Sepsis

Source: Wikipedia, the free encyclopedia.

Sepsis
vasopressors[1][5]
Prognosis10 to 80% risk of death;[4][6] These mortality rates (they are for a range of conditions along a spectrum: sepsis, severe sepsis, and septic shock) may be lower if treated aggressively and early, depending on the organism and disease, the patient's previous health, and the abilities of the treatment location and its staff
Frequencyin 2017 there were 48.9 million cases and 11 million sepsis-related deaths worldwide (according to WHO)

Sepsis is a potentially life-threatening condition that arises when the body's response to infection causes injury to its own tissues and organs.[4][7]

This initial stage of sepsis is followed by suppression of the

confusion.[1] There may also be symptoms related to a specific infection, such as a cough with pneumonia, or painful urination with a kidney infection.[2] The very young, old, and people with a weakened immune system may have no symptoms of a specific infection, and the body temperature may be low or normal instead of having a fever.[2] Severe sepsis causes poor organ function or blood flow.[9] The presence of low blood pressure, high blood lactate, or low urine output may suggest poor blood flow.[9] Septic shock is low blood pressure due to sepsis that does not improve after fluid replacement.[9]

Sepsis is caused by many organisms including bacteria, viruses and fungi.

blood to be infected.[2] Medical imaging is helpful when looking for the possible location of the infection.[9] Other potential causes of similar signs and symptoms include anaphylaxis, adrenal insufficiency, low blood volume, heart failure, and pulmonary embolism.[2]

Sepsis requires immediate treatment with

corticosteroids is controversial, with some reviews finding benefit,[11][12] and others not.[13]

Disease severity partly determines the outcome.

developed world, approximately 0.2 to 3 people per 1000 are affected by sepsis yearly, resulting in about a million cases per year in the United States.[6][17] Rates of disease have been increasing.[9] Some data indicate that sepsis is more common among males than females,[2] however, other data show a greater prevalence of the disease among women.[16] Descriptions of sepsis date back to the time of Hippocrates.[7]

Video summary (script)

Signs and symptoms

In addition to symptoms related to the actual cause, people with sepsis may have a

confusion, and edema.[18] Early signs include a rapid heart rate, decreased urination, and high blood sugar. Signs of established sepsis include confusion, metabolic acidosis (which may be accompanied by a faster breathing rate that leads to respiratory alkalosis), low blood pressure due to decreased systemic vascular resistance, higher cardiac output, and disorders in blood-clotting that may lead to organ failure.[19] Fever is the most common presenting symptom in sepsis, but fever may be absent in some people such as the elderly or those who are immunocompromised.[20]

The drop in blood pressure seen in sepsis can cause lightheadedness and is part of the criteria for septic shock.[21]

Oxidative stress is observed in septic shock, with circulating levels of copper and vitamin C being decreased.[22]

systolic pressure also decreases, causing a narrowing/decreasing of pulse pressure.[23] A pulse pressure of over 70 mmHg in patients with sepsis is correlated with an increased chance of survival.[24] A widened pulse pressure is also correlated with an increased chance that someone with sepsis will benefit from and respond to IV fluids.[24]

Cause

pain killers via automated injection employing infusion pumps (background right). Hemodialysis via the machine on the left became necessary due to kidney malfunction and multiple organ dysfunction syndrome
. After three months in hospital, the patient recovered within a month and is since then fully well (as of 2023).

Infections leading to sepsis are usually

staphylococci, are thought to cause more than 50% of cases of sepsis.[17][27] Other commonly implicated bacteria include Streptococcus pyogenes, Escherichia coli, Pseudomonas aeruginosa, and Klebsiella species.[28] Fungal sepsis accounts for approximately 5% of severe sepsis and septic shock cases; the most common cause of fungal sepsis is an infection by Candida species of yeast,[29] a frequent hospital-acquired infection. The most common causes for parasitic sepsis are Plasmodium (which leads to malaria), Schistosoma and Echinococcus
.

