Sepsis and disseminated intravascular coagulation
© Okamoto et al. 2016
Received: 23 November 2015
Accepted: 4 March 2016
Published: 23 March 2016
Sepsis is frequently complicated by coagulopathy and, in about 35 % of severe cases, by disseminated intravascular coagulation (DIC). In Japan, aggressive treatment of septic DIC is encouraged using antithrombin and recombinant thrombomodulin. The macrophages, monocytes, and neutrophils are a source of TF and participate in the direct activation of the coagulation cascade in the early phases of sepsis. And activated factor X (FXa), which is involved in hemostasis, thrombogenesis, inflammation, and cellular immune responses, induces TF expression in human peripheral monocytes and, conversely, that inhibition of FXa activity reduces TF expression. Both inflammation and coagulation play an important role in DIC due to sepsis. In addition to inflammatory cytokines (TNF-α, IL-1 and so on), HMGB1 has recently been shown to mediate the lethal late phase of sepsis and caused coagulopathy. TM not only binds HMGB1 but also aids the proteolytic cleavage of HMGB1 by thrombin. There have been many reports of the efficacy of recombinant TM and antithrombin for treatment of septic DIC from Japan. Further investigation of the efficacy of recombinant TM and AT in countries other than Japan, as well as the monitoring of medical costs incurred during hospitalization, will help validate the use of TM and AT for treatment of septic DIC.
KeywordsSepsis Disseminated intravascular coagulation (DIC) HMGB1 Antithrombin Thrombomodulin
Sepsis is a clinical syndrome defined as a systemic response to infection. It is frequently complicated by coagulopathy  and, in about 35 % of severe cases, by disseminated intravascular coagulation (DIC) [2–4]. In the European Union and the USA, the 2012 guidelines of the Surviving Sepsis Campaign do not recommend treatment for septic DIC [5, 6]. In contrast, in Japan, aggressive treatment of septic DIC is encouraged [7–9]. It is not an exaggeration to state that Japan is one of the countries that most effectively treats patients with septic DIC. In this article, we review the mechanisms that underlie the interaction between sepsis and DIC and, by highlighting our findings, the effects of sepsis on the coagulation system.
During sepsis, inflammation diffusely activates the coagulation system, consuming multiple clotting factors and resulting in DIC [10, 11]. In systemic inflammatory response syndromes caused by infection, both perturbed endothelial cells and activated mononuclear cells produce proinflammatory cytokines that promote coagulation [12, 13]. Proteins expressed on these cells initiate coagulation. Thrombin elicits the production of monocyte chemoattractant protein 1 and interleukin (IL)-6 in monocytes, fibroblasts, and mesothelial cells, and the production of IL-6 and IL-8 in vascular endothelial cells by interacting with protease-activated receptors (PARs) 1, 3, and 4. Via PAR 2, factor Xa, and the tissue factor-VIIa complex also upregulate IL-6 and IL-8 in vascular endothelial cells [14–16]. In addition, the inhibition of physiologic anticoagulant mechanisms and fibrinolysis by endothelial cells causes intravascular fibrin deposition.
Initiation of the extrinsic coagulation protease cascade requires tissue factor (TF), a 47-KDa transmembrane glycoprotein . We reported that macrophages, monocytes, and neutrophils are a source of TF in sepsis animal models and participate in the direct activation of the coagulation cascade in the early phases of sepsis [18–20]. We also showed that activated factor X (FXa), which is involved in hemostasis, thrombogenesis, inflammation, and cellular immune responses, induces TF expression in human peripheral monocytes and, conversely, that inhibition of FXa activity reduces TF expression in an experimental model of rat endotoxemia . Our results indicate that FXa directly modulates TF expression and that both inflammation and coagulation play an important role in DIC due to sepsis. Development of a procoagulant state in sepsis, due to aberrant expression of tissue factor (TF) and sharp decrease of its major inhibitor tissue factor pathway inhibitor (TFPI), could lead to microthrombotic organ failure . TFPI is a major inhibitor of the TF-FVIIa-initiated coagulation in vivo. Tang et al.  and Gando S et al.  suggested that during early sepsis, the available TFPI might not adequately balance the increased TF-dependent coagulation activation. Moreover Tang et al. suggested that plasmin might be partly responsible for proteolytic degradation of TFPI in the early stages of sepsis.
Diagnostic criteria of septic DIC
Different diagnostic criteria of septic DIC have been established by the International Society on Thrombosis and Haemostasis , the Japanese Ministry of Health, Labor and Welfare (JMHLW) , and the Japanese Association of Acute Medicine (JAAM) .
