annurev-pathol-011110-130327. PMC 3684427. PMID 20887193.
  5. Cunneen J, Cartwright M (2004). “The puzzle of sepsis: fitting the pieces of the inflammatory response with treatment”. AACN Clin Issues. 15 (1): 18–44. PMID 14767363.
  6. Chaudhry H, Zhou J, Zhong Y, Ali MM, McGuire F, Nagarkatti PS, Nagarkatti M (2013). “Role of cytokines as a double-edged sword in sepsis”. In Vivo. 27 (6): 669–84. PMC 4378830. PMID 24292568.
  7. Meyer NJ, Prescott HC (December 2024). “Sepsis and Septic Shock”. N Engl J Med. 391 (22): 2133–2146. doi:10.1056/NEJMra2403213. PMID 39774315 Check |pmid= value (help).
  8. Annane D, Aegerter P, Jars-Guincestre MC, Guidet B (2003). “Current epidemiology of septic shock: the CUB-Réa Network”. Am. J. Respir. Crit. Care Med. 168 (2): 165–72. doi:10.1164/rccm.2201087. PMID 12851245.
  9. Pronovost P, Needham D, Berenholtz S, Sinopoli D, Chu H, Cosgrove S, Sexton B, Hyzy R, Welsh R, Roth G, Bander J, Kepros J, Goeschel C (2006). “An intervention to decrease catheter-related bloodstream infections in the ICU”. N. Engl. J. Med. 355 (26): 2725–32. doi:10.1056/NEJMoa061115. PMID 17192537.
  10. Mayr FB, Yende S, Angus DC (2014). “Epidemiology of severe sepsis”. Virulence. 5 (1): 4–11. doi:10.4161/viru.27372. PMC 3916382. PMID 24335434.
  11. Machowicz R, Janka G, Wiktor-Jedrzejczak W (2017). “Similar but not the same: Differential diagnosis of HLH and sepsis”. Crit. Rev. Oncol. Hematol. 114: 1–12. doi:10.1016/j.critrevonc.2017.03.023. PMID 28477737.
  12. Parrillo, Joseph E.; Ayres, Stephen M. (1984). Major issues in critical care medicine. Baltimore: William Wilkins. ISBN 0-683-06754-0.
  13. Judith S. Hochman, E. Magnus Ohman (2009). Cardiogenic Shock. Wiley-Blackwell. ISBN 9781405179263.
  14. 14.0 14.1 14.2 14.3 “Products – Data Briefs – Number 62 – June 2011”. Retrieved 2012-09-17.
  15. 15.0 15.1 15.2 Meyer NJ, Prescott HC (December 2024). “Sepsis and Septic Shock”. N Engl J Med. 391 (22): 2133–2146. doi:10.1056/NEJMra2403213. PMID 39774315 Check |pmid= value (help).
  16. Ballouz T, Aridi J, Afif C, Irani J, Lakis C, Nasreddine R, Azar E (2017). “Risk Factors, Clinical Presentation, and Outcome of Acinetobacter baumannii Bacteremia”. Front Cell Infect Microbiol. 7: 156. doi:10.3389/fcimb.2017.00156. PMC 5415554. PMID 28523249.
  17. Kellum JA, Chawla LS, Keener C, Singbartl K, Palevsky PM, Pike FL; et al. (2016). “The Effects of Alternative Resuscitation Strategies on Acute Kidney Injury in Patients with Septic Shock”. Am J Respir Crit Care Med. 193 (3): 281–7. doi:10.1164/rccm.201505-0995OC. PMC 4803059. PMID 26398704.
  18. Kaukonen KM, Bailey M, Pilcher D, Cooper DJ, Bellomo R (2015). “Systemic Inflammatory Response Syndrome Criteria in Defining Severe Sepsis”. N Engl J Med. doi:10.1056/NEJMoa1415236. PMID 25776936.
  19. Capp R, Horton CL, Takhar SS, Ginde AA, Peak DA, Zane R; et al. (2015). “Predictors of Patients Who Present to the Emergency Department With Sepsis and Progress to Septic Shock Between 4 and 48 Hours of Emergency Department Arrival”. Crit Care Med. doi:10.1097/CCM.0000000000000861. PMID 25668750.
  20. Williams JM, Greenslade JH, Chu K, Brown AF, Lipman J (2016). “Severity Scores in Emergency Department Patients With Presumed Infection: A Prospective Validation Study”. Crit Care Med. 44 (3): 539–47. doi:10.1097/CCM.0000000000001427. PMID 26901543.
  21. Shapiro NI, Wolfe RE, Moore RB, Smith E, Burdick E, Bates DW (2003). “Mortality in Emergency Department Sepsis (MEDS) score: a prospectively derived and validated clinical prediction rule”. Crit. Care Med. 31 (3): 670–5. doi:10.1097/01.CCM.0000054867.01688.D1. PMID 12626967.
  22. Seymour CW, Liu VX, Iwashyna TJ, Brunkhorst FM, Rea TD, Scherag A; et al. (2016). “Assessment of Clinical Criteria for Sepsis: For the Third International Consensus Definitions for Sepsis and Septic Shock (Sepsis-3)”. JAMA. 315 (8): 762–74. doi:10.1001/jama.2016.0288. PMID 26903335.
  23. GitHub Contributors. Prognosticating in sepsis with decision aids: a living systematic review. GitHub. Available at https://github.com/openMetaAnalysis/Sepsis-prognosticating-with-decision-aids/blob/master/README.md. Accessed January 26, 2017.
  24. Lever A, Mackenzie I (2007). “Sepsis: definition, epidemiology, and diagnosis”. BMJ. 335 (7625): 879–83. doi:10.1136/bmj.39346.495880.AE. PMC 2043413. PMID 17962288.
