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2023 Update on Sepsis and Septic Shock in Adult Patients: Management in the Emergency Department

Matteo Guarino, Benedetta Perna, Alice Eleonora Cesaro and 4 more

Journal of Clinical Medicine · 2023 · Review · CC BY

doi:10.3390/jcm12093188

Abstract

Background: Sepsis/septic shock is a life-threatening and time-dependent condition that requires timely management to reduce mortality. This review aims to update physicians with regard to the main pillars of treatment for this insidious condition. Methods: PubMed, Scopus, and EMBASE were searched from inception with special attention paid to November 2021–January 2023. Results: The management of sepsis/septic shock is challenging and involves different pathophysiological aspects, encompassing empirical antimicrobial treatment (which is promptly administered after microbial tests), fluid (crystalloids) replacement (to be established according to fluid tolerance and fluid responsiveness), and vasoactive agents (e.g., norepinephrine (NE)), which are employed to maintain mean arterial pressure above 65 mmHg and reduce the risk of fluid overload. In cases of refractory shock, vasopressin (rather than epinephrine) should be combined with NE to reach an acceptable level of pressure control. If mechanical ventilation is indicated, the tidal volume should be reduced from 10 to 6 mL/kg. Heparin is administered to prevent venous thromboembolism, and glycemic control is recommended. The efficacy of other treatments (e.g., proton-pump inhibitors, sodium bicarbonate, etc.) is largely debated, and such treatments might be used on a case-to-case basis. Conclusions: The management of sepsis/septic shock has significantly progressed in the last few years. Improving knowledge of the main therapeutic cornerstones of this challenging condition is crucial to achieve better patient outcomes.

Full text

From PubMed Central, U.S. National Library of Medicine, as current on Oct 20, 2026. Paragraph numbers are ours, so an answer can point at one.

1. Introduction

1Sepsis is defined as a life-threatening organ dysfunction caused by a dysregulated host response to infection. Septic shock should be considered a subset of sepsis in which underlying circulatory, cellular, and metabolic abnormalities contribute to a greater risk of mortality than that posed by sepsis alone. Both sepsis and septic shock represent a major growing global burden and a challenge for emergency physicians because of their increasing incidence and great pathophysiological, molecular, genetic, and clinical complexity. The incidence of sepsis and septic shock has continuously increased since the first consensus definition (Sepsis-1) in 1991, reaching around 49 million cases of sepsis and 11 million sepsis-related deaths worldwide in 2017. These data led the World Health Organization (WHO) to declare sepsis a global health priority. This alarming increase in incidence can be attributed to different factors: (i) the advanced average age among patients, especially in western countries; (ii) the increased number of invasive procedures; (iii) the wide usage of immunosuppressive drugs and chemotherapy; and (iv) antibiotic resistance. Despite significant advancements in therapeutic management, septic patients have a high risk of in-hospital mortality (IHM), accounting for approximately 20% of all-cause deaths globally, rendering this combined ailment one of the highest-mortality conditions encountered in the emergency department (ED).

2The frequency of identifiable microorganisms in sepsis/septic shock has varied over time, with a current preponderance of Gram-positive bacteria and an increased clinical and epidemiological significance of fungal sepsis. Among the Gram-positive bacteria, the most frequently isolated pathogens are Staphylococcus aureus and Streptococcus pneumoniae, whereas among the Gram-negative bacteria, those most commonly identified are Escherichia coli, Klebsiella, and Pseudomonas spp. Among the fungal infections associated with the condition, the predominant role is played by Candida spp., which can often be identified in immunosuppressed or neoplastic patients undergoing long-term treatment with chemotherapeutic and immunosuppressive drugs. The main sites of infection related to sepsis are the respiratory tract/pulmonary parenchyma (43%); the urinary system (16%); the abdomen (14%); the head, which is associated with a fever of unknown origin (FUO) (14%); and other sites/causes (13%).

