Clinical review: The liver in sepsis
During sepsis, the liver plays a key role. It is implicated in the host response, participating in the clearance of the infectious agents/products. Sepsis also induces liver damage through hemodynamic alterations or through direct or indirect assault on the hepatocytes or through both. Accordingly, liver dysfunction induced by sepsis is recognized as one of the components that contribute to the severity of the disease. Nevertheless, the incidence of liver dysfunction remains imprecise, probably because current diagnostic tools are lacking, notably those that can detect the early liver insult. In this review, we discuss the epidemiology, diagnostic tools, and impact on outcome as well as the pathophysiological aspects, including the cellular events and clinical picture leading to liver dysfunction. Finally, therapeutic considerations with regard to the weakness of the pertinent specific approach are examined.
KeywordsBile Acid Severe Sepsis Liver Dysfunction Bile Flow Intrahepatic Cholestasis
bile acid-independent bile flow
bile salt export pump
EPIdemiology of SEPSIS
International Classification of Diseases: Ninth Revision: Clinical Modification
intensive care unit
logistic organ dysfunction score
multiple organ dysfunction syndrome
plasma disappearance rate of indocyanine green
Protein C Worldwide Evaluation in Severe Sepsis
sinusoidal endothelial cell
systemic inflamatory response syndrome
sepsis-related organ failure assessment
tumor necrosis factor-alpha.
Severe sepsis and septic shock remain a thorny issue in public health care because of their high mortality rate, which has been reported to be between 30% and 50% [1, 2]. Sepsis can evolve to multiple organ dysfunction syndrome (MODS), whose severity accounts for a high mortality rate. During sepsis, liver dysfunction is one of the MODS components and usually is associated with a poor prognosis but its precise incidence remains unclear. Whereas the liver plays a pivotal role in regulating a wide range of key metabolic, homeostatic, and host-defense activities, liver dysfunction is commonly viewed only as a consequence of shock and initial tissue hypoperfusion. In fact, the injured liver may be considered one of the main actors in the genesis and amplification of multiple organ failure. However, the lack of reliable diagnostic tools does not allow detection of early liver dysfunction . This concise overview aims to describe the epidemiology and prognostic value of liver dysfunction during sepsis, then to review the pathophysiological aspects and clinical features of liver dysfunction, and finally to propose a main therapeutic axis and perspectives on specific treatment.
Septic liver dysfunction: incidence and definitions and impact on mortality
The precise incidence of sepsis liver dysfunction remains difficult to establish because of the lack of a precise and consensus definition and the various observation times. Sands and colleagues  defined liver failure as a combination of a total bilirubin level of greater than 2 mg/dL (> 34 μmol/L) and either an alkaline phosphatase or serum aminotransferase level of greater than twice the normal value. In a cohort of 1,342 episodes of sepsis syndrome, liver failure was present in 12% within 28 days of the onset of disease . Conversely, using the International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) codes, Angus and colleagues  identified 192,980 cases of severe sepsis in seven states in the US and observed hepatic failure in only 1.3%. However, this small incidence is explained by a strongly restrictive definition of liver dysfunction, including only acute and subacute necrosis of the liver and hepatic infarction. In a more recent clinical trial involving 312 patients in septic shock, acute liver failure was reported in 20% during the 72-hour period of the study treatment . This acute liver failure was defined by at least two of the following items: (a) bilirubin of greater than 2.5 mg/dL (> 43 μmol/L), (b) serum alanine transaminase concentration of more than twice the upper limit, and (c) prothrombin time of greater than 1.5 times the control value or an international normalized ratio of greater than 1.5 . The 2001 International Sepsis Definitions Conference recommended the use of scoring systems, such as the Sepsis-related Organ Failure Assessment (SOFA) score, the MODS score, or the Logistic Organ Dysfunction System (LODS) score . All of these scores aim to quantify the degree of organ(s) dysfunction(s) over the course of sepsis and use bilirubin to assess and define liver dysfunction in addition to prothrombin time for the LODS score. In this conference, sepsis liver dysfunction was defined as a plasma total bilirubin of greater than 4 mg/dL (> 70 μmol/L) , but, interestingly, this cutoff value was not proposed by any of the cited scoring systems. Except for the early phase of severe sepsis/septic shock in which an acute elevation of serum aminotransferase levels (20-fold the upper limit of normal) permits the diagnosis of hypoxic hepatitis (HH) , serum bilirubin could be assumed to be the most widely used and proposed biomarker to diagnose hepatic dysfunction/failure during sepsis. Thus, using the SOFA score, the French EPISEPSIS (EPIdemiology of SEPSIS) study group reported incidences of liver dysfunction (hepatic score of greater than 0) and liver failure (hepatic score of 3 or 4) of 46.6% and 6.3%, respectively, in 541 patients with severe sepsis during the first 24 hours after admission to the intensive care unit (ICU) . In the same population and with the same score, the PROWESS (Protein C Worldwide Evaluation in Severe Sepsis) trial reported incidences of liver dysfunction (hepatic score of 1 or 2) and liver failure (hepatic score of 3 or 4) of 35.6% and 2.75%, respectively .