  25. Juneja, Deven (2012). “Severe sepsis and septic shock in the elderly: An overview”. World Journal of Critical Care Medicine. 1 (1): 23. doi:10.5492/wjccm.v1.i1.23. ISSN 2220-3141.
  26. Dellinger RP, Levy MM, Carlet JM, Bion J, Parker MM, Jaeschke R, Reinhart K, Angus DC, Brun-Buisson C, Beale R, Calandra T, Dhainaut JF, Gerlach H, Harvey M, Marini JJ, Marshall J, Ranieri M, Ramsay G, Sevransky J, Thompson BT, Townsend S, Vender JS, Zimmerman JL, Vincent JL (2008). “Surviving Sepsis Campaign: international guidelines for management of severe sepsis and septic shock: 2008”. Critical Care Medicine. 36 (1): 296–327. doi:10.1097/01.CCM.0000298158.12101.41. PMID 18158437. Retrieved 2012-09-16. Unknown parameter |month= ignored (help)
  27. Bone RC, Balk RA, Cerra FB, Dellinger RP, Fein AM, Knaus WA, Schein RM, Sibbald WJ. Definitions for sepsis and organ failure and guidelines for the use of innovative therapies in sepsis. The ACCP/SCCM Consensus Conference Committee. American College of Chest Physicians/Society of Critical Care Medicine. Chest. 1992 Jun;101(6):1644-55. PMID 1303622.
  28. Darmon M, Ostermann M, Cerda J, Dimopoulos MA, Forni L, Hoste E, Legrand M, Lerolle N, Rondeau E, Schneider A, Souweine B, Schetz M (2017). “Diagnostic work-up and specific causes of acute kidney injury”. Intensive Care Med. doi:10.1007/s00134-017-4799-8. PMID 28444409.
  29. Wiedermann CJ, Adamson IY, Pert CB, Bowden DH. “Enhanced secretion of immunoreactive bombesin by alveolar macrophages exposed to silica”. Journal of Leukocyte Biology. 43 (2): 99–103. PMID 2826633. Retrieved 2012-09-17.
  30. Dellinger RP, Levy MM, Rhodes A, Annane D, Gerlach H, Opal SM; et al. (2013). “Surviving sepsis campaign: international guidelines for management of severe sepsis and septic shock: 2012”. Crit Care Med. 41 (2): 580–637. doi:10.1097/CCM.0b013e31827e83af. PMID 23353941.
  31. Dellinger RP, Levy MM, Rhodes A, Annane D, Gerlach H, Opal SM; et al. (2013). “Surviving Sepsis Campaign: international guidelines for management of severe sepsis and septic shock, 2012”. Intensive Care Med. 39 (2): 165–228. doi:10.1007/s00134-012-2769-8. PMID 23361625.
  32. Rhodes A, Phillips G, Beale R, Cecconi M, Chiche JD, De Backer D; et al. (2015). “The Surviving Sepsis Campaign bundles and outcome: results from the International Multicentre Prevalence Study on Sepsis (the IMPreSS study)”. Intensive Care Med. 41 (9): 1620–8. doi:10.1007/s00134-015-3906-y. PMID 26109396.
  33. Levy MM, Rhodes A, Phillips GS, Townsend SR, Schorr CA, Beale R; et al. (2015). “Surviving Sepsis Campaign: association between performance metrics and outcomes in a 7.5-year study”. Crit Care Med. 43 (1): 3–12. doi:10.1097/CCM.0000000000000723. PMID 25275252.
  34. 34.0 34.1 Miller RR, Dong L, Nelson NC, Brown SM, Kuttler KG, Probst DR; et al. (2013). “Multicenter implementation of a severe sepsis and septic shock treatment bundle”. Am J Respir Crit Care Med. 188 (1): 77–82. doi:10.1164/rccm.201212-2199OC. PMC 3735248. PMID 23631750.
  35. Leisman D, Wie B, Doerfler M, Bianculli A, Frances Ward M, Akerman M; et al. (2016). “Association of Fluid Resuscitation Initiation Within 30 Minutes of Severe Sepsis and Septic Shock Recognition With Reduced Mortality and Length of Stay”. Ann Emerg Med. doi:10.1016/j.annemergmed.2016.02.044. PMID 27085369.
  36. Narayanan N, Gross AK, Pintens M, Fee C, MacDougall C (2016). “Effect of an electronic medical record alert for severe sepsis among ED patients”. Am J Emerg Med. 34 (2): 185–8. doi:10.1016/j.ajem.2015.10.005. PMID 26573784.
  37. Semler MW, Weavind L, Hooper MH, Rice TW, Gowda SS, Nadas A; et al. (2015). “An Electronic Tool for the Evaluation and Treatment of Sepsis in the ICU: A Randomized Controlled Trial”. Crit Care Med. 43 (8): 1595–602. doi:10.1097/CCM.0000000000001020. PMC 4506222. PMID 25867906.
  38. GitHub Contributors. Sepsis alerts to improve diagnosis: a living systematic review. GitHub. Available at https://github.com/openMetaAnalysis/Sepsis-alerts-to-improve-diagnosis/blob/master/README.md. Accessed March 15, 2017.
  39. Harrison AM, Gajic O, Pickering BW, Herasevich V (2016). “Development and Implementation of Sepsis Alert Systems”. Clin Chest Med. 37 (2): 219–29. doi:10.1016/j.ccm.2016.01.004. PMC 4884325. PMID 27229639.
  40. “Q & A | Sepsis | CDC”.