3From a pathogenetic standpoint, sepsis is currently considered the result of several mechanisms that simultaneously involve a wide range of pro- and anti-inflammatory mediators. Furthermore, sepsis-related cellular modifications have recently been defined, and the importance of microcirculation has been emphasized in the progression from sepsis to septic shock. In this context, the endothelium has been identified as the fundamental functional unit in the pathophysiology of sepsis due to its role in the regulation of microcirculation and the modulation of coagulation mechanisms and inflammatory and anti-inflammatory signaling processes. The glycocalyx is a component of the endothelial membrane consisting of proteoglycans and glycoproteins. It mediates different functions, such as the construction of a mechanical barrier regulating vascular permeability, the activation of leukocytes and platelet adhesion, and the modulation of the inflammatory/anti-inflammatory response. Damage to the glycocalyx’s morpho-functional integrity (known as “glycocalyx shedding”) can occur due to oxidizing agents, cytokines, exotoxins, and bacterial endotoxins. This event leads to leukocyte diapedesis and increased vascular permeability with the production of oedema, which raises interstitial pressure and worsens tissue perfusion.

4According to the third international consensus on sepsis and septic shock (Sepsis-3), sepsis should be suspected in patients with infections stemming from any infective source. In these subjects, a quick Sequential Organ Failure Assessment (qSOFA) should be considered, for which a result ≥ 2 indicates patients who are at higher risk of in-hospital death. However, the 2021 guidelines discourage the use of qSOFA as the sole screening tool, recommending the use of the National Early Warning Score (NEWS) or systemic inflammatory response syndrome (SIRS) score instead due to their better sensitivity vs. qSOFA in predicting patient’s outcome. A diagnosis of sepsis is confirmed in the case of a Sequential Organ Failure Assessment (SOFA) score ≥ 2. Septic shock is defined by the need for a vasopressor to maintain a patient’s mean arterial pressure (MAP) ≥ 65 mmHg and serum lactate level ≥ 2 mmol/L. Based on this background, we wrote the present review to provide emergency physicians with a thorough update on the management of sepsis and septic shock, focusing on each pillar of the pharmacological approach to these conditions.

2. Search Strategy

5PubMed, Scopus, and EMBASE were searched from inception with particular attention to the November 2021 (release date of latest sepsis guidelines)–January 2023 period. The search terms used were “sepsis” OR “septic shock” AND “adult” AND “management” OR “therapy” AND “Emergency Department”. In addition, we expanded our analysis through a manual search of the references of the included studies and previous reviews.

3. Main Text

6The following paragraphs will detail the main aspects of sepsis/septic shock management.

3.1. Antimicrobials

7Antimicrobial therapy is the first pillar of sepsis/septic shock treatment. The administration of a prompt, empiric, antimicrobial therapy at the time of sepsis’s identification and after the collection of the appropriate cultures is a crucial step in pharmacological management. Microbiological samples should be assessed as soon as possible on admission to the ED and include blood and fluid or tissue from other sites deemed proper based on a clinical evaluation (e.g., urine or cerebrospinal fluid). Indeed, particularly in cases of septic shock, every hour of delay is associated with a significant increase in mortality. The choice of empiric antimicrobial therapy based on clinical (i.e., site of infection, previous antibiotic use, immunosuppression, and risk factors for resistant organisms) and epidemiological criteria is fundamental. Initially, regarding septic shock, multidrug antimicrobial regimens with a wide spectrum of activity should be used (e.g., carbapenems and anti-Gram-negative antimicrobials with dual coverage). Dual coverage for Gram-negative organisms might be appropriate in cases of high suspicion for multidrug-resistant organisms (e.g., Pseudomonas aeruginosa or Acinetobacter baumanii). Dual coverage for Gram-positive organisms and methicillin-resistant Staphylococcus aureus (MRSA) should be considered for patients with a high risk of infection due to these pathogens. Since efficacy depends on the peak of the antimicrobic blood level and the length of time during which this level remains above the minimum inhibitory concentration (MIC) for the identified pathogen, appropriate drug dosing is crucial. An initial loading dose may be the best strategy to achieve a therapeutic blood level more rapidly, with further dosing based on renal/liver function and consultation with an infectious disease physician. Furthermore, antimicrobial treatment should be re-evaluated daily with the aim of a correct de-escalation as soon as the results of cultural tests are available. The choice of the most appropriate empiric antimicrobial therapy is often challenging; therefore, it might be useful to consider several risk factors for pathogens that most commonly appear as etiological agents of sepsis (Table 1).

