Year in review in Critical Care, 2004: sepsis and multi-organ failure
Critical Care volume 9, Article number: 409 (2005)
During 2004, Critical Care published a broad range of original research focused on sepsis and the multi-organ dysfunction syndrome (MODS). These studies included epidemiologic surveys, assessments of the pathogenesis of the syndrome, analyses of prognostic variables in affected patients, and new therapeutic modalities.
National rates of sepsis
In an attempt to determine country-specific rates of sepsis, three studies estimated the incidence of sepsis in the Netherlands , in Norway , and in Brazil .
van Gestel and colleagues  performed a cross-sectional survey of patients in 47 Dutch intensive care units (ICUs) using American College of Chest Physicians/Society of Critical Care Medicine consensus criteria for sepsis, severe sepsis, or septic shock . The authors estimated an incidence of severe sepsis of 0.54 cases/1000 population per year, indicating that severe sepsis accounts for 0.61% of all hospital admissions and for 11% of all ICU admissions in the Netherlands.
Flaatten  used International Classification of Diseases (ICD-10) codes in a national dataset in Norway to detect episodes of sepsis. They found an incidence of sepsis of 1.49 cases/1000 population. Among hospitalized patients, the sepsis and severe sepsis rates were 9.5 and 3.0 cases per 1000 admissions, respectively. Incidence and mortality rates rose in an age-dependent fashion.
Silva and colleagues  described the findings of the Brazilian Sepsis Epidemiological Study, a prospective cohort study of consecutive adult admissions to five Brazilian ICUs. The rates of sepsis, of severe sepsis, and of septic shock were 305, 174, and 147 cases per 1000 ICU admissions, respectively. Approximately two-thirds of septic patients met diagnostic criteria on admission, with the remainder diagnosed on subsequent days. The mortality rates of patients with the systemic inflammatory response syndrome, sepsis, severe sepsis, and septic shock were 24.2%, 33.9%, 46.9%, and 52.2%, respectively. Survival was lower in the septic patients compared with those patients without sepsis.
Diagnosis and transmission of infections
Controversy exists in the approach to diagnosing ventilator-associated pneumonia. Camargo and colleagues  assessed the utility of tracheal aspirates to diagnose ventilator-associated pneumonia in mechanically ventilated patients. Qualitative culture had the highest sensitivity in the diagnosis of ventilator-associated pneumonia but had poor specificity when compared with quantitative analysis. The bacterial yield was affected by antibiotic use. Overall, the authors concluded that quantitative assessment of tracheal secretions is superior to qualitative measures for diagnosing ventilator-associated pneumonia.
Agvald-Ohman and colleagues  investigated the colonization and transmission rate of coagulase-negative staphylococci among 20 intubated patients. On at least one occasion, 85% of subjects were colonized with coagulase-negative staphylococci and 70% appeared to have been involved in at least one transmission event of coagulase-negative staphylococci. The authors suggested that a surveillance program measuring colonization rates might provide greater insight than simply documenting clinical infections with coagulase-negative staphylococci.
In a detailed case report, Naija and colleagues  described a patient with postoperative meningitis due to Pseudomonas with serial assessments of cerebrospinal fluid from ventricular and lumbar drains. Lumbar inflammation was consistently greater (higher leukocyte count, higher protein, and lower glucose) than that seen from ventricular drains. The authors suggested that diagnosis based on ventricular cerebrospinal fluid may lead to delays in recognition.
Markers and mediators of sepsis and MODS
Attention has been focused on biomarkers that may facilitate diagnosing sepsis. In a large study of emergency department patients, Chan and colleagues  tested whether procalcitonin and C-reactive protein could discriminate between patients with and without bacterial infections. Among patients requiring admission for suspected infection, procalcitonin was significantly higher in those patients with bacteremia and septic shock. However, procalcitonin did not discriminate patients with less severe infections from those without infection. C-reactive protein did not provide information about the severity of the infection but did discriminate between those with and without an infection.
Castelli and colleagues  tested whether the association between inflammatory markers and sepsis is specific or is simply a reflection of the severity of critical illness. The authors compared 150 critically ill patients with organ failure from either infectious (sepsis) or non-infectious (trauma) causes. The mean C-reactive protein and procalcitonin levels were significantly higher in septic patients than in patients with trauma. C-reactive protein did not have an association with the severity of organ dysfunction in either group and did not increase further in trauma patients once an infection developed. Procalcitonin levels were associated with greater severity of illness in septic patients, but not in trauma patients. In the trauma group, acquired infections were accompanied by a rise in procalcitonin. The authors suggest that procalcitonin may allow early identification of trauma patients who develop infection.