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Definitions

Sepsis currently has differing definitions as shown in the table below. These definitions were compiled from the three following sources:

1) Surviving Sepsis Campaign: International Guidelines for Management of Sepsis and Septic Shock (2016)

2) Center of Medicare and Medicaid Services (CMS) (2015/2016)

3) The Third International Consensus Definitions for Sepsis and Septic Shock (Sepsis-3) from 2016

Sepsis Severe Sepsis Septic Shock
Surviving Sepsis

Campaign

Life-threatening organ dysfunction caused by a dysregulated host response to infection Not defined A subset of sepsis with circulatory and cellular/metabolic dysfunction associated with a higher risk of mortality
Center of Medicare and

Medicaid Services

Both of the following:

1) 2 or more SIRS criteria

2) Known/suspected source of infection

Sepsis + end organ dysfunction

(See CMS Sepsis Core Measure Algorithm)

Severe Sepsis + Lactate level greater than/equal to 4 mmol/L OR hypotension in the first hour after completion of a 30 ml/kg bolus
Sepsis-3 Acute change in greater than/equal to 2 SOFA criteria secondary to an infection Not defined Requirement of vasopressors to maintain MAP > 65 mmHg and serum lactate > 2 mmol/L in the absence of hypovolemia

This table is based on the 2019 published table by the Wisconsin Chapter of American College of Emergency Physicians.

See also

References


Pathophysiology

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-In-Chief: Priyamvada Singh, M.B.B.S. [2] ; Aditya Ganti M.B.B.S. [3]; Parth Vikram Singh, MBBS[4]

Synonyms and keywords: sepsis syndrome; septic shock; septicemia

Overview

The immunological response that causes sepsis is a systemic inflammatory response causing widespread activation of inflammation and coagulation pathways. This may progress to dysfunction of the circulatory system and, even under optimal treatment, may result in the multiple organ dysfunction syndrome and eventually death. A subclass of distributive shock, with shock referring specifically to decreased tissue perfusion resulting in end-organ dysfunction. Cytokines TNFα, IL-1β, interferon γ, IL-6 released in a large scale inflammatory response results in massive vasodilation, increased capillary permeability, decreased systemic vascular resistance, and hypotension. Hypotension reduces tissue perfusion pressure and thus tissue hypoxia ensues. Finally, in an attempt to offset decreased blood pressure, ventricular dilatation and myocardial dysfunction will occur. [1][2][3][4][5]

Pathophysiology

Immune system activation

Immune response

The endothelium and coagulation system

  • The vascular endothelium plays a major role in the host’s defense to an invading organism, but also in the development of sepsis.
  • Activated endothelium not only allows the adhesion and migration of stimulated immune cells but becomes porous to large molecules such as proteins, resulting in the tissue edema.
  • Alterations in the coagulation systems include an increase in procoagulant factors, such as plasminogen activator inhibitor type I and tissue factor, and reduced circulating levels of natural anticoagulants, including antithrombin III and activated protein C (APC), which also carry anti-inflammatory and modulatory roles.
  • Additionally, microvascular injury is now recognized as a critical process: endothelial glycocalyx shedding disrupts the vascular barrier, promotes thrombosis, and amplifies inflammation, while complement overactivation further exacerbates tissue damage and organ dysfunction.

Inflammation and organ dysfunction

  • Through vasodilatation (causing reduced systemic vascular resistance) and increased capillary permeability (causing extravasation of plasma), sepsis results in relative and absolute reductions in circulating volume.
  • A number of factors combine to produce multiple organ dysfunctions.
  • Relative and absolute hypovolemia are compounded by reduced left ventricular contractility to produce hypotension.
  • Initially, through an increased heart rate, cardiac output increases to compensate and maintain perfusion pressures, but as this compensatory mechanism becomes exhausted, hypoperfusion and shock may result.
  • Impaired tissue oxygen delivery is exacerbated by pericapillary edema.
  • It makes oxygen to diffuse a greater distance to reach target cells.
  • There is a reduction of capillary diameter due to mural edema and the procoagulant state results in capillary microthrombus formation.

Additional contributing factors

  • Decreased blood flow through capillary beds, resulting from a combination of shunting of blood through collateral channels and an increase in blood viscosity secondary to loss of red cell flexibility.
  • As a result, organs become hypoxic, even with increased blood flow.
  • These abnormalities result in lactic acidosis, cellular dysfunction, and multiorgan failure.
  • Cellular energy levels fall as metabolic activity begins to exceed production.
  • However, cell death appears to be uncommon in sepsis, implying that cells shut down as part of the systemic response.
  • This could explain why relatively few histologic changes are found at autopsy, and the eventual rapid resolution of severe symptoms, such as complete anuria and hypotension, once the systemic inflammation resolves.
  • Importantly, heterogeneity is increasingly recognized: molecular profiling and gene expression studies have revealed distinct sepsis subtypes, some resembling macrophage activation–like syndromes, which may respond differently to targeted therapies.

Genetics

There are no genetic conditions associated with sepsis.