Developing the MODS score, Marshall and colleagues  evaluated the association of multiple hepatic biomarkers - bilirubin, albumin, alkaline phosphatase, aspartate and alanine aminotransferases (ASAT and ALAT, respectively), and lactate dehydrogenase (LDH) - with ICU mortality rate in 692 patients to find the ideal descriptor of liver dysfunction. Unfortunately, neither a single biomarker nor a combination of variables could predict a mortality rate of greater than 50% at the highest increment of abnormality. Nevertheless, the authors selected bilirubin as the hepatic component of their score, arguing that bilirubin satisfied most of the criteria for the ideal descriptor of liver dysfunction; that is, bilirubin has a simple, routine, and reproducible dosage; is a comprehensive reflection of physiological liver function; and is readily evaluable in heterogeneous groups of critically ill patients . However, the authors mentioned the failings of this criterion (that is, its lack of specificity and its inability to reflect the full spectrum of liver dysfunction and differentiate an acute response from a pre-existing organ chronic disease) .
Some authors have argued for the use of a dynamic test, such as the plasma indocyanine green (ICG) disappearance rate (PDRICG), to assess liver function . ICG is an organic anion that is exclusively eliminated by the liver and could estimate hepatic cell function and blood flow. This technique may detect septic liver dysfunction earlier than bilirubin and seems to correlate with patient outcome but is unable to distinguish the relative contribution of hepatic blood flow alterations to hepatocellular injury [13, 14]. Moreover, an animal study questioned PDRICG as a marker of liver cell function. In hyperdynamic porcine endotoxemia, PDRICG failed to reflect liver dysfunction as neither hepatic blood flow nor PDRICG exhibited any changes over time, whereas the cumulative bile flow, biliary ICG, and bicarbonate excretion fell dramatically .
Finally, assessing liver function among critically ill patients remains challenging, and neither static nor dynamic tests can be considered a gold standard. This issue could contribute to an underestimation of the frequency and importance of sepsis liver dysfunction during the course of sepsis. Because liver dysfunction is strongly associated with mortality in patients with sepsis, the ability to accurately assess liver function is of critical interest. The EPISEPSIS study group found that the persistence or development of liver failure in the 72-hour period after the onset of severe sepsis was strongly associated with outcome . Furthermore, in the PROWESS trial, the lack of baseline liver dysfunction resolution or the development of new liver dysfunction during the first week of sepsis or both were associated with a lower 28-day survival rate . Similarly, Hebert and colleagues  found a significant increased risk of death associated with hepatic failure in patients with sepsis. In the US, mortality was higher in patients meeting the criteria of severe sepsis with hepatic dysfunction based on the ICD-9-CM . Finally, with respect to HH, the presence of septic shock is an independent predictor of overall mortality . Despite this important clinical issue, recent important trials on severe sepsis neglected to report specific data about liver function [17, 18]. These data demonstrate the critical importance of the too-often-neglected liver dysfunction in the outcome of severe sepsis and septic shock and the urgent need to improve the diagnosis and management of liver dysfunction.
The pathophysiological aspects of liver dysfunction are complex and not yet well understood. Basically, the liver has a role in endotoxin and bacteria scavenging, detoxification, and synthesizing proteins for metabolic, immune, and coagulation functions. Several cells are involved in these processes: hepatocytes (HCs), Küpffer cells (KCs), and sinusoidal endothelial cells (SECs). To ensure these functions, liver perfusion, which represents 25% of the cardiac output, is accomplished mainly by portal venous blood flow. This flow is regulated by the hepatic arterial buffer response, which aims to compensate any reduction in portal blood flow .