The most common sites of infection resulting in severe sepsis are the lungs, the abdomen, and the urinary tract.[25] Typically, 50% of all sepsis cases start as an infection in the lungs. In one-third to one-half of cases, the source of infection is unclear.[25]

Pathophysiology

Sepsis is caused by a combination of factors related to the particular invading pathogen(s) and to the status of the immune system of the host.[30] The early phase of sepsis characterized by excessive inflammation (sometimes resulting in a cytokine storm) may be followed by a prolonged period of decreased functioning of the immune system.[31][8] Either of these phases may prove fatal. On the other hand, systemic inflammatory response syndrome (SIRS) occurs in people without the presence of infection, for example, in those with burns, polytrauma, or the initial state in pancreatitis and chemical pneumonitis. However, sepsis also causes similar response to SIRS.[32]

Microbial factors

Bacterial

cytokines) by T-cells.[30]

There are a number of microbial factors that may cause the typical septic

nuclear factor-kappa B and activator protein-1, will up-regulate the expression of pro-inflammatory and anti-inflammatory cytokines.[37]

Host factors

Upon detection of microbial

macrophages, dendritic cells, CD4+ T cells, and B cells all undergo apoptosis, whereas regulatory T cells are more apoptosis resistant.[8] Subsequently, multiple organ failure ensues because tissues are unable to use oxygen efficiently due to inhibition of cytochrome c oxidase.[38]

Inflammatory responses cause

interleukin 1, and interleukin 6 may activate procoagulation factors in the cells lining blood vessels, leading to endothelial damage. The damaged endothelial surface inhibits anticoagulant properties as well as increases antifibrinolysis, which may lead to intravascular clotting, the formation of blood clots in small blood vessels, and multiple organ failure.[40]

The low blood pressure seen in those with sepsis is the result of various processes, including excessive production of chemicals that

Diagnosis

Early diagnosis is necessary to properly manage sepsis, as the initiation of rapid therapy is key to reducing deaths from severe sepsis.[9] Some hospitals use alerts generated from electronic health records to bring attention to potential cases as early as possible.[43]

aerobes, and yellow cap for blood samples from children[44]

Within the first three hours of suspected sepsis, diagnostic studies should include

present in the blood in only about 30% of cases.[45] Another possible method of detection is by polymerase chain reaction. If other sources of infection are suspected, cultures of these sources, such as urine, cerebrospinal fluid, wounds, or respiratory secretions, also should be obtained, as long as this does not delay the use of antibiotics.[9]

Within six hours, if blood pressure remains low despite initial fluid resuscitation of 30 mL/kg, or if initial lactate is ≥ four mmol/L (36 mg/dL),

central venous oxygen saturation should be measured.[9] Lactate should be re-measured if the initial lactate was elevated.[9] Evidence for point of care lactate measurement over usual methods of measurement, however, is poor.[46]

Within twelve hours, it is essential to diagnose or exclude any source of infection that would require emergent source control, such as a necrotizing soft tissue infection, an infection causing

internal organ (free air on an abdominal X-ray or CT scan), an abnormal chest X-ray consistent with pneumonia (with focal opacification), or petechiae, purpura, or purpura fulminans may indicate the presence of an infection.[citation needed
]

Definitions

Systemic inflammatory response syndrome[47]
Finding Value
Temperature
<36 °C (96.8 °F) or >38 °C (100.4 °F)
Heart rate >90/min
Respiratory rate >20/min or
PaCO2
<32 mmHg (4.3 kPa)
WBC
<4x109/L (<4000/mm3), >12x109/L (>12,000/mm3), or ≥10%
bands
Sepsis Steps. Training tool for teaching the progression of sepsis stages

Previously, SIRS criteria had been used to define sepsis. If the SIRS criteria are negative, it is very unlikely the person has sepsis; if it is positive, there is just a moderate probability that the person has sepsis. According to SIRS, there were different levels of sepsis: sepsis, severe sepsis, and septic shock.[32] The definition of SIRS is shown below:

In 2016 a new consensus was reached to replace screening by

qSOFA).[4] The three criteria for the qSOFA score include a respiratory rate greater than or equal to 22 breaths per minute, systolic blood pressure 100 mmHg or less and altered mental status.[4] Sepsis is suspected when 2 of the qSOFA criteria are met.[4] The SOFA score was intended to be used in the intensive care unit (ICU) where it is administered upon admission to the ICU and then repeated every 48 hours, whereas the qSOFA could be used outside the ICU.[20] Some advantages of the qSOFA score are that it can be administered quickly and does not require labs.[20] However, the American College of Chest Physicians (CHEST) raised concerns that qSOFA and SOFA criteria may lead to delayed diagnosis of serious infection, leading to delayed treatment.[49] Although SIRS criteria can be too sensitive and not specific enough in identifying sepsis, SOFA also has its limitations and is not intended to replace the SIRS definition.[50] qSOFA has also been found to be poorly sensitive though decently specific for the risk of death with SIRS possibly better for screening. NOTE - Surviving Sepsis Campaign 2021 Guidelines recommends "against using qSOFA compared with SIRS, NEWS, or MEWS as a single screening tool for sepsis or septic shock".[51]

End-organ dysfunction

Examples of end-organ dysfunction include the following:[52]

More specific definitions of end-organ dysfunction exist for SIRS in pediatrics.[53]

  • Cardiovascular dysfunction (after fluid resuscitation with at least 40 mL/kg of crystalloid)
    • hypotension with blood pressure < 5th percentile for age or systolic blood pressure < 2 standard deviations below normal for age, or
    • vasopressor
      requirement, or
    • two of the following criteria:
      • unexplained
        base deficit
        > 5 mEq/L
      • lactic acidosis: serum lactate 2 times the upper limit of normal
      • oliguria (urine output < 0.5 mL/kg/h)
      • prolonged capillary refill > 5 seconds
      • core to peripheral temperature difference > 3 °C
  • Respiratory dysfunction (in the absence of a cyanotic heart defect or a known chronic respiratory disease)
    • the ratio of the arterial partial-pressure of oxygen to the fraction of oxygen in the gases inspired (PaO2/FiO2) < 300 (the definition of
      acute lung injury
      ), or
    • arterial partial-pressure of carbon dioxide (PaCO2) > 65 torr (20 mmHg) over baseline PaCO2 (evidence of hypercapnic respiratory failure), or
    • supplemental oxygen requirement of greater than FiO2 0.5 to maintain oxygen saturation ≥ 92%
  • Neurologic dysfunction
  • Hematologic dysfunction
  • Kidney dysfunction
  • Liver dysfunction (only applicable to infants > 1 month)
    • total serum bilirubin ≥ 4 mg/dL, or
    • alanine aminotransferase
      (ALT) ≥ 2 times the upper limit of normal

Consensus definitions, however, continue to evolve, with the latest expanding the list of signs and symptoms of sepsis to reflect clinical bedside experience.[18]

Biomarkers

Biomarkers can help diagnosis because they can point to the presence or severity of sepsis, although their exact role in the management of sepsis remains undefined.[54] A 2013 review concluded moderate-quality evidence exists to support the use of the procalcitonin level as a method to distinguish sepsis from non-infectious causes of SIRS.[45] The same review found the sensitivity of the test to be 77% and the specificity to be 79%. The authors suggested that procalcitonin may serve as a helpful diagnostic marker for sepsis, but cautioned that its level alone does not definitively make the diagnosis.[45] More current literature recommends utilizing the PCT to direct antibiotic therapy for improved antibiotic stewardship and better patient outcomes.[55]

A 2012 systematic review found that

soluble urokinase-type plasminogen activator receptor (SuPAR) is a nonspecific marker of inflammation and does not accurately diagnose sepsis.[56] This same review concluded, however, that SuPAR has prognostic value, as higher SuPAR levels are associated with an increased rate of death in those with sepsis.[56] Serial measurement of lactate levels (approximately every 4 to 6 hours) may guide treatment and is associated with lower mortality in sepsis.[20]

Differential diagnosis

The

thyrotoxicosis, anaphylaxis, adrenal insufficiency, and neurogenic shock.[19][57] Hyperinflammatory syndromes such as hemophagocytic lymphohistiocytosis (HLH) may have similar symptoms and are on the differential diagnosis.[58]