Although the criteria of the JAAM are the most specific for septic DIC [42, 43], a prospective study in Japan found no significant differences in the odds ratios for prediction of DIC outcomes calculated on the basis of these three diagnostic criteria . As the mortality rate of DIC is still high, early diagnosis and treatment are required.
Screening assays (global coagulation tests) using scoring parameters, such as prothrombin time, fibrinogen level, platelet count, and levels of fibrin-related markers, provide important information about the degree of coagulation factor activation and consumption.
Examination of DIC scores (based on the JMHLW criteria) at the beginning of DIC treatment showed that greater treatment efficacy was achieved in pre-DIC than in DIC patients . Outcome worsened as the DIC score increased, thus suggesting that both early diagnosis and early treatment of DIC are important. To define the pre-DIC state, we prospectively evaluated global coagulation tests, hemostatic molecular markers, and the onset of DIC within a week after registration . The levels of D-dimer and FMC were significantly lower in patients with pre-DIC than in those without DIC, whereas there were no significant differences in the levels of thrombin-antithrombin complex (TAT), plasmin-α2plasmin inhibitor complex (PIC), antithrombin (AT), and thrombomodulin (TM). However, no markers that provided an appropriate cutoff value for differentiating between “pre-DIC” and “without DIC” (as do DIC scores) were identified.
Treatment of septic DIC
Common sense dictates that administration of an antibiotic that specifically targets the infection is the most important therapy in septic DIC. After administering antibiotics, surgical drainage at the infection site should be performed as soon as possible. Physicians should first administer treatment for the underlying disease when sepsis is diagnosed [4, 8].
AT is a single-stranded glycoprotein with a molecular weight of ca. 59,000. It is synthesized in the liver and inhibits the activity of thrombin and activated factors X, IX, VII, XI, and XII . Extensive clinical studies have been performed in patients with severe sepsis [48–53] to determine the appropriate dose of AT. Twenty-eight days of AT treatment did not improve the survival rate in the KyberSept trial , which was a multicenter, double-blind phase III study that included 2314 patients with severe sepsis (a total of 30,000 IU of AT was administered over 4 days). However, in a subgroup analysis, an improvement in the survival rate on day 90 was observed in patients not receiving concomitant heparin treatment; this finding agrees with the results of previous phase II studies supporting the efficacy of AT [54–58]. A recent Japanese study by Iba et al.  used a nonrandomized, multi-institutional, post-marketing survey to determine the optimal AT dose for treating septic DIC. They reported survival rates of 65.2 % in patients receiving 1500 IU/day and 74.7 % in patients receiving 3000 IU/day. A logistic regression analysis showed that the higher dose (3000 IU/day) was associated with a better survival outcome . A second survey, in which the baseline AT levels in patients with septic DIC were less than 40 %, showed a significantly higher rate of DIC resolution and a better survival outcome in patients receiving 3000 IU/day compared with those receiving 1500 IU/day . The ratio of bleeding events in the two groups was not significantly different.
We conducted a prospective, randomized, controlled multicenter trial for DIC patients with sepsis and AT levels of 50 to 80 % to test the hypothesis that concentrated administration of AT improves DIC, resulting in faster recoveries and better outcomes . Patients receiving AT for 3 days had significantly lower DIC scores and higher recovery rates than did those who did not receive AT. This finding suggests that moderate doses of AT (30 IU/kg per day) improve DIC scores, thereby increasing the recovery rate without any risk of bleeding in patients with septic DIC.
Tagami et al.  performed an analysis using information collected from a nationwide administrative database in Japan. Patients with severe pneumonia and DIC (n=9075) were divided into an AT group (n=2663) and a control (no AT) group (n=6412). Propensity score matching created a matched cohort of 2194 paired patients who did or not receive AT treatment. The 28-day mortality rate was 9.9 % lower in the AT group than in the control group. Multiple logistic regression analyses showed an association between AT use and the 28-day mortality rate (adjusted odds ratio, 0.85).
The British guidelines recommend the use of unfractionated heparin (UFH) because of its short half-life and availability of antagonists, especially in patients at a high risk of bleeding. Japanese guidelines indicate a preference for low molecular weight heparin because it proved superior in improving coagulation abnormalities and caused fewer hemorrhagic adverse events in a randomized controlled trial (RCT) conducted in DIC . In the HETRASE (A Randomized Clinical Trial of Unfractioned Heparin for Treatment of Sepsis) study , the results of which were reported after publication of the guidelines, and the efficacy of UFH for sepsis was denied. Zarychanski R et al.  reported that the risk hazard ratio for death associated with the use of heparin in septic patients was 0.88 (95 % confidence interval (CI), 0.77–1.00; I 2 = 0 %). In addition, Wang et al.  also reported a decreased mortality associated with heparin use (odds ratio = 0.656, 95 % CI = 0.562–0.765, P < 0.0001). Moreover, Iba et al.  reported that both UFH and LMWH attenuated the toxicity of histone H3, in vivo as well as in vitro, and that the effects of heparins shown in ex vivo study were independent of their anticoagulant effect. They suggested that the administration of heparin could become a treatment of choice for patients suffering from severe sepsis.