8However, the urgent need to establish antimicrobial treatment should be carefully pondered in terms of potential harm related to drugs administered to patients without an infection. Different studies have proposed comparisons between 1 h vs. 3 h bundles with respect to antimicrobial administration. Current guidelines propose the administration of antimicrobials immediately, ideally within 1 h, in patients for whom sepsis is highly suspected with/without shock or when sepsis is possible and shock is detectable. In cases with a low-to-moderate risk of sepsis without signs of shock, the administration of antimicrobials is recommended within 3 h if concern for infection persists and after performing an assessment of infectious vs. non-infectious causes.

9Procalcitonin (PCT), a peptide precursor of calcitonin, is widely used for differentiating bacterial vs. non-bacterial infections or other inflammatory conditions. In the last few years, different authors have proposed PCT as a marker to guide physicians in terms of starting antimicrobial treatment in patients with an unclear clinical presentation. However, as expressed in SSC guidelines, PCT associated with clinical evaluation was less effective than clinical evaluation alone with respect to deciding when to start antimicrobials. Recently, presepsin (PSP), a soluble N-terminal fragment of the cluster of differentiation marker protein 14 (CD14), has been proposed as an alternative biomarker to PCT because of its higher accuracy in the identification and prognostic prediction of sepsis/septic shock. However, because of higher costs and lower laboratory availability, PSP remains less tested than PCT.

10Since any antimicrobial administration should be based on local epidemiology, we propose a model that provides a summary of the main antibiotic therapies according to the infection site (Table 2). As described above, for patients with septic shock, it might be advisable to start with multi-antimicrobial regimens with a wide spectrum of activity (as indicated in the last two columns of Table 2). Moreover, the use of echinocandins (e.g., caspofungin) may be considered in suspected febrile invasive candidiasis or other potentially life-threatening mycoses, particularly with respect to immunocompromised patients. Considering the duration of empirical antimicrobial treatments, various randomized clinical trials (RCTs) have shown no differences in mortality between short- vs. long-term therapies, which has provoked the surviving sepsis campaign (SSC) to recommend shorter treatments. Furthermore, there is direct evidence that PCT should guide treatment duration.

Emergency Physician’s Point of View

11Appropriate cultural samples are required before antibiotic therapy is started. This treatment should be based on clinical/epidemiological criteria and be administrated promptly, ideally within 1 h. A frequent re-assessment of patients’ condition and PCT levels is advisable to plan an adequate reduction strategy. When possible, short courses of antimicrobial treatments may be indicated.

3.2. Fluids

12The second pillar of treatment is fluid resuscitation. Sepsis is accompanied by severe vasoplegia, which is secondary to the shedding of the glycocalyx, an affliction that may lead to distributive shock. The effective support of hemodynamic functions is essential for the survival of patients with sepsis/septic shock. In the past, the “ideal” treatment for a septic patient was based on massive volume replenishment. Recently, this approach has been questioned. Indeed, due to hemodynamic uncoupling, microcirculation perfusion does not necessarily improve with the stabilization of cardiovascular parameters; moreover, glycocalyx abnormalities and endothelial dysfunction can even be worsened by aggressive treatments.

3.2.1. Type of Fluids

13The two main types of resuscitation fluids are isotonic crystalloids and colloids. The following paragraphs will describe the main features of these therapies.