Neonatal sepsis

In common clinical usage,

blood stream infection in the first month of life, such as meningitis, pneumonia, pyelonephritis, or gastroenteritis,[59] but neonatal sepsis also may be due to infection with fungi, viruses, or parasites.[59] Criteria with regard to hemodynamic compromise or respiratory failure are not useful because they present too late for intervention.[citation needed
]

Management

Intravenous fluids being given

Early recognition and focused management may improve the outcomes in sepsis. Current professional recommendations include a number of actions ("bundles") to be followed as soon as possible after diagnosis. Within the first three hours, someone with sepsis should have received antibiotics and, intravenous fluids if there is evidence of either low blood pressure or other evidence for inadequate blood supply to organs (as evidenced by a raised level of lactate); blood cultures also should be obtained within this time period. After six hours the blood pressure should be adequate, close monitoring of blood pressure and blood supply to organs should be in place, and the lactate should be measured again if initially it was raised.[9] A related bundle, the "Sepsis Six", is in widespread use in the United Kingdom; this requires the administration of antibiotics within an hour of recognition, blood cultures, lactate, and hemoglobin determination, urine output monitoring, high-flow oxygen, and intravenous fluids.[60][61]

Apart from the timely administration of fluids and

gastric ulcers also may be used.[9]

Antibiotics

Two sets of blood cultures (aerobic and anaerobic) are recommended without delaying the initiation of antibiotics. Cultures from other sites such as respiratory secretions, urine, wounds, cerebrospinal fluid, and catheter insertion sites (in-situ more than 48 hours) are recommended if infections from these sites are suspected.

β-lactam antibiotic with broad coverage, or broad-spectrum carbapenem combined with fluoroquinolones, macrolides, or aminoglycosides) are recommended. The choice of antibiotics is important in determining the survival of the person.[42][5] Some recommend they be given within one hour of making the diagnosis, stating that for every hour of delay in the administration of antibiotics, there is an associated 6% rise in mortality.[48][42] Others did not find a benefit with early administration.[62]

Several factors determine the most appropriate choice for the initial antibiotic regimen. These factors include local patterns of bacterial sensitivity to antibiotics, whether the infection is thought to be a

fluoroquinolone is chosen. If fungal infection is suspected, an echinocandin, such as caspofungin or micafungin, is chosen for people with severe sepsis, followed by triazole (fluconazole and itraconazole) for less ill people.[5] Prolonged antibiotic prophylaxis is not recommended in people who has SIRS without any infectious origin such as acute pancreatitis and burns unless sepsis is suspected.[5]

Once-daily dosing of aminoglycoside is sufficient to achieve peak plasma concentration for a clinical response without kidney toxicity. Meanwhile, for antibiotics with low volume distribution (vancomycin, teicoplanin, colistin), a loading dose is required to achieve an adequate therapeutic level to fight infections. Frequent infusions of beta-lactam antibiotics without exceeding total daily dose would help to keep the antibiotics level above minimum inhibitory concentration (MIC), thus providing a better clinical response.[5] Giving beta-lactam antibiotics continuously may be better than giving them intermittently.[63] Access to therapeutic drug monitoring is important to ensure adequate drug therapeutic level while at the same time preventing the drug from reaching toxic level.[5]

Intravenous fluids

The Surviving Sepsis Campaign has recommended 30 mL/kg of fluid to be given in adults in the first three hours followed by fluid titration according to blood pressure, urine output, respiratory rate, and oxygen saturation with a target mean arterial pressure (MAP) of 65 mmHg.[5] In children an initial amount of 20 mL/kg is reasonable in shock.[64] In cases of severe sepsis and septic shock where a central venous catheter is used to measure blood pressures dynamically, fluids should be administered until the central venous pressure reaches 8–12 mmHg.[41] Once these goals are met, the central venous oxygen saturation (ScvO2), i.e., the oxygen saturation of venous blood as it returns to the heart as measured at the vena cava, is optimized.[5] If the ScvO2 is less than 70%, blood may be given to reach a hemoglobin of 10 g/dL and then inotropes are added until the ScvO2 is optimized.[30] In those with acute respiratory distress syndrome (ARDS) and sufficient tissue blood fluid, more fluids should be given carefully.[9]