References

  1. Minasyan H (2017). “Sepsis and septic shock: Pathogenesis and treatment perspectives”. J Crit Care. 40: 229–242. doi:10.1016/j.jcrc.2017.04.015. PMID 28448952.
  2. 2.0 2.1 Pop-Began V, Păunescu V, Grigorean V, Pop-Began D, Popescu C (2014). “Molecular mechanisms in the pathogenesis of sepsis”. J Med Life. 7 Spec No. 2: 38–41. PMC 4391358. PMID 25870671.
  3. 3.0 3.1 Stearns-Kurosawa DJ, Osuchowski MF, Valentine C, Kurosawa S, Remick DG (2011). “The pathogenesis of sepsis”. Annu Rev Pathol. 6: 19–48. doi:10.1146/annurev-pathol-011110-130327. PMC 3684427. PMID 20887193.
  4. 4.0 4.1 Cunneen J, Cartwright M (2004). “The puzzle of sepsis: fitting the pieces of the inflammatory response with treatment”. AACN Clin Issues. 15 (1): 18–44. PMID 14767363.
  5. 5.0 5.1 Chaudhry H, Zhou J, Zhong Y, Ali MM, McGuire F, Nagarkatti PS, Nagarkatti M (2013). “Role of cytokines as a double-edged sword in sepsis”. In Vivo. 27 (6): 669–84. PMC 4378830. PMID 24292568.
  6. Meyer NJ, Prescott HC (December 2024). “Sepsis and Septic Shock”. N Engl J Med. 391 (22): 2133–2146. doi:10.1056/NEJMra2403213. PMID 39774315 Check |pmid= value (help).

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Causes

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-In-Chief: Priyamvada Singh, M.B.B.S. [2]

Overview

The process of infection by bacteria or fungi can result in systemic signs and symptoms that are variously described. In rough order of severity, these are bacteremia or fungemia; septicemia; sepsis, severe sepsis or sepsis syndrome; septic shock; refractory septic shock; multiple organ dysfunction syndrome, and death. The condition develops as a response to certain microbial molecules which trigger the production and release of cellular mediators, such as tumor necrosis factors (TNF); these act to stimulate immune response.[1]

Causes

Life Threatening Causes

Sepsis is a life-threatening condition, if left untreated it results in death.

Common Causes

Sepsis is caused by a bacterial infection that can begin anywhere in the body. Common places where an infection might start include:

Microorganisms

Common organisms responsible for sepsis includes:[2][3]

Aerobic bacteria Anaerobes bacteria Fungal Parasite

Causes by Organ System

Cardiovascular Acute bacterial endocarditis, myocardial ring abscess, subacute bacterial endocarditis
Chemical / poisoning No underlying causes
Dermatologic No underlying causes
Drug Side Effect Aldesleukin,Aprotinin, Boceprevir, Caspofungin acetate, Ceritinib, Crizotinib, Cytarabine, Dactinomycin, Doxorubicin Hydrochloride, Felbamate, Ixabepilone, Meropenem, Mitomycin, Oxaprozin, Pergolide, Pralatrexate, , Pramipexole, Sargramostim, Sipuleucel-T, Sirolimus, Strontium chloride, Tiagabine, Tocilizumab, Vedolizumab
Ear Nose Throat Bronchitis, otitis media, pharyngitis, sinusitis
Endocrine No underlying causes
Environmental No underlying causes
Gastroenterologic Abscess, Bicalutamide, esophagitis, gastritis, gastrointestinal bleeding, instrumentation, intestinal obstruction, pancreatitis, small intestine disorder
Genetic No underlying causes
Hematologic No underlying causes
Iatrogenic No underlying causes
Infectious Disease Enterococcus, Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, Staphylococcus aureus, Proteus,

Bacteroides fragilis, Clostridium perfringens, Candida albicans, Candida tropicalis, Entamoeba histolytica

Musculoskeletal / Ortho Osteomyelitis, wound infections
Neurologic Acute bacterial meningitis
Nutritional / Metabolic No underlying causes
Obstetric/Gynecologic No underlying causes
Oncologic No underlying causes
Opthalmologic No underlying causes
Overdose / Toxicity No underlying causes
Psychiatric No underlying causes
Pulmonary Community-acquired pneumonia, empyema, lung abscess
Renal / Electrolyte Acute prostatitis/abscess, catheter-associated bacteriuria, cervicitis, chronic kidney disease, cystitis, instrumentation, intranephric abscess or perinephric abscess, pyelonephritis, renal calculi, urethritis, urinary tract obstruction, vaginitis
Rheum / Immune / Allergy No underlying causes
Sexual No underlying causes
Trauma No underlying causes
Urologic No underlying causes
Miscellaneous No underlying causes

Causes in Alphabetical Order

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3

References

  1. Mayr FB, Yende S, Angus DC (2014). “Epidemiology of severe sepsis”. Virulence. 5 (1): 4–11. doi:10.4161/viru.27372. PMC 3916382. PMID 24335434.
  2. Annane D, Aegerter P, Jars-Guincestre MC, Guidet B (2003). “Current epidemiology of septic shock: the CUB-Réa Network”. Am. J. Respir. Crit. Care Med. 168 (2): 165–72. doi:10.1164/rccm.2201087. PMID 12851245.
  3. Pronovost P, Needham D, Berenholtz S, Sinopoli D, Chu H, Cosgrove S, Sexton B, Hyzy R, Welsh R, Roth G, Bander J, Kepros J, Goeschel C (2006). “An intervention to decrease catheter-related bloodstream infections in the ICU”. N. Engl. J. Med. 355 (26): 2725–32. doi:10.1056/NEJMoa061115. PMID 17192537.

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Differentiating Sepsis from other Diseases

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-In-Chief: Priyamvada Singh, M.B.B.S. [2]

Overview

Sepsis must be differentiated from other syndromes such as the acute bacterial endocarditis, myocardial ring abscess, subacute bacterial endocarditis and bacterial meningitis.[1]

Differential Diagnosis

Sepsis must be differentiated from other causes of shock and fever based on clinical and hemodynamic findings.