TM is an endothelial anticoagulant cofactor that plays an important role in the regulation of intravascular coagulation . It accelerates the thrombin-catalyzed conversion of protein C to activated protein C, which inhibits monocyte and macrophage activation [69, 70] and consequently suppresses the production of inflammatory cytokines such as TNF-α and IL-1β . In addition, recent studies have shown that TM binds to HMGB1 to prevent its interaction with the receptors for advanced glycation end-products . We reported that TM not only binds HMGB1 but also aids the proteolytic cleavage of HMGB1 by thrombin . These findings highlight the novel anti-inflammatory actions of TM.
In a Japanese phase III randomized control trial (RCT) in which 227 DIC patients with 125 hematological malignancies and 102 infections (sepsis) received recombinant TM or unfractionated heparin (UFH), the rate of resolution of DIC was 66.1 and 49.9 %, respectively . The rate of disappearance of bleeding was 35.2 % in the recombinant TM group and 20.9 % in the UFH group, and the 28-day mortality rate was 28.0 and 34.6 %, respectively. In an analysis of 80 patients with infectious DIC, the rate of resolution of DIC was 63.2 % in the UFH group and 73.2 % in the recombinant TM group . In an international phase II RCT of 750 septic patients with suspected DIC, the 28-day mortality rate was 17.8 % in the recombinant TM group and 21.6 % in the placebo group ; there was a tendency toward a low rate in the TM group, although the difference was not significant (P = 0.273). An international phase III clinical trial evaluating the efficacy of TM in patients with severe sepsis and coagulopathy is ongoing in the USA, South America, Asia, Australia, the European Union, and other countries (https://clinicaltrials.gov/ct2/show/NCT01598831?term=ART-123&rank=2).
On the other hand, Tagami et al.  found that recombinant TM was not an effective treatment for sepsis-associated DIC following severe pneumonia. This conclusion was based on propensity scores and an instrumental variable analysis of information obtained from the Japanese Diagnosis Procedure Combination (JDPC) inpatient database, a nationwide administrative database. No significant difference in the 28-day mortality rate was documented between the two groups in a propensity-matched analysis.
We also evaluated the efficacy of recombinant TM for DIC using the JDPC database [78–80]. We found that the frequency of use of AT, heparin, and protease inhibitors decreased from 2010 to 2012 in Japan, while that of recombinant TM significantly increased (25.1, 43.1, and 56.8 % in 2010, 2011, and 2012, respectively; P < 0.001). Logistic regression analysis showed that the study period was associated with the use of recombinant TM in patients with DIC. The odds ratio (OR) was 2.34 (95 % confidence interval [CI], 2.12–2 to 58; P < 0.001) in 2011 compared with 4.34 (95 % CI, 3.94–4.79; P < 0.001) in 2012. Large hospital size was the most significant factor associated with the use of recombinant TM in patients with DIC (OR, 3.14; 95 % CI, 2.68–3.66; P < 0.001). The use of recombinant TM has dramatically increased, and a large hospital size was significantly associated with increased use from 2010 to 2012 in Japan. We found no significant difference in the in-hospital mortality rate between patients receiving AT and recombinant TM. However, the administration of recombinant TM was significantly associated with lower hospitalization times and medical costs during hospitalization.
This review discussed the mechanisms that underlie the interaction between sepsis and DIC and the effects of sepsis on the coagulation system, as highlighted by our data. Further investigation of the efficacy of recombinant TM and AT in countries other than Japan, as well as the monitoring of medical costs incurred during hospitalization, will help validate the use of TM and AT for treatment of septic DIC.
damage-associated molecular patterns
disseminated intravascular coagulation
activated factor X
high-mobility group box-1
Japanese Association of Acute Medicine
Japanese Diagnosis Procedure Combination
Japanese Ministry of Health, Labor and Welfare
pathogen-associated molecular patterns
plasmin-α2plasmin inhibitor complex
randomized control trial
tumor necrosis factor
This study was supported in part by research grants from the Japanese Ministry of Health, Labour and Welfare and the Japanese Ministry of Education, Science, Sports and Culture.
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