Crystalloids

14Crystalloids are divided into two main categories (i.e., chloride-rich solutions and balanced crystalloids); according to the previous guidelines, they should be considered the fluids of choice in patients with sepsis/septic shock. The administration of balanced crystalloids for the fluid resuscitation of septic patients is preferable for two reasons: (i) they have an electrolytic composition closer to that of plasma, and (ii) chloride-rich solutions are associated with a high risk of hyperchloremic acidosis (especially in large volumes). To date, the volume of fluids to be infused in a septic patient in the early stages of treatment is largely debated and, therefore, remains incompletely defined. Further discussion about the amount of fluid will be discussed in a separate section given below.

Colloids

15In the past, the fluids of choice were colloids (e.g., hydroxyethyl-starch (HES), gelatines, and dextrans), as higher-weight molecules were thought to reduce extravascular leakage and increase long-term intravascular volume. However, since the integrity of the glycocalyx is altered in septic patients, the actual intravascular volume of these fluids is apparently less than expected. Moreover, no data have consistently demonstrated the superiority of colloids over crystalloids with respect to reducing mortality for sepsis. Different studies have highlighted an increased risk of tubular necrosis and acute kidney injury (AKI) after treatment with colloids. Therefore, the safety committee of the European Medicines Agency (EMA) has recommended that authorization of the marketing of HES solutions should be suspended in Europe.Albumin

16Albumin

17The use of albumin in sepsis treatment has been largely debated. Despite the theoretical advantage of albumin over crystalloids in maintaining oncotic pressure, multiple RCTs and meta-analyses have reported that albumin infusion did not improve either short- or long-term mortality.

3.2.2. Amount of Fluids

18The total amount of fluid that should be administered in septic patients for proper resuscitation is still debated. The SSC suggests (but previously strongly recommended) treating septic subjects with at least 30 mL/kg of intravenous (IV) crystalloids within the first 3 h. This volume has been strongly debated in the last years, for which the common conclusion was to perform an individualized treatment targeted toward “glycocalyx resuscitation” according to fluid tolerance (FT) and fluid responsiveness (FR). FT can be expressed as the degree to which a patient can tolerate the administration of fluids without the onset of organ dysfunction. FR is commonly defined as a stroke volume (SV) increase of at least 10% following a fluid bolus of 200–500 mL in 10–15 min. Furthermore, there are different articles of evidence in the literature showing that fluid overload can damage the glycocalyx, leading to poor clinical outcomes. In the last few years, different methods have been proposed to establish and monitor FR (e.g., passive leg raise SPLR), SV, and the collapsibility index of inferior vena cava (CI-IVC)), but a consensus has not yet been reached. However, the general agreement among experts favors the use of dynamic tools instead of static ones. Similarly, the main resuscitation endpoints are progressively evolving toward restoring microcirculation. In 2018, Perner et al. proposed an individualized fluid treatment based on a repeated bolus of 250–500 mL of IV crystalloids with the continuous monitoring of FR and the early administration of vasopressors if circulation fails to improve. However, a recent RCT demonstrated that the restrictive vs. liberal fluid strategies did not significantly differ in terms of 90-day mortality among patients with sepsis-induced hypotension.

Emergency Physician’s Point of View

19Balanced crystalloids are the fluid of choice. Since it is impractical to standardize the amount of fluid according to each patient, an individualized strategy of resuscitation based on FT and FR is preferable. Since the clinical evidence is equivocal and no differences have been shown with respect to restrictive vs. liberal fluid strategies, we consider it to be reasonable to adopt an approach based on small and repeated boluses (250–500 mL) of crystalloids with continuous hemodynamic monitoring to avoid fluid overload.

3.3. Vasoactive Agents

20The use of inotropic drugs represents one of the cornerstones of septic shock treatment. The pathogenesis of this severe and life-threatening condition is closely related to the loss of vasomotor tone with consequent systemic vasodilation and hypotension. Since an MAP of 60 to 65 mmHg is considered a threshold for an increased risk of morbidity and mortality, the SSC recommends an MAP target of 65 mmHg and indicates norepinephrine (NE) as the first-choice drug. Recent RCTs have proposed a “permissive hypotension” (MAP 60–65 mmHg) in patients ≥65 years with septic shock showing no differences in 90-day mortality, whereas higher blood pressure values (≥65 mmHg) do not seem to add further benefits.