Classification of shock based on hemodynamic parameters. [2][3]
Type of Shock Etiology CO SVR PCWP CVP SVO2 RVS RVD PAS PAD
Cardiogenic Acute Ventricular Septal Defect ↓↓ N — ↑ ↑↑ ↑ — ↑↑ N — ↑ N — ↑ N — ↑
Acute Mitral Regurgitation ↓↓ ↑↑ ↑ — ↑↑ N — ↑
Myocardial Dysfunction ↓↓ ↑↑ ↑↑ N — ↑ N — ↑ N — ↑
Right Ventricular Infarction ↓↓ N — ↓ ↑↑ ↓ — ↑ ↓ — ↑ ↓ — ↑
Obstructive Pulmonary Embolism ↓↓ N — ↓ ↑↑ ↓ — ↑ ↓ — ↑ ↓ — ↑
Cardiac Tamponade ↓ — ↓↓ ↑↑ ↑↑ N — ↑ N — ↑ N — ↑
Distributive Septic Shock N — ↑↑ ↓ — ↓↓ N — ↓ N — ↓ ↑ — ↑↑ N — ↓ N — ↓
Anaphylactic Shock N — ↑↑ ↓ — ↓↓ N — ↓ N — ↓ ↑ — ↑↑ N — ↓ N — ↓
Hypovolemic Volume Depletion ↓↓ ↓↓ ↓↓ N — ↓ N — ↓

Abbreviations: CO: cardiac output, CVP: central venous pressure, PAD: pulmonary artery diastolic pressure. PAS: pulmonary artery systolic pressure, RVD: right ventricular diastolic pressure.RVS: right ventricular systolic pressure. SVO2: systemic venous oxygen saturation, SVR: systemic vascular resistance.

Other non-infectious causes of systemic inflammatory response syndrome (SIRS) that must be considered include:

References

  1. Machowicz R, Janka G, Wiktor-Jedrzejczak W (2017). “Similar but not the same: Differential diagnosis of HLH and sepsis”. Crit. Rev. Oncol. Hematol. 114: 1–12. doi:10.1016/j.critrevonc.2017.03.023. PMID 28477737.
  2. Parrillo, Joseph E.; Ayres, Stephen M. (1984). Major issues in critical care medicine. Baltimore: William Wilkins. ISBN 0-683-06754-0.
  3. Judith S. Hochman, E. Magnus Ohman (2009). Cardiogenic Shock. Wiley-Blackwell. ISBN 9781405179263.

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Epidemiology and Demographics

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-In-Chief: Priyamvada Singh, M.B.B.S. [2]; Parth Vikram Singh, MBBS[3]

Synonyms and keywords: sepsis syndrome; septic shock; septicemia

Overview

The hospitalization rate of those with a principal diagnosis of septicemia or sepsis more than doubled from 2000 through 2008. During the same period, the hospitalization rate for those with septicemia or sepsis as a principal or as a secondary diagnosis increased by 70% from 221 to 377 for every 100,000 people. Reasons for these increases may include an aging population with more chronic illnesses, greater use of invasive procedures, immunosuppressive drugs, chemotherapy, transplantation, and increasing microbial resistance to antibiotics.[1]

Epidemiology and Demographics

Incidence and prevalance

  • It is the tenth most common cause of death overall according to data from the Center for Disease Control and Prevention.[2] [1]
  • The hospitalization rate of those with a principal diagnosis of septicemia or sepsis more than doubled from 2000 through 2008, increasing from 116 to 240 per 100,000 population.
  • During the same period, the hospitalization rate for those with septicemia or sepsis as a principal or as a secondary diagnosis increased by 70% from 221 to 377 for every 100,000 people.
  • Reasons for these increases may include an aging population with more chronic illnesses, greater use of invasive procedures, immunosuppressive drugs, chemotherapy, transplantation, and increasing microbial resistance to antibiotics.[3] Increased coding of these conditions due to greater clinical awareness of septicemia or sepsis[4] may also have occurred during the period studied.
  • On a global scale, the burden of sepsis remains high, with an estimated 48.9 million cases and 11 million deaths annually, of which nearly 85% occur in low- and middle-income countries (LMICs), particularly in sub-Saharan Africa.[5]

Mortality

  • Only 2% of hospitalizations in 2008 were for septicemia or sepsis, yet they made up 17% of in-hospital deaths.
  • In-hospital deaths were more than eight times as likely among patients hospitalized for septicemia or sepsis (17%) compared with other diagnoses (2%). In addition, those hospitalized for septicemia or sepsis were one-half as likely to be discharged home, twice as likely to be transferred to another short-term care facility, and three times as likely to be discharged to long-term care institutions, compared to those with other diagnoses.
  • Sepsis may be the cause for up to 50% of hospital deaths[6][7].

Age

  • For those under age 65, 13% of those hospitalized for septicemia or sepsis died in the hospital, compared with 1% of those hospitalized for other conditions.[1]
  • For those aged 65 and over, 20% of septicemia or sepsis hospitalizations ended in death compared with 3% for other hospitalizations.
  • Sepsis is common and also more dangerous in elderly, immunocompromised, and critically ill patients.

Race

  • More common in African Americans compared to other races in the United States.

Developed Countries

  • In the United States, sepsis is the leading cause of death in non-coronary ICU patients.

Worldwide

  • It is a major cause of death in intensive care units worldwide, with mortality rates that range from 20% for sepsis to 40% for severe sepsis to > 60% for septic shock.
  • It occurs in 1%–2% of all hospitalizations, accounts for as much as 25% of intensive care unit (ICU) bed utilization, and its disproportionate impact on LMICs underscores global health inequities.