In a secondary analysis of patients with severe sepsis enrolled in a phase 3 study of activated protein C, Kinasewitz and colleagues  reported the extent of coagulation abnormalities. Markers of coagulation and endothelial function were assessed at baseline in all patients and were assessed serially in patients receiving placebo. Coagulopathy was nearly universal at presentation during severe sepsis, while several inflammatory cytokines were unmeasurable in a significant proportion of patients. In the placebo-treated patients, serial measurements of hemostatic markers revealed that non-survivors had a greater level of coagulopathy at presentation and demonstrated less normalization over the first 7 days. This relationship persisted despite infection with either Gram-negative or Gram-positive organisms. This study emphasizes the profound coagulopathy that occurs in severe sepsis.
While anemia is common, little is known about erythropoietin levels in sepsis. Tamion and colleagues  measured serial renin and erythropoietin levels over 48 hours in 50 septic shock patients. The erythropoietin levels were significantly higher among non-survivors compared with survivors of septic shock. Renin levels did not vary. Unlike the normal relationship seen in survivors of septic shock, erythropoietin levels fluctuated independently of hemoglobin in non-survivors. After multivariate analysis, erythropoietin and pH were independently associated with mortality. This study suggests that sepsis-induced hematopoietic dysregulation can be a marker of poor outcome.
Studies in septic shock patients with myocardial depression have indicated that levels of c-terminal active brain natriuretic protein are elevated , but the n-terminal portion brain natriuretic protein has not been tested. Chua and Kang-Hoe  showed that n-terminal portion brain natriuretic protein levels were elevated at presentation in six patients with septic shock and myocardial dysfunction. This suggests that sepsis-induced myocardial dysfunction is an alternate reason for elevated brain natriuretic protein levels in sepsis.
Patients with alcoholism appear to develop sepsis more frequently and to have worse outcomes than non-alcoholics . In a cohort of patients with septic shock from peritonitis or pneumonia, Von Dossow and colleagues  compared the inflammatory cytokine profiles between those patients with and without alcoholism. At the onset of infection, proinflammatory cytokines (e.g. IL-8, IL-6, IL-1β) were suppressed in patients with alcoholism compared with non-alcoholics. Additionally, the rise in proinflammatory cytokines seen in non-alcoholics with the development of septic shock was absent in the alcoholic patients. This suggests that alcoholism may blunt the early proinflammatory response to infection in patients with septic shock.
Insulin and glycemia in sepsis
Rusavy and colleagues  compared energy expenditure and glucose uptake in response to insulin in non-diabetic patients with severe sepsis to healthy controls. In hemodynamically stable fasting patients (days 3–7 after sepsis onset), a two-step insulin clamp protocol was used to achieve two levels of hyperinsulinemia while maintaining normoglycemia. The basal energy expenditure was significantly higher in septic patients but the insulin-induced increase was not as dramatic as that seen in the controls. The same response was seen regarding glucose uptake, a composite measure of glucose storage and oxidation. Further study demonstrated that insulin increased glucose storage and oxidation in control subjects while it increased only oxidation in the septic patients. This suggests that the metabolic response to insulin is different in septic patients from that in normal controls.
Vriesendorp and colleagues  performed a retrospective cohort study of patients undergoing esophagectomy to determine whether glucose control was associated with the postoperative course. Glucose management was not standardized, but early enteral feeding (within 24 hours) was performed in all patients and insulin was encouraged in hyperglycemia (e.g. greater than 12 mmol/l). After adjustment for multiple surgical and patient variables, the increased mean glucose was not associated with an increased length of stay or with the occurrence of infection. The authors suggested that their findings question the relevance of intensive glucose control in all critically ill patients and may have a more important role in those with established vascular disease.