Crystalloid solution is recommended as the fluid of choice for resuscitation.[5] Albumin can be used if a large amount of crystalloid is required for resuscitation.[5] Crystalloid solutions shows little difference with hydroxyethyl starch in terms of risk of death.[65] Starches also carry an increased risk of acute kidney injury,[65][66] and need for blood transfusion.[67][68] Various colloid solutions (such as modified gelatin) carry no advantage over crystalloid.[65] Albumin also appears to be of no benefit over crystalloids.[69]

Blood products

The Surviving Sepsis Campaign recommended

intravenous immunoglobulin (IVIG) do not lower the rate of death in newborns and adults with sepsis.[71] Evidence for the use of IgM-enriched polyclonal preparations of IVIG is inconsistent.[71] On the other hand, the use of antithrombin to treat disseminated intravascular coagulation is also not useful. Meanwhile, the blood purification technique (such as hemoperfusion, plasma filtration, and coupled plasma filtration adsorption) to remove inflammatory mediators and bacterial toxins from the blood also does not demonstrate any survival benefit for septic shock.[5]

Vasopressors

If the person has been sufficiently fluid resuscitated but the

vasopressors are recommended.[5] Norepinephrine (noradrenaline) is recommended as the initial choice.[5] Delaying initiation of vasopressor therapy during septic shock is associated with increased mortality.[72]

Norepinephrine is often used as a first-line treatment for hypotensive septic shock because evidence shows that there is a relative deficiency of vasopressin when shock continues for 24 to 48 hours.

abnormal heart rhythms than norepinephrine and also has an immunosuppressive effect. Dopamine is not proven to have protective properties on the kidneys.[5] Dobutamine can also be used in hypotensive septic shock to increase cardiac output and correct blood flow to the tissues.[75] Dobutamine is not used as often as epinephrine due to its associated side effects, which include reducing blood flow to the gut.[75] Additionally, dobutamine increases the cardiac output by abnormally increasing the heart rate.[75]

Steroids

The use of

steroids in sepsis is controversial.[76] Studies do not give a clear picture as to whether and when glucocorticoids should be used.[77] The 2016 Surviving Sepsis Campaign recommends low dose hydrocortisone only if both intravenous fluids and vasopressors are not able to adequately treat septic shock.[5] The 2021 Surviving Sepsis Campaign recommends IV corticosteroids for adults with septic shock who have an ongoing requirement for vasopressor therapy. A 2019 Cochrane review found low-quality evidence of benefit,[11] as did two 2019 reviews.[12][78]

During critical illness, a state of

ACTH stimulation testing[79] nor random cortisol levels are recommended to confirm the diagnosis.[5] The method of stopping glucocorticoid drugs is variable, and it is unclear whether they should be slowly decreased or simply abruptly stopped. However, the 2016 Surviving Sepsis Campaign recommended to taper steroids when vasopressors are no longer needed.[5]

Anesthesia

A target

abnormal heart rhythms. A spontaneous breathing trial using continuous positive airway pressure (CPAP), T piece, or inspiratory pressure augmentation can be helpful in reducing the duration of ventilation. Minimizing intermittent or continuous sedation is helpful in reducing the duration of mechanical ventilation.[5]

General anesthesia is recommended for people with sepsis who require surgical procedures to remove the infective source. Usually, inhalational and intravenous anesthetics are used. Requirements for anesthetics may be reduced in sepsis.

mitochondrial function.[38] Although etomidate has a minimal effect on the cardiovascular system, it is often not recommended as a medication to help with intubation in this situation due to concerns it may lead to poor adrenal function and an increased risk of death.[81][82] The small amount of evidence there is, however, has not found a change in the risk of death with etomidate.[83]

Paralytic agents are not suggested for use in sepsis cases in the absence of ARDS, as a growing body of evidence points to reduced durations of mechanical ventilation, ICU and hospital stays.[9] However, paralytic use in ARDS cases remains controversial. When appropriately used, paralytics may aid successful mechanical ventilation, however, evidence has also suggested that mechanical ventilation in severe sepsis does not improve oxygen consumption and delivery.[9]