References

  1. 1.0 1.1 1.2 “Products – Data Briefs – Number 62 – June 2011”. Retrieved 2012-09-17.
  2. Martin GS, Mannino DM, Eaton S, Moss M. The epidemiology of sepsis in the United States from 1979 through 2000. N Engl J Med. 2003 Apr 17;348(16):1546-54. PMID 12700374 Full Text.
  3. Angus DC, Linde-Zwirble WT, Lidicker J, Clermont G, Carcillo J, Pinsky MR. “Epidemiology of severe sepsis in the United States: analysis of incidence, outcome, and associated costs of care”. Critical Care Medicine. 29 (7): 1303–10. PMID 11445675.
  4. Wiedermann CJ, Adamson IY, Pert CB, Bowden DH. “Enhanced secretion of immunoreactive bombesin by alveolar macrophages exposed to silica”. Journal of Leukocyte Biology. 43 (2): 99–103. PMID 2826633.
  5. Meyer NJ, Prescott HC (December 2024). “Sepsis and Septic Shock”. N Engl J Med. 391 (22): 2133–2146. doi:10.1056/NEJMra2403213. PMID 39774315 Check |pmid= value (help).
  6. Rhee C, Jones TM, Hamad Y, Pande A, Varon J, O’Brien C; et al. (2019). “Prevalence, Underlying Causes, and Preventability of Sepsis-Associated Mortality in US Acute Care Hospitals”. JAMA Netw Open. 2 (2): e187571. doi:10.1001/jamanetworkopen.2018.7571. PMC 6484603. PMID 30768188.
  7. Liu V, Escobar GJ, Greene JD, Soule J, Whippy A, Angus DC; et al. (2014). “Hospital deaths in patients with sepsis from 2 independent cohorts”. JAMA. 312 (1): 90–2. doi:10.1001/jama.2014.5804. PMID 24838355.

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Risk Factors

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-In-Chief: Priyamvada Singh, M.B.B.S. [2]

Synonyms and keywords: sepsis syndrome; septic shock; septicemia

Overview

Common risk factors in the development of sepsis include elderly people with more chronic illnesses; greater use of invasive procedures, immunosuppressive drugs, chemotherapy, and transplantation; and increasing microbial resistance to antibiotics. Other patients population at increased risk are ICU admits, immunocompromised, bacteremic, with community acquired pneumonia, and with genetic predisposition.[1][2]

Risk Factors

Common risk factors in the development of sepsis are

References

  1. Ballouz T, Aridi J, Afif C, Irani J, Lakis C, Nasreddine R, Azar E (2017). “Risk Factors, Clinical Presentation, and Outcome of Acinetobacter baumannii Bacteremia”. Front Cell Infect Microbiol. 7: 156. doi:10.3389/fcimb.2017.00156. PMC 5415554. PMID 28523249.
  2. “Products – Data Briefs – Number 62 – June 2011”. Retrieved 2012-09-17.

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Natural History, Complications and Prognosis

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-In-Chief: Priyamvada Singh, M.B.B.S. [2]; Parth Vikram Singh, MBBS[3]

Synonyms and keywords: sepsis syndrome; septic shock; septicemia

Overview

There are many complications associated with sepsis, especially because it is a systemic phenomenon. Sepsis is a severe condition, and the prognosis of the patient will depend greatly on the condition and overall health of the patient. Many factors, such as age, hosts immune response, site of infection, type of infection, appropriate antibiotic therapy, and restoration of circulation of perfusion contribute to the overall prognosis.[1][2] [3][4][5][6] [7]

No universal diagnostic test for sepsis yet exists, and studies suggest that nearly one-third of patients treated for bacterial sepsis are later found to have a noninfectious illness.[8]

Natural History

If left untreated sepsis can lead to multiorgan failure and eventually death. Even in survivors, high rates of cognitive dysfunction, functional decline, and inability to return to work (e.g., 40% in a Norwegian study) are reported. Persistent immune dysregulation after sepsis is strongly correlated with late mortality.

Complications

Prognosis

The serum lactate level may be more predictive of outcomes than the serum bicarbonate[9].

Transitional care interventions, including structured follow-up and multidisciplinary support, have been shown to improve survival and recovery after sepsis (Kowalkowski 2022).[10]

Mortality

Mortality can be estimated with the MEDS (Mortality in Emergency Department Sepsis)score. More complicated scores such as the Apache, Sequential Organ Failure Assessment (SOFA), and Logistic Organ Dysfunction System (LODS) can be used as well.[4][5][6]

Mortality in Emergency Department Sepsis(MEDS) Point System[4]

The components and their scores for the MEDS are described in the following table

Component Points
Rapidly progressing terminal co-morbid illness 6
Age >65 3
Granulocytic bands are greater than 5% 3
If the patient has tachypnea or hypoxia 3
If the patient is in shock 3
If the patient has a platelet count of less than 150,000 mm3 3
Altered mental status 2
Resident of a nursing home 2
Lower respiratory infection 2

The total score will be added up and that total will correlate to the mortality percentage with a 95% confidence interval. The following are the point ranges associated with various mortality percentages.