21NE is an α-1/β-1 adrenergic agonist that predominantly manifests its effects at the vascular level, enhancing vascular filling pressure and redistributing blood flow via its venoconstrictive effect. In addition, it improves myocardial contractility and cardiac output (increasing preload) while having a minor impact on heart rate. Ideally, an inotropic drug assessment should occur within the first hour if fluid infusion alone is not sufficient to reach the desired MAP. Various studies have demonstrated that early NE administration (at a dose of 0.1–1.2 μg/kg/min) may improve the outcomes of septic patients, although the results remain controversial. In particular, it has been shown to be effective in shortening length of stay (LOS) and reducing mortality. Since the β-adrenergic component of cardiomyocytes has not yet been altered in the early stages of shock, prompt NE infusion improves coronary perfusion by increasing atrial diastolic pressure. In addition, early inotropic administration seems to successfully resuscitate microcirculation, with a consequent improvement in tissue perfusion and oxygenation. Finally, through its vasoactive effects on peripheral circulation, NE allows for the administration of a smaller crystalloid amount, thus circumventing the risk of fluid overload.

22Vasopressin (VP) may be considered a second-line choice for septic shock treatment. According to the SSC’s recommendations, it can be administered (at a dose of 0.25–0.5 μg/kg/min) in addition to NE to obtain the target MAP by decreasing the dosage of the latter and reducing the side effects due to adrenergic overload. Furthermore, two randomized studies have shown that its efficacy (when used alone) is greater than that of NE in less-severe cases of septic shock, thereby facilitating the earlier attainment of the pressure target. The goal is not only to resuscitate the cardiovascular system but also to limit the side effects due to adrenergic overload. However, two recent meta-analyses assessing the effect of VP administration concluded that its early initiation was not associated with a decrease in short-term mortality, a shorter ICU length of stay, or LOS, but can reduce the use of renal replacement therapy (RRT).

23Epinephrine should be considered as a third-line treatment for septic shock, and its use should be limited to those cases with inadequate MAP levels despite NE and VP administration. As for VP, it can be used concomitantly with NE. Due to its important β-adrenergic effect, the use of epinephrine is indicated to a greater extent in cases of cardiac dysfunction. Furthermore, its administration may lead to more side effects than those induced by NE (e.g., tachycardia, tachyarrhythmia, and increased blood lactate concentrations.

24Many authors have proposed early vasopressor administration in patients with septic shock, even in pre-hospital settings. The results are still debated, although it seems that early NE treatment might reduce fluid overload and improve patients’ outcomes.

Emergency Physician’s Point of View

25Vasopressors should be administered in cases of an MAP < 65 mmHg despite fluid replacement. NE (at a dose of 0.1–1.2 μg/kg/min) is the drug of choice for septic patients, and its early administration could prevent fluid overload, thus reducing mortality. VP (at a dose of 0.25–0.5 μg/kg/min) might be associated with NE when target MAP is not achieved.

3.4.1. Oxygen

26Oxygen represents the most common treatment administered to any patient with a medical emergency, including those with sepsis/septic shock. In clinical practice, oxygen is overused, often leading to hypoxemia, which may negatively impact patients’ survival. While several studies have demonstrated a correlation between hypoxemia and increased mortality in patients who have suffered from a stroke, traumatic brain injury, or cardiac arrest, this relation is not clear in subjects with sepsis/septic shock. The latest SCC guidelines do not provide any recommendations for the preferential use of oxygen therapy or targets (generally defined as PaO2 55 to 70 mmHg; SpO2 88 to 92%) for adults. A recent meta-analysis concluded that there is low/very low evidence regarding an optimal oxygenation strategy for acutely ill adults. However, only two out of the fifty analyzed trials included patients with sepsis/septic shock.