Sepsis in cancer
In a retrospective cohort study, Williams and colleagues  used International Classification of Diseases (ICD-9) codes to identify severe sepsis among patients with cancer in six state hospital discharge databases. After adjusting for age and gender, the cancer population was almost four times more likely to be hospitalized with severe sepsis (relative risk, 3.96; 95% confidence interval, 3.94–3.99) than the non-cancer population. The authors estimated 126,200 cases of severe sepsis annually in cancer patients, with the highest risk in those with myeloid leukemia. The overall hospital mortality was 52% higher for severe sepsis patients with cancer than for severe sepsis patients without cancer. Nearly 10% of the annual cancer-related deaths and 14% of the cancer-associated hospitalization costs were due to severe sepsis. An age-dependent increase in the incidence and mortality of severe sepsis was observed in the non-cancer population, but not in cancer patients.
Soares and colleagues  compared the performance of five general severity of illness scores in predicting hospital mortality with a cancer-specific score in a cohort of cancer patients requiring ICU admission. The authors evaluated patients in a dedicated oncologic ICU where almost one-half of patients are admitted emergently and where 20% have sepsis. The simplified acute physiology score (SAPS2) predicted mortality most accurately. However, the calibration of all scores was poor. The general models underestimated hospital mortality, while the cancer-specific model overestimated it. Changing demographic of patients with malignancy and newer therapies may make existing mortality prediction models obsolete.
Animal studies in the management of sepsis and MODS
Lagoa and colleagues  studied dogs to determine whether early resuscitation improved mucosal blood flow and mesenteric oxygen metabolism. Using an intravenous Escherichia coli model, the animals were randomly assigned to receive no fluid resuscitation or to receive large-volume crystalloid resuscitation. The bacterial infusion produced predictable hemodynamic and metabolic changes, marked decreases in mesenteric blood flow and increased measures of mesenteric hypoxia. While the majority of systemic variables were improved by resuscitation, the mesenteric blood flow was only partly increased by resuscitation and other markers of mesenteric perfusion were unaffected by volume infusion. Fluid replacement prevented a continued rise in the difference between gastric mucosal and arterial PCO2 (CO2 gap) values but did not restore levels to those seen at baseline. This suggests a disparity between the responses in hemodynamic measures and mucosal perfusion after volume resuscitation.
Modulation of the immune response to bacterial products has been the subject of numerous investigations in sepsis. Goscinski and colleagues  investigated the ability of tobramycin and ceftazidime to alter the inflammatory response to endotoxin infusion. Prior to endotoxin administration, piglets received intravenous tobramycin, ceftazidime, or placebo. The expected physiologic changes occurred with endotoxin infusion. There were no significant differences in circulatory, respiratory, or hematologic variables, or in endotoxin levels between the groups. After 3 hours, IL-6 levels decreased to a greater degree in the antibiotic groups than in the placebo animals but tumor necrosis factor alpha levels were not affected. This suggests that while tobramycin and ceftazidime do not neutralize endotoxin, they may have an effect on IL-6.
Vascular permeability, as measured by extravascular lung water, increases before changes in oxygenation in animal models of acute lung injury. Current methods require a double injection indicator to measure extravascular lung water. A single thermodilution technique is technically easier to perform. In a sheep model of acute lung injury, Kirov and colleagues  used a single thermodilution technique to assess extravascular lung water. The extravascular lung water measured by the single thermodilution technique was well correlated with gravimetric assessment at the postmortem examination (r = 0.85). However, it consistently overestimated the postmortem lung weight raising concerns about its specificity for diagnosing excess lung water.
Human studies in the management of sepsis and MODS
Because of its antioxidant and anti-inflammatory properties , N-acetylcysteine is an attractive agent for modulating the response to sepsis. Hein and colleagues  used a variety of techniques to assess liver perfusion, liver function, and lactate production after intravenous N-acetylcysteine (150 mg/kg) administration in five patients with respiratory failure and septic shock. After treatment with N-acetylcysteine, liver perfusion and hepatic function increased and liver lactate intensity decreased. This suggests that N-acetylcysteine increased hepatic perfusion and improved hepatic oxidative metabolism. Emet and colleagues  performed a randomized controlled trial of early N-acetylcysteine infusion in patients with severe sepsis. Patients in the N-acetylcysteine group (n = 27) received an intravenous bolus followed by a continuous infusion for 6 hours, and control subjects (n = 26) received placebo. The hospital mortality, the duration of mechanical ventilation, and the length of ICU stay were no different between the two groups. There were no significant differences between the groups in hemodynamic measures, in gastric pH, or in inflammatory markers. No significant adverse events were noted. The authors concluded that the use of N-acetylcysteine in patients with severe sepsis is not currently supported but further investigation might be warranted.