  • 0-4 points total – 0.6% mortality rate
  • 5-7 points total – 5% mortality rate
  • 8-12 points total – 19% mortality rate
  • 13-15 points total – 32% mortality rate
  • 15+ points total – 40% mortality rate

The area under the receiver operating characteristic curve for the MEDs score is 0.92.[4]

Septic shock

Approximately 12% of of patients with sepsis progress to septic shock within 48 hours. Among variables studied (which did not include procalcitonin, predictors of progression to septic shock were:[3]

  • Nonpersistent hypotension
  • Bandemia at least 10%
  • Lactate at least 4.0 mmol/L
  • Past medical of coronary artery disease
  • Female gender

References

  1. 1.0 1.1 Kellum JA, Chawla LS, Keener C, Singbartl K, Palevsky PM, Pike FL; et al. (2016). “The Effects of Alternative Resuscitation Strategies on Acute Kidney Injury in Patients with Septic Shock”. Am J Respir Crit Care Med. 193 (3): 281–7. doi:10.1164/rccm.201505-0995OC. PMC 4803059. PMID 26398704.
  2. Kaukonen KM, Bailey M, Pilcher D, Cooper DJ, Bellomo R (2015). “Systemic Inflammatory Response Syndrome Criteria in Defining Severe Sepsis”. N Engl J Med. doi:10.1056/NEJMoa1415236. PMID 25776936.
  3. 3.0 3.1 Capp R, Horton CL, Takhar SS, Ginde AA, Peak DA, Zane R; et al. (2015). “Predictors of Patients Who Present to the Emergency Department With Sepsis and Progress to Septic Shock Between 4 and 48 Hours of Emergency Department Arrival”. Crit Care Med. doi:10.1097/CCM.0000000000000861. PMID 25668750.
  4. 4.0 4.1 4.2 4.3 Williams JM, Greenslade JH, Chu K, Brown AF, Lipman J (2016). “Severity Scores in Emergency Department Patients With Presumed Infection: A Prospective Validation Study”. Crit Care Med. 44 (3): 539–47. doi:10.1097/CCM.0000000000001427. PMID 26901543.
  5. 5.0 5.1 Shapiro NI, Wolfe RE, Moore RB, Smith E, Burdick E, Bates DW (2003). “Mortality in Emergency Department Sepsis (MEDS) score: a prospectively derived and validated clinical prediction rule”. Crit. Care Med. 31 (3): 670–5. doi:10.1097/01.CCM.0000054867.01688.D1. PMID 12626967.
  6. 6.0 6.1 Seymour CW, Liu VX, Iwashyna TJ, Brunkhorst FM, Rea TD, Scherag A; et al. (2016). “Assessment of Clinical Criteria for Sepsis: For the Third International Consensus Definitions for Sepsis and Septic Shock (Sepsis-3)”. JAMA. 315 (8): 762–74. doi:10.1001/jama.2016.0288. PMID 26903335.
  7. GitHub Contributors. Prognosticating in sepsis with decision aids: a living systematic review. GitHub. Available at https://github.com/openMetaAnalysis/Sepsis-prognosticating-with-decision-aids/blob/master/README.md. Accessed January 26, 2017.
  8. Meyer NJ, Prescott HC (December 2024). “Sepsis and Septic Shock”. N Engl J Med. 391 (22): 2133–2146. doi:10.1056/NEJMra2403213. PMID 39774315 Check |pmid= value (help).
  9. Meregalli A, Oliveira RP, Friedman G (2004). “Occult hypoperfusion is associated with increased mortality in hemodynamically stable, high-risk, surgical patients”. Crit Care. 8 (2): R60–5. doi:10.1186/cc2423. PMC 420024. PMID 15025779.
  10. Meyer NJ, Prescott HC (December 2024). “Sepsis and Septic Shock”. N Engl J Med. 391 (22): 2133–2146. doi:10.1056/NEJMra2403213. PMID 39774315 Check |pmid= value (help).

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Diagnosis

Diagnosis

Diagnostic Criteria | History and Symptoms | Physical Examination | Laboratory Findings | Electrocardiogram | Chest X Ray | CT | MRI | Echocardiography or Ultrasound | Other Imaging Findings | Other Diagnostic Studies

Treatment

Treatment

Medical Therapy | Primary Prevention | Secondary Prevention | Cost-Effectiveness of Therapy | Future or Investigational Therapies

Mandatory Reporting

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]Robert G. Badgett, M.D.[2]

Synonyms and keywords: sepsis syndrome; septic shock; septicemia

Overview

Several entities have instituted mandatory reporting in their jurisdictions. These efforts are consistent with prior recommendations by the Academy of Medicine for mandatory reporting[1].

Program, owner, and year of implementation Method Impact Comments
SEP-1

Centers for Medicare and Medicaid Services
10/01/2015

Public reporting at Medicare’s Hospital Compare website Not studied Complex and time-consuming for hospitals to collect data[2]
Bundled Payments for Care Improvement (BPCI)[3]

Centers for Medicare and Medicaid Services
2013

Voluntary

Financial incentives

No benefit after the first year of implementation[4]
Rory’s Regulations

State of New York[5]
2013

Mandatory by law Reduced mortality as compared to controlled states. Approximately half of patients in control states were accrued after announcement of plans for SEP-1 but all patients were included before implementation of SEP-1[6] Based on older SEPSIS-2[7]
Notes:

Federal reporting

Mandatory reporting of sepsis quality measures, “SEP-1” by Centers for Medicare and Medicaid Services was announced 08/2014 and implemented in 10/01/2015 as a value based purchase with the possibility of financial penalties[8][9][2]. Variations in hospital mortality contributed to the rationale for SEP-1[10]. As of 2017, 87% of eligible hospitals reported compliance measures with variation in rates of compliance[11].

Concerns about the reporting is the complexity of determining compliance as the documentation for chart reviews if 120 pages and may require 2-3 hours per chart to review[2]. The SEP-1 rule has been criticized for focusing on processes of care that are hard to measure rather than more easily measured rates and outcomes[2]. As an example, abstractions of clinical charts usually disagree over determining “time zero”[12].

Related is the voluntary Bundled Payments for Care Improvement (BPCI) initiative in 2013[3]. After the first 9 months of the BPCI, 88 of 2918 eligible hospitals participated in BPCI for sepsis[4]. No difference was found in the quality or costs of sepsis care[4].