3.4.2. Ventilation

27Since the publication of SSC guidelines, no new data regarding the benefit of non-invasive ventilation (NIV) over mechanical ventilation (MV) have been collected or reviewed; thus, no updated recommendations can be provided. Two recent systematic reviews explored the use of low-tidal-volume ventilation (LTVV), proposing a reduction in tidal volume from 10 to 6 mL/kg for septic patients at the ED. Both studies concluded that the use of LTVV is associated with improved clinical outcomes for mechanically ventilated ED patients. However, an individualized and cautious ventilatory approach should be considered for patients with severe metabolic acidosis. Moreover, the application of elevated intrathoracic pressure from NIV/MV can have a significant effect on cardiovascular function, reducing venous return and, consequently, cardiac output. Therefore, to avoid this effect, the use of a high-flow nasal cannula (HFNC) has been proposed for patients with sepsis and acute hypoxic respiratory failure.

3.4.3. High-Flow Nasal Cannula

28An HFNC provides heated and humidified oxygen at high flow rates, generating low levels of positive pressure in the upper airways. Treatment with an HFNC induces multiple effects, including increased oxygenation, lower respiratory rates, and reduced inspiratory effort, thus improving survival rates for patients with acute hypoxic respiratory failure.

29Despite the increasing use of HFNCs for critically ill patients, there are no consistent data on their efficacy with respect to sepsis/septic shock as their use was quite limited when the SCC guidelines were issued. Despite the low quality of the evidence, the SSC suggested HFNC application rather than NIV in septic patients with acute hypoxic respiratory failure. Recent data support the use of an HFNC in this subset, especially during weaning phases from mechanical ventilation or when preventing reintubation. However, Kim et al. emphasized the need for close patient monitoring since an HNFC may fail to prevent intubation or increase survival rates.

Emergency Physician’s Point of View

30Oxygen therapy should be started at 15 L/min via a reservoir mask and titrated to aim toward SpO2 94–98% or SpO2 88–92% if the patient is at risk of hypercapnic respiratory failure (e.g., they have a history of chronic obstructive pulmonary disease, severe obesity, etc.). For patients on NIV/MV, we suggest a low tidal volume (6 mL/kg). An HFNC may be successfully used in septic patients with hypoxic respiratory failure.

3.5.1. Heparin

31Since critically ill patients are at high risk for deep vein thrombosis and pulmonary embolism, heparin should be included in the treatment of these cases. Furthermore, sepsis/septic shock might induce disseminated intravascular coagulation, a life-threatening complication characterized by the suppression of fibrinolysis, which often leads to multiple organ failure. The SSC guidelines strongly recommended venous thromboembolism (VTE) prophylaxis via administrating low-molecular-weight heparin (LMWH) instead of unfractionated heparin (UFH). Furthermore, various studies have proven that heparin can induce other significant effects (i.e., anti-inflammatory effects, anti-complemental activation, and the modulation of various proteases) rather than solely prophylaxis (via anti-coagulation) in septic patients sepsis. Moreover, there is increasing evidence suggesting that heparin might mitigate pulmonary hypertension by interrupting neutrophil adhesion to the lung endothelium, thus reducing neutrophil migration into the interstitial space (which ultimately leads to decreased edema). Mechanical VTE prophylaxis should be considered in patients with sepsis/septic shock for whom pharmacologic prophylaxis is contraindicated. To date, no evidence on the use of direct oral anticoagulant treatment in VTE prophylaxis has been produced.

Emergency Physician’s Point of View

32VTE prophylaxis should be administered to sepsis/septic shock patients, preferably using LMWH (rather than UFH); mechanical prophylaxis may be advised for the treatment of patients with absolute contraindications to heparin treatment.