During the course of septic shock, the liver contributes actively to host defense and tissue repair through crosstalk between hepatic cells and blood cells. HCs will shift their metabolic pathway toward upregulation of the inflammatory response, which is responsible for an increase in the synthesis of acute-phase proteins mediated predominantly by interleukin 6 (IL-6) . This shift leads to increases in C-re active protein, α-1-antitrypsin, fibrinogen, prothrombin, and haptoglobin levels, whereas the hepatic production of albumin, transferring, and antithrombin is decreased. In addition, the upregulation of the acute-phase response inhibits the protein C pathway, and the profound changes in the balance of coagulation factors result in pro-coagulant activity in sepsis. Moreover, glucose metabolism is significantly altered because of increases in glycogenolysis and gluconeogenesis , and liver hypermetabolism, such as increased amino-acid uptake, occurs . In addition, the metabolic changes and inflammatory response lead to a decrease in biotransformation liver function, especially a reduction in cytochrome P450 activity. Thus, the elimination of endobiotic and xenobiotic compounds is considerably impaired [23, 24]. In contrast, KCs are key cells involved in scavenging bacteria and endotoxin. The liver harbors approximately 80% of all macrophages in the human body as resident KCs . Indeed, endotoxin clearance was impaired in the case of underlying liver disease, which could explain a higher susceptibility of the host to infection . KCs can produce various pro-inflammatory mediators, including tumor necrosis factor-alpha (TNF-α), known to be largely involved in systemic inflammatory response syndrome (SIRS), the enhancement of hepatic acute-phase proteins, and the production of nitric oxide (NO) . KCs also interact with blood cell components (platelets, erythrocytes, and leukocytes), promoting neutrophil recruitment in the sinusoids and enhancing the pro-inflammatory response . Hepatic injury can worsen through the adhesion of neutrophils to SECs, promoting thrombi formation in the sinusoids and impairing liver microvascular perfusion .
Cellular and molecular effects
Except for HH, several experimental data argue for an early and insidious liver dysfunction during the initial phase of sepsis. To date, however, this early liver dysfunction has not been easily detectable in clinical practice.
Effects of cytokines during liver sepsis
Effects of cytokines
Pro-inflammatory response and stimulation of IL-6 production by HCs
Pro-inflammatory response, stimulation of acute-phase proteins, and activation and release of TGF-β
Pro-inflammatory response and synergistic action with TNF-α
Anti-inflammatory response and counteracting of the extension of inflammatory response
LPS-induced liver toxicity and secretion of IFN-γ
HC apoptosis, elevation of TNF-α, and upregulation of CD14
Anti-inflammatory response and downregulation of LPS-induced IL-6 release
Another major cytokine responsible for the hepatocellular dysfunction is IL-18. This cytokine, secreted by KCs after LPS treatment, plays a critical role in LPS-induced liver toxicity. Thus, LPS can induce the production of a pro-IL-18 cytokine that needs to be cleaved into a biologically active form by caspase-1-dependent processing. After maturation, IL-18 causes the secretion by hepatic lymphocytes of interferon-gamma (IFN-γ), which is itself responsible for direct liver injury via HC apoptosis, and a second elevation of TNF-α . Interestingly, IFN-γ is al so able to upregulate the expression of the Toll-like receptor 4 , which participates in an inflammatory hyper-reactive response to LPS, leading to a potentially h armful, whole-body inflammation response. Like cytokines, reactive oxygen species participate in the liver response to LPS. Despite controversies, during the early stage of sepsis, NO is thought to be responsible for the decreased vascular resistance to maintain adequate tissue perfusion, and during the later course of sepsis, excessive NO release is responsible for generalized hypotension. The beneficial effects of NO seem to lie in the subtle control of its production by inducible NO synthase and constitutively expressed NO synthase by KCs, HCs, and SECs . The functions of NO include the maintenance of vascular integrity and hepatosplanchnic blood flow, relaxation of vascular smooth muscles, and inhibition of leukocyte adherence to endothelial cells and platelet aggregation. Low NO levels could be hepato-protective in sepsis . In response to the vasodilator effect of NO, circulating endothelin-1, a strong vasoconstrictor that is involved in the dramatic reduction of blood flow in liver sinusoids, is increased. By stimulating the shift of perisinusoidal Ito cells (also called stellate cell s) from their storage phenotype toward their activated contractile state, endothelin-1 reduces the diameters of hepatic sinusoid vessels .
Lipid mediators, such as platelet-activating factor and arachidonic acid metabolites of cyclooxygenase or lipoxygenase, can also promote direct liver injury by an imbalance in their production [30, 41]. For example, thromboxane A2 may contribute to platelet aggregation and vasoconstriction, but its contribution is probably less than that of endothelin-1, which can more potently reduce blood flow through the hepatic sinusoids .
Interestingly, an increase in gut-released norepinephrine during the early stage of sepsis has recently been shown to be involved in hepatocellular dysfunction. The activation of the α2-adrenergic pathway in KCs by this catecholamine leads to the secretion of TNF-α, IL-1β, and IL-10 [43, 44].
At the bedside, liver dysfunction is non-univocal, and two schematic clinical features may be observed: HH mainly as a result of an extrahepatic vascular event and jaundice or sepsis-induced cholestasis as the consequence of an insidious and slow intrahepatic injury. Despite sharing some similarities, these features are quite different.