New York state reporting

In 2013, the New York State Department of Health (NYSDOH) began mandatory state-wide reporting of quality measures (Rory’s Regulations)[5][13][14]. This was in part due to the death in 2012 of Rory Staunton. Implementation was based on SEPSIS-2[7]. Subsequent reduction in mortality was associated with increased compliance to process measures[14]. The benefit may be specifically linked to speed of antibiotic administration; however, study of fluids examined when fluids were finished and not when fluids were started[15].

In a controlled study, the improvement of care in New York exceeded the improvement in control states that were only under the influence of CMS pressure[6].

References

  1. Institute of Medicine (US) Committee on Quality of Health Care in America; Kohn LT, Corrigan JM, Donaldson MS, editors. To Err is Human: Building a Safer Health System. Washington (DC): National Academies Press (US); 2000. 5, Error Reporting Systems. Available from: https://www.ncbi.nlm.nih.gov/books/NBK225170/
  2. 2.0 2.1 2.2 2.3 Klompas M, Rhee C (2016). “The CMS Sepsis Mandate: Right Disease, Wrong Measure”. Ann Intern Med. 165 (7): 517–518. doi:10.7326/M16-0588. PMID 27294338.
  3. 3.0 3.1 Bundled Payments for Care Improvement (BPCI) initiative: general information. Baltimore: Centers for Medicare and Medicaid Services, 2017 (http://innovation.cms.gov/initiatives/bundled-payments/opens in new tab)
  4. 4.0 4.1 4.2 Joynt Maddox KE, Orav EJ, Zheng J, Epstein AM (2018). “Evaluation of Medicare’s Bundled Payments Initiative for Medical Conditions”. N Engl J Med. 379 (3): 260–269. doi:10.1056/NEJMsa1801569. PMID 30021090.
  5. 5.0 5.1 10 CRR-NY 405.4. Westlaw. Thomson Reuters [accessed 2019 Aug 13]. Available from: https://govt.westlaw.com/nycrr/Document/I4fe39657cd1711dda432a117e6e0f345
  6. 6.0 6.1 Kahn JM, Davis BS, Yabes JG, Chang CH, Chong DH, Hershey TB; et al. (2019). “Association Between State-Mandated Protocolized Sepsis Care and In-hospital Mortality Among Adults With Sepsis”. JAMA. 322 (3): 240–250. doi:10.1001/jama.2019.9021. PMC 6635905 Check |pmc= value (help). PMID 31310298.
  7. 7.0 7.1 Levy MM, Fink MP, Marshall JC, Abraham E, Angus D, Cook D; et al. (2003). “2001 SCCM/ESICM/ACCP/ATS/SIS International Sepsis Definitions Conference”. Intensive Care Med. 29 (4): 530–8. doi:10.1007/s00134-003-1662-x. PMID 12664219.
  8. Centers for Medicare and Medicaid Services (CMS), HHS (2014). “Medicare program; hospital inpatient prospective payment systems for acute care hospitals and the long-term care hospital prospective payment system and fiscal year 2015 rates; quality reporting requirements for specific providers; reasonable compensation equivalents for physician services in excluded hospitals and certain teaching hospitals; provider administrative appeals and judicial review; enforcement provisions for organ transplant centers; and electronic health record (EHR) incentive program. Final rule”. Fed Regist. 79 (163): 49853–50536. PMID 25167590.
  9. Cooke CR, Iwashyna TJ (2014). “Sepsis mandates: improving inpatient care while advancing quality improvement”. JAMA. 312 (14): 1397–8. doi:10.1001/jama.2014.11350. PMC 4813658. PMID 25291572.
  10. Hatfield KM, Dantes RB, Baggs J, Sapiano MRP, Fiore AE, Jernigan JA; et al. (2018). “Assessing Variability in Hospital-Level Mortality Among U.S. Medicare Beneficiaries With Hospitalizations for Severe Sepsis and Septic Shock”. Crit Care Med. 46 (11): 1753–1760. doi:10.1097/CCM.0000000000003324. PMID 30024430.
  11. Barbash IJ, Davis B, Kahn JM (2019). “National Performance on the Medicare SEP-1 Sepsis Quality Measure”. Crit Care Med. 47 (8): 1026–1032. doi:10.1097/CCM.0000000000003613. PMC 6588513 Check |pmc= value (help). PMID 30585827.
  12. Rhee C, Brown SR, Jones TM, O’Brien C, Pande A, Hamad Y; et al. (2018). “Variability in determining sepsis time zero and bundle compliance rates for the centers for medicare and medicaid services SEP-1 measure”. Infect Control Hosp Epidemiol. 39 (8): 994–996. doi:10.1017/ice.2018.134. PMID 29932042.
  13. Rory’s Regulations. Available at https://rorystauntonfoundationforsepsis.org/rorys-regulations-full-legal-document/
  14. 14.0 14.1 Levy MM, Gesten FC, Phillips GS, Terry KM, Seymour CW, Prescott HC; et al. (2018). “Mortality Changes Associated with Mandated Public Reporting for Sepsis. The Results of the New York State Initiative”. Am J Respir Crit Care Med. 198 (11): 1406–1412. doi:10.1164/rccm.201712-2545OC. PMC 6290949. PMID 30189749.
  15. Seymour CW, Gesten F, Prescott HC, Friedrich ME, Iwashyna TJ, Phillips GS; et al. (2017). “Time to Treatment and Mortality during Mandated Emergency Care for Sepsis”. N Engl J Med. 376 (23): 2235–2244. doi:10.1056/NEJMoa1703058. PMC 5538258. PMID 28528569.


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