Source control

Source control refers to physical interventions to control a focus of infection and reduce conditions favorable to microorganism growth or host defense impairment, such as drainage of pus from an abscess. It is one of the oldest procedures for control of infections, giving rise to the Latin phrase Ubi pus, ibi evacua, and remains important despite the emergence of more modern treatments.[84][85]

Early goal directed therapy

Early goal directed therapy (EGDT) is an approach to the management of severe sepsis during the initial 6 hours after diagnosis.[86] It is a step-wise approach, with the physiologic goal of optimizing cardiac preload, afterload, and contractility.[87] It includes giving early antibiotics.[87] EGDT also involves monitoring of hemodynamic parameters and specific interventions to achieve key resuscitation targets which include maintaining a central venous pressure between 8–12 mmHg, a mean arterial pressure of between 65 and 90 mmHg, a central venous oxygen saturation (ScvO2) greater than 70% and a urine output of greater than 0.5 mL/kg/hour. The goal is to optimize oxygen delivery to tissues and achieve a balance between systemic oxygen delivery and demand.[87] An appropriate decrease in serum lactate may be equivalent to ScvO2 and easier to obtain.[88]

In the original trial, early goal-directed therapy was found to reduce mortality from 46.5% to 30.5% in those with sepsis,[87] and the Surviving Sepsis Campaign has been recommending its use.[9] However, three more recent large randomized control trials (ProCESS, ARISE, and ProMISe), did not demonstrate a 90-day mortality benefit of early goal-directed therapy when compared to standard therapy in severe sepsis.[89] It is likely that some parts of EGDT are more important than others.[89] Following these trials the use of EGDT is still considered reasonable.[90]

Newborns

Neonatal sepsis can be difficult to diagnose as newborns may be asymptomatic.[91] If a newborn shows signs and symptoms suggestive of sepsis, antibiotics are immediately started and are either changed to target a specific organism identified by diagnostic testing or discontinued after an infectious cause for the symptoms has been ruled out.[92] Despite early intervention, death occurs in 13% of children who develop septic shock, with the risk partly based on other health problems. For those without multiple organ system failures or who require only one inotropic agent, mortality is low.[93]

Other

Treating fever in sepsis, including people in septic shock, has not been associated with any improvement in mortality over a period of 28 days.[94] Treatment of fever still occurs for other reasons.[95][96]

A 2012

N-acetylcysteine does not reduce mortality in those with SIRS or sepsis and may even be harmful.[97]

drotrecogin alpha) was originally introduced for severe sepsis (as identified by a high APACHE II score), where it was thought to confer a survival benefit.[86] However, subsequent studies showed that it increased adverse events—bleeding risk in particular—and did not decrease mortality.[98] It was removed from sale in 2011.[98] Another medication known as eritoran also has not shown benefit.[99]

In those with high blood sugar levels, insulin to bring it down to 7.8–10 mmol/L (140–180 mg/dL) is recommended with lower levels potentially worsening outcomes.[100] Glucose levels taken from capillary blood should be interpreted with care because such measurements may not be accurate. If a person has an arterial catheter, arterial blood is recommended for blood glucose testing.[5]

Intermittent or continuous

ventricular arrhythmia such as torsades de pointes. The usage of prokinetic agents should be reassessed daily and stopped if no longer indicated.[5]

People in sepsis may have micronutrient deficiencies, including low levels of vitamin C.[101] Reviews mention that an intake of 3.0 g/day, which requires intravenous administration, may needed to maintain normal plasma concentrations in people with sepsis or severe burn injury.[102][103] Sepsis mortality is reduced with administration of intravenous vitamin C.[104]

Prognosis

Sepsis will prove fatal in approximately 24.4% of people, and septic shock will prove fatal in 34.7% of people within 30 days (32.2% and 38.5% after 90 days).[105] Lactate is a useful method of determining prognosis, with those who have a level greater than 4 mmol/L having a mortality of 40% and those with a level of less than 2 mmol/L having a mortality of less than 15%.[48]