HH is defined according to three criteria [8, 45]: (a) a clinical setting of cardiac, circulatory, or respiratory failure; (b) a dramatic and transient increase in serum aminotransferase activity (at least 20-fold higher than the upper limit of normal); and (c) the exclusion of other putative causes of liver cell necrosis. Septic shock with HH represents up to 32% of all HH cases in ICU patients  and can lead to fulminant hepatic failure. In cardiogenic shock, HH is secondary to decreased cardiac output and oxygen delivery. However, in septic shock, splanchnic blood flow and cardiac output are increased but not sufficient to counterbalance the high demands for oxygen and the inability of liver cells to extract oxygen . Moreover, vascular mechanisms of defense against portal blood flow reduction are altered, especially the hepatic arterial buffer response . Compromised liver hemodynamics, however, do not always lead to HH. Endotoxins and pro-inflammatory mediators could have an important role in potentiating HH development. Although the mechanisms are not fully understood, HH could result from the reoxygenation phase caused by the ischemia/reperfusion phenomenon, including oxidant stress, early activation of KCs, and secondary recruitment and activation of systemic neutrophils . The enzymatic pattern of HH starts with sharp but unsustained increases in ASAT, ALAT, and LDH levels 24 hours after the initiation of shock; decreasing levels are observed 2 or 3 days later, and normal levels are reached in approximately 15 days. The other hallmark of HH is an early and dramatic drop in prothrombin levels , which is responsible for hemorrhagic syndrome. A serum creatinine level of greater than 20 mg/L (> 177 μmol/L) was observed in 65% of HH but probably reflects the renal impairment caused by the hemodynamic failure [8, 48]. In addition, a delayed elevation of bilirubin in HH is described but, in most cases, without visible jaundice.
Jaundice or sepsis-induced cholestasis
No specific therapeutics for liver sepsis dysfunction/failure are currently available. Nevertheless, a set of recommendations could be given from the perspective of liver dysfunction/failure. Thus, sepsis liver management relies first on early goal-directed resuscitation as recommended (that is, early antibiotic therapy and infection source control, fluid resuscitation, and vasopressor support to restore perfusion in the liver and other organs as well as support for the associated organ failure) . Indeed, an appropriate hemodynamic restoration permits the restoration of liver perfusion and is an essential step in avoiding liver dysfunction. Interestingly, experimental data suggest that catecholamines could have an effect in the inflammatory response and participate in hepatic dysfunction . Corticosteroid use in septic shock is still debated, but with respect to the liver, experimental data suggest that they may have an immunomodulation effect on sepsis-induced cholestasis through the induction of hepatobiliary transporters and restoration of bile transport . Moreover, in the CORTICUS (Corticosteroid Therapy of Septic Shock) study, hydrocortisonetreated patients demonstrated a faster improvement in liver failure (SOFA hepatic score of 3 or 4) during the first week (P < 0.0001) . However, at present, the use of corticosteroids cannot be recommended for the treatment of sepsis-induced hepatic dysfunction.
For hemodynamically stable patients with a functioning gastrointestinal tract, early enteral feeding has become a recommended standard of care . Therefore, because of the potential favorable effects on the gut barrier and oxygenation, enteral nutrition (EN) should be preferred in patients with jaundice [65, 66]. EN has also been associated with decreased infection rates and fewer metabolic complications in liver disease and after liver transplant compared with parenteral nutrition . Furthermore, EN stimulates bile acid secretion and promotes the resurgence of the enterohepatic cycle . Because hypoglycemia is a frequent event in liver failure, the close monitoring of glycemic levels and careful glucose administration are required and aggressive insulin therapy should then be used with caution .
Drugs potentially inducing cholestasis or hepatocellular damage - for example, acetaminophen, non-steroid anti-inflammatory drugs, benzodiazepines, phenytoin, sodium valproate, amiodarone, antifungals, rifampicin, isoniazid, and fusidic acid - should be avoided or at least used with caution . Moreover, recent genomic studies suggest that polymorphisms in genes involved in molecule metabolism could be an interesting way to define groups of patients at risk of drug-induced liver toxicity . Because ursodeoxycholic acid, a chelator of bile acids, has cytoprotective and immunomodulatory effects, it has been used to treat cholestatic diseases (for example, primary biliary cirrhosis). These molecules could be considered for sepsis-induced cholestasis , but no data currently support such an assertion. Finally, extracorporeal liver devices have been proposed to remove endotoxins, such as by hemoperfusion with a polymixin B membrane, or to remove albumin-bound toxins, such as by the molecular adsorbents recirculating system (MARSR®; Gambro Hospal, Peterborough, UK). Their effectiveness and safety have yet to be demonstrated.
Sepsis-induced liver dysfunction is a frequent event and is strongly associated with mortality. During the past few decades, its pathophysiology, including hypoxic and cholestasis aspects, has been better understood. However, the tools to diagnose liver dysfunction earlier and more accurately remain limited. At this time, the treatment of liver dysfunction is included only in the general therapeutic steps on sepsis syndrome management. An earlier and better identification of patients with liver dysfunction is warranted and may be the way to evaluate new therapeutic strategies and further improve the prognosis of sepsis.
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