3.5.2. Insulin

33Stress hyperglycemia, due to increased glucocorticoid and catecholamine release and insulin resistance, is a common effect and may worsen septic patients’ outcome. In critically ill patients, insulin infusion should always be selected over oral anti-diabetic treatments. Rim et al. evaluated the risk of sepsis among patients treated with different oral hypoglycemic therapies and showed that metformin, compared to meglitinides and various inhibitors (sodium-glucose cotransporter-2, alpha-glucosidase inhibitors, and dipeptidyl-peptidase 4), was associated with a lower risk of hospital admission for infection. Since septic patients often show frequent variations in glycemic values, the use of a careful monitoring strategy is advisable.

Emergency Physician’s Point of View

34According to the SSC guidelines, glycemic control (with a glucose target between 144 to 180 mg/dL), preferably via insulin administration, is highly recommended for septic patients.

3.5.3. Proton Pump Inhibitors

35In its 2016 guidelines, the SSC strongly recommended the use of stress ulcer prophylaxis for septic patients. This recommendation was downgraded in 2021 because of weak evidence regarding the benefit–risk ratio. Various studies have demonstrated that proton pump inhibitors (PPIs) do not significantly improve critical patients’ prognosis, leading to a modest reduction in gastrointestinal (GI) bleeding. Furthermore, Huang et al. proved that among adult septic patients at risk for GI bleeding or stress ulcers, PPI treatment, with more than histamine-2 receptor blockers, increased rates of in-hospital mortality, bleeding, and pneumonia. A recent meta-analysis reported that PPIs in hospitalized patients were associated with recurrent Clostridioides difficile infections. Although adverse effects have been reported in critically ill patients, the evidence that has accumulated thus far is not strong enough to discourage the use of PPIs in sepsis treatment. In addition, stress ulcer prophylaxis is inexpensive, requires limited resources, and is abundantly applicable (even in low-income countries).

Emergency Physician’s Point of View

36The current evidence does not provide any further information about PPI assessment for stress ulcer prophylaxis in patients with sepsis/septic shock. Therefore, in line with the SSC’s guidelines, PPI treatment should be pursued.

3.5.4. Renal Replacement Therapy

37Acute kidney injury (AKI) is defined as an increase in serum creatinine by ≥0.3 mg/dL within 48 h or by ≥1.5 mg/dL from the baseline values within the previous 7 days or a decrease in urine volume < 0.5 mL/kg/h after 6 h, and it should be stratified for severity according to serum creatinine or urine output. AKI is a common complication affecting about 40% and up to 64% of septic and septic shock patients, respectively, thus increasing mortality rates. RRT is commonly required in septic AKI associated with other absolute indications for dialysis (e.g., severe metabolic acidosis, refractory fluid overload, electrolyte imbalance, and uremic complications). RRT techniques include continuous RRT and intermittent hemodialysis (IHD); however, which one is the best modality for optimal RRT in septic AKI remains unsettled. Since high-quality RCTs and meta-analyses have reported contradictory results, the timing of RRT initiation is still controversial. So far, there has only been one RCT incorporating septic patients with AKI, which concluded that there is no significant difference in overall mortality at 90 days between patients who had undergone early vs. delayed RRT. The CRTSAKI Study (Continuous RRT Timing in Sepsis-associated AKI in ICU), comparing early vs. delayed RRT strategies with respect to the outcomes of patients with septic AKI in the ICU, is in progress, and the results are eagerly awaited.

Emergency Physician’s Point of View

38Even though AKI is a common complication in septic patients, sepsis alone is not an indication for RRT. Thus, we suggest referring to specific AKI guidelines for this highly debated issue.

3.5.5. Steroids

39Since a pro-inflammatory state and the cytokine cascade are thought to contribute significantly to the manifestation of sepsis, various studies have proposed the use of steroid treatments; however, the data supporting the use of these drugs remain inconclusive. So far, only hydrocortisone (at a dose of 200 mg/die) has been suggested by the SSC for adult septic shock patients not reaching the target MAP despite vasopressor administration. In a recent meta-analysis involving over 9000 subjects, Fong et al. showed that a glucocorticoid shortened the time to the resolution of septic shock and the duration of MV while not affecting LOS or mortality. Notably, the combination of a glucocorticoid and fludrocortisone improved short- and longer-term mortality.