There are a number of prognostic stratification systems, such as APACHE II and Mortality in Emergency Department Sepsis. APACHE II factors in the person's age, underlying condition, and various physiologic variables to yield estimates of the risk of dying of severe sepsis. Of the individual covariates, the severity of the underlying disease most strongly influences the risk of death. Septic shock is also a strong predictor of short- and long-term mortality. Case-fatality rates are similar for culture-positive and culture-negative severe sepsis. The Mortality in Emergency Department Sepsis (MEDS) score is simpler and useful in the emergency department environment.[106]

Some people may experience severe long-term cognitive decline following an episode of severe sepsis, but the absence of baseline neuropsychological data in most people with sepsis makes the incidence of this difficult to quantify or to study.[107]

Epidemiology

Sepsis causes millions of deaths globally each year and is the most common cause of death in people who have been hospitalized.[3][86] The number of new cases worldwide of sepsis is estimated to be 18 million cases per year.[108] In the United States sepsis affects approximately 3 in 1,000 people,[48] and severe sepsis contributes to more than 200,000 deaths per year.[109]

Sepsis occurs in 1–2% of all hospitalizations and accounts for as much as 25% of ICU bed utilization. Due to it rarely being reported as a primary diagnosis (often being a complication of cancer or other illness), the incidence, mortality, and morbidity rates of sepsis are likely underestimated.[30] A study of U.S. states found approximately 651 hospital stays per 100,000 population with a sepsis diagnosis in 2010.[110] It is the second-leading cause of death in non-coronary intensive care unit (ICU) and the tenth-most-common cause of death overall (the first being heart disease).[111] Children under 12 months of age and elderly people have the highest incidence of severe sepsis.[30] Among people from the U.S. who had multiple sepsis hospital admissions in 2010, those who were discharged to a skilled nursing facility or long-term care following the initial hospitalization were more likely to be readmitted than those discharged to another form of care.[110] A study of 18 U.S. states found that, amongst people with Medicare in 2011, sepsis was the second most common principal reason for readmission within 30 days.[112]

Several medical conditions increase a person's susceptibility to infection and developing sepsis. Common sepsis risk factors include age (especially the very young and old); conditions that weaken the immune system such as

From 1979 to 2000, data from the United States National Hospital Discharge Survey showed that the incidence of sepsis increased fourfold, to 240 cases per 100,000 population, with a higher incidence in men when compared to women. However, the global prevalence of sepsis has been estimated to be higher in women.[16] During the same time frame, the in-hospital case fatality rate was reduced from 28% to 18%. However, according to the nationwide inpatient sample from the United States, the incidence of severe sepsis increased from 200 per 10,000 population in 2003 to 300 cases in 2007 for population aged more than 18 years. The incidence rate is particularly high among infants, with an incidence of 500 cases per 100,000 population. Mortality related to sepsis increases with age, from less than 10% in the age group of 3 to 5 years to 60% by sixth decade of life.[25] The increase in the average age of the population, alongside the presence of more people with chronic diseases or on immunosuppressive medications, and also the increase in the number of invasive procedures being performed, has led to an increased rate of sepsis.[26]

History

Personification of septicemia, carrying a spray can marked "Poison"

The term "σήψις" (sepsis) was introduced by Hippocrates in the fourth century BC, and it meant the process of decay or decomposition of organic matter.[115][116][117] In the eleventh century, Avicenna used the term "blood rot" for diseases linked to severe purulent process. Though severe systemic toxicity had already been observed, it was only in the 19th century that the specific term – sepsis – was used for this condition.