Vasoactive arachidonic acid metabolites, especially thromboxane A2 and prostacyclin, may play a role in the pathogenesis of septic shock and MODS . Memis and colleagues  conducted a randomized, placebo-controlled trial of lornoxicam, an inhibitor of cyclooxygenase, in patients with severe sepsis (n = 40). One-half of the patients received lornoxicam (8 mg intravenously every 12 hours for six doses) and one-half received placebo. There were no differences between the two groups with regard to physiologic measures, to arterial blood gas values, or to levels of inflammatory markers. There was no benefit of lornoxicam on ICU mortality, on number of ventilator days, or on ICU length of stay. No adverse events were noted.
In supporting the respiratory system of patients with acute respiratory distress syndrome, positive end expiratory pressure is often employed. Bruhn and colleagues  investigated the effect of a range of positive end expiratory pressure levels on gastric mucosal perfusion. Eight adult patients with acute respiratory distress syndrome were included. Pressure–volume curves measured by the airway occlusion technique defined ideal positive end expiratory pressure. Subjects received positive end expiratory pressure levels of 10 cmH2O, 15 cmH2O, 20 cmH2O and ideal positive end expiratory pressure for four consecutive 30-min periods. During the study, the majority of hemodynamic measures did not vary but the mean airway pressure and the PaO2/FiO2 ratio increased with increasing positive end expiratory pressure. Overall, no significant change in the CO2 gap or cardiac output was found at any of the study periods, but individual variations were noted.
Some studies suggest that early surgical intervention is associated with poorer outcomes in severe acute pancreatitis . To explore this association, De Waele and colleagues  reported their experience with 124 patients with severe acute pancreatitis at a hospital in Belgium. Forty-five percent underwent surgery, and 39.2% of these had early surgery (within 12 days of diagnosis). Using logistic regression, the authors found that early surgery was not independently associated with mortality, once adjusted for age, for sequential organ failure assessment score at the time of surgery, and for the presence of sterile necrosis. The authors suggested that the reported association between early surgical intervention and mortality may be due to a lack of adequate risk-adjusting.
Recovery from sepsis and MODS
Kerbaul and colleagues  described a cohort of 15 patients with ICU-acquired weakness following open heart surgery complicated by sepsis. The eight survivors were followed for neurologic recovery for up to 1 year. Twenty-five percent could not ambulate independently at 1 year follow-up. This was predicted by the combination of muscle and nerve pathology on biopsy and the absent nerve conduction on electrophysiologic testing. This combination, if prospectively confirmed, may identify a group of patients with a high risk for long-term disability.
Granja and colleagues  compared health-related quality of life between patients admitted to a medical/surgical ICU in Portugal for severe sepsis or septic shock with those patients admitted for reasons other than severe sepsis. Among the septic respondents, 33% reported problems with ambulation, 24% reported problems with self-care, 46% had problems with self-care, 36% had pain or discomfort, and 44% were anxious or depressed 6 months after the ICU stay. These measures were similar to the non-septic group. At the time of assessment, 33% of septic patients and 42% of the comparison patients reported their current health state was worse compared with 12 months prior to the assessment.
Physician attitudes and awareness of sepsis
Poeze and colleagues  surveyed physicians' attitudes about sepsis and their awareness of American College of Chest Physicians/Society of Critical Care Medicine consensus conference diagnostic criteria. The majority felt that sepsis was a leading cause of ICU mortality, that sepsis carried a significant financial burden, and that sepsis was a challenging condition to treat. Despite the recognition of sepsis as an important disease, only 22% of intensivists and 5% of non-intensivists gave the consensus conference diagnostic criteria when defining sepsis. Only 17% of physicians agreed on any one definition of sepsis. Fever was the only sign mentioned by a majority of respondents as a requirement to confirm the diagnosis.
intensive care unit
multi-organ dysfunction syndrome.
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The author(s) declare that they have no competing interests.
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O'Brien, J.M., Ali, N.A. & Abraham, E. Year in review in Critical Care, 2004: sepsis and multi-organ failure. Crit Care 9, 409 (2005). https://doi.org/10.1186/cc3728
- Septic Shock
- Severe Sepsis
- Septic Patient
- Severe Acute Pancreatitis