Emergency Physician’s Point of View

40Despite the role of steroids emphasized by Fong et al., the routine table use of glucocorticoids (alone or in combination with fludrocortisone) in septic shock management is not adequately supported by the current evidence. The use of hydrocortisone may be considered for patients with a vasopressor-resistant, inadequate MAP.

3.5.6. Sodium Bicarbonate

41Sepsis and septic shock may induce acidosis through different pathophysiological mechanisms, which mainly lead to lactic or metabolic acidosis. The role of sodium bicarbonate in these conditions has been largely debated, but no clear results have been obtained. In particular, the role of bicarbonate therapy in patients with lactic acidosis is controversial. Most experts believe that this treatment is appropriate in cases of severe lactic acidosis with acidemia (arterial pH < 7.1) which may lead to hemodynamic instability as a result of reduced left ventricular contractility, arterial vasodilation, and impaired responsiveness to catecholamines.

42The clinical impacts and treatment of severe acute metabolic acidosis caused by sepsis/septic shock remain controversial, and experts disagree about the indications for the use of sodium bicarbonate.

43A recent study by Zhang et al. involving a total of 1718 septic patients with metabolic acidosis subdivided into two subgroups (i.e., 500 subjects treated with sodium bicarbonate vs. 1218 untreated) showed that the treated patients did not present decreased mortality. However, an improvement in the survival of septic patients with AKI stage 2 or 3 and severe acidosis was observed. Based on the most recent studies, most physicians agree that the treatment of metabolic acidosis should be initiated when bicarbonate levels are <5 mEq/L and pH is <7.1. Bicarbonate therapy in patients with less severe acidosis (pH 7.1 or greater) is not recommended unless the patient also has severe acute kidney injury. In this regard, a multicenter, open-label, randomized controlled phase 3 trial proposed that early sodium bicarbonate infusion would result in lower 28-day mortality from any cause and lower organ failure incidence at 7 days after ICU admission for patients with severe metabolic acidemia. The study was performed by screening 26 ICUs and enrolling 389 patients in an intention-to-treat analysis (194 in the control group and 195 in the bicarbonate group). The authors concluded that sodium bicarbonate had no effect on reducing 28-day mortality or 7-day risk of organ failure; nonetheless, the treatment seemed to decrease the need for RRT and the a priori defined mortality of patients with AKI.

Emergency Physician’s Point of View

44Despite controversial evidence, sodium bicarbonate is a reasonable treatment for septic patients with severe metabolic/lactic acidosis (bicarbonate levels <5 mEq/L and/or pH < 7.1) or an AKI stage 2 or 3. Therefore, this therapy should be indicated as a bridge to be crossed before the main pillars of treatment begin to be effective.

3.5.7. Acetaminophen

45This drug effectively reduces temperature in non-neurocritical ill patients but does not change mortality or other outcomes; therefore, it should not be considered one of the main pillars of sepsis treatment.

Emergency Physician’s Point of View

46Acetaminophen is not considered a pillar of sepsis treatment and should be administered as a symptomatic drug.

4. Conclusions

47Sepsis is a life-threatening and time-dependent condition that is still accompanied by an overall poor prognosis. Several reasons may be advocated to explain why sepsis and septic shock challenge emergency physicians in daily practice, including (i) its insidious clinical onset; (ii) misdiagnosis leading to delayed treatment and subsequent worsening of clinical outcomes and quality of life; and finally (iii) multidisciplinary and challenging management with different therapeutic aspects that are still debated, e.g., the time until antimicrobic treatment, adequate fluid resuscitation, early vasopressor administration, and oxygen targets. Nonetheless, a well-orchestrated treatment based on selected antimicrobics, fluids, oxygen, and, if necessary, vasoactive agents can improve patients’ outcomes. Taken together, the data presented in this review on sepsis management (summarized in Table 3) provide a strong basis for minimizing the current unmet needs of this severe condition.

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