The terms "septicemia", also spelled "septicaemia", and "blood poisoning" referred to the microorganisms or their toxins in the blood. The

International Statistical Classification of Diseases and Related Health Problems (ICD) version 9, which was in use in the US until 2013, used the term septicemia with numerous modifiers for different diagnoses, such as "Streptococcal septicemia".[118] All those diagnoses have been converted to sepsis, again with modifiers, in ICD-10, such as "Sepsis due to streptococcus".[118]

The current terms are dependent on the microorganism that is present:

By the end of the 19th century, it was widely believed that

endotoxin at the beginning of the 20th century to denote the pyrogenic principle associated with Vibrio cholerae. It was soon realized that endotoxins were expressed by most and perhaps all gram-negative bacteria. The lipopolysaccharide character of enteric endotoxins was elucidated in 1944 by Shear.[120] The molecular character of this material was determined by Luderitz et al. in 1973.[121]

It was discovered in 1965 that a strain of C3H/HeJ mouse was immune to the endotoxin-induced shock.[122] The genetic locus for this effect was dubbed Lps. These mice were also found to be hyper susceptible to infection by gram-negative bacteria.[123] These observations were finally linked in 1998 by the discovery of the toll-like receptor gene 4 (TLR 4).[124] Genetic mapping work, performed over a period of five years, showed that TLR4 was the sole candidate locus within the Lps critical region; this strongly implied that a mutation within TLR4 must account for the lipopolysaccharide resistance phenotype. The defect in the TLR4 gene that led to the endotoxin resistant phenotype was discovered to be due to a mutation in the cytoplasm.[125]

Controversy occurred in the scientific community over the use of mouse models in research into sepsis in 2013 when scientists published a review of the mouse immune system compared to the human immune system and showed that on a systems level, the two worked very differently; the authors noted that as of the date of their article over 150 clinical trials of sepsis had been conducted in humans, almost all of them supported by promising data in mice and that all of them had failed. The authors called for abandoning the use of mouse models in sepsis research; others rejected that but called for more caution in interpreting the results of mouse studies,

drug targets for intervention.[131]

Society and culture

Economics

Sepsis was the most expensive condition treated in United States' hospital stays in 2013, at an aggregate cost of $23.6 billion for nearly 1.3 million hospitalizations.[132] Costs for sepsis hospital stays more than quadrupled since 1997 with an 11.5 percent annual increase.[133] By payer, it was the most costly condition billed to Medicare and the uninsured, the second-most costly billed to Medicaid, and the fourth-most costly billed to private insurance.[132]

Education

A large international collaboration entitled the "Surviving Sepsis Campaign" was established in 2002[134] to educate people about sepsis and to improve outcomes with sepsis. The Campaign has published an evidence-based review of management strategies for severe sepsis, with the aim to publish a complete set of guidelines in subsequent years.[86] The guidelines were updated in 2016[135] and again in 2021.[136]

Sepsis Alliance is a charitable organization that was created to raise sepsis awareness among both the general public and healthcare professionals.[137]

Research

Phenotypic strategy switches of microbes capable of provoking sepsis

Some authors suggest that initiating sepsis by the normally mutualistic (or neutral) members of the microbiome may not always be an accidental side effect of the deteriorating host immune system. Rather it is often an adaptive microbial response to a sudden decline of host survival chances. Under this scenario, the microbe species provoking sepsis benefit from monopolizing the future cadaver, utilizing its biomass as decomposers, and then transmitted through soil or water to establish mutualistic relations with new individuals. The bacteria Streptococcus pneumoniae, Escherichia coli, Proteus spp., Pseudomonas aeruginosa, Staphylococcus aureus, Klebsiella spp., Clostridium spp., Lactobacillus spp., Bacteroides spp. and the fungi Candida spp. are all capable of such a high level of phenotypic plasticity. Evidently, not all cases of sepsis arise through such adaptive microbial strategy switches.[138]

National Public Radio, leading to criticism of science by press conference from the wider medical community. Subsequent independent research failed to replicate Marik's positive results, indicating the possibility that they had been compromised by bias.[139] A systematic review of trials in 2021 found that the claimed benefits of the protocol could not be confirmed.[140] Another more recent review found that "HAT therapy significantly reduced the duration of vasopressor use and improved the SOFA score but appeared not to have significant benefits in other outcomes for patients with sepsis."[141]

Overall, the evidence for any role for vitamin C in the treatment of sepsis remains unclear as of 2021[update].[142]


References

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  50. . We hope this editorial will clarify that the qSOFA is meant to be used to raise suspicion of sepsis and prompt further action—it is not a replacement for SIRS and is not part of the definition of sepsis.
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