- Open Access
Potential survival benefit of polymyxin B hemoperfusion in patients with septic shock: a propensity-matched cohort study
Critical Care volume 21, Article number: 134 (2017)
- The Letter to this article has been published in Critical Care 2018 22:205
The purpose of this study was to investigate whether polymyxin B hemoperfusion (PMX-HP) improves the survival of patients with septic shock.
This was a retrospective, multicenter study conducted on patients treated during a 3-year period. We performed propensity-score analyses of the Japan Septic Disseminated Intravascular Coagulation (JSEPTIC DIC) study database. The study included data on 1723 patients with septic shock aged 16 years or older. Furthermore, we divided patients into to PMX-HP- and non-PMX-HP-treated groups. The primary endpoint was all-cause hospital mortality; secondary endpoints included intensive care unit (ICU) mortality and number of ICU-free days (ICUFDs) in the first 28 days.
Of 1,723 eligible patients, 522 had received PMX-HP. Propensity score matching created 262 matched pairs (i.e., 262 patients in each of the non-PMX-HP and PMX-HP groups). The proportion of all-cause hospital mortality was significantly lower in the PMX-HP group than in the non-PMX-HP group (32.8% vs. 41.2%; odds ratio (OR): 0.681; 95% confidence interval (CI): 0.470–0.987; P = 0.042). The number of ICUFD in the first 28 days was significantly higher in the PMX-HP group than in the non-PMX-HP group (18 (0-22) vs. 14 (0-22) days, respectively; P = 0.045). On the other hand, there was no significant difference in ICU mortality between the two groups (21.8% vs. 24.4%; OR: 0.844; CI: 0.548–1.300; P = 0.443).
Our results strongly suggest that PMX-HP reduces all-cause hospital mortality and length of ICU stay in patients with septic shock.
Despite the availability of modern antibiotics and resuscitation therapies, sepsis is a leading cause of death in critically ill patients . Treatment of patients with septic shock is a major challenge for physicians. To improve clinical management and outcome of critically ill patients, the Surviving Sepsis Campaign guidelines were published approximately a decade ago and were most recently revised in 2012 .
Endotoxin, a lipopolysaccharide derived from the outer membranes of gram-negative rods (GNRs), is a key factor in the sepsis cascade because it triggers a series of inflammatory reactions that lead to organ dysfunction [3, 4]. Because high serum concentrations of endotoxin are closely linked to increased risk of multiple organ failure and death [5, 6], endotoxin is considered a therapeutic target in treating sepsis . Polymyxin B direct hemoperfusion (PMX-HP) removes plasma endotoxins and is considered an effective treatment for sepsis . Moreover, Totsugawa et al.  reported that PMX-HP not only removes plasma endotoxins, but also causes a drastic decrease in the doses of inotropic agents and a shortening of the duration of mechanical ventilation in patients with severe sepsis and/or septic shock from gram-positive cocci (GPC). Moreover, Yamato et al.  reported that treatment with a combination of PMX-HP and recombinant human soluble thrombomodulin (rhsTM) significantly improves survival rates after septic shock with disseminated intravascular coagulation (DIC) due to GPC or GNR infections. These results suggest that PMX-HP has a survival benefit not only in patients with GNR infections, but also in those with GPC-induced events. Two randomized controlled trials (RCTs) of abdominal septic shock have been reported to date. One is the EUPHAS trial , which reported a significant reduction in the 28-day mortality rate with PMX-HP in comparison with conventional treatment (32% vs. 53%; hazard ratio (HR): 0.36; 95% confidence interval (CI): 0.16–0.80; P = 0.01). In contrast, in the ABDOMIX RCT  there was no significant difference in the 28-day mortality rate between PMX-HP and conventional treatment (27.7% vs. 19.5%, respectively; P = 0.14). Therefore, it remains unclear whether PMX-HP produces a survival benefit in patients with abdominal septic shock. Furthermore, no studies have compared the usefulness of PMX-HP for various infection sites and different types of septic shock-causing pathogens as well as GNRs.
Therefore, we conducted this retrospective study in a large number of Japanese multi-intensive care unit (ICU) patients with septic shock arising from various sites of infection and types of pathogens to determine the efficacy of PMX-HP in reducing mortality using propensity score analysis.
Study design, setting, and selection of participants
This retrospective, observational study used the dataset of the Japan Septic Disseminated Intravascular Coagulation (JSEPTIC DIC) study, which was conducted in 42 ICUs in 40 institutions in Japan (Additional files 1 and 2) and was approved by the Institutional Review Boards of all participating hospitals. The JSEPTIC DIC study aimed to evaluate anti-DIC drugs in patients with severe sepsis or septic shock who were admitted to ICUs between January 2011 and December 2013 [13, 14]. Because this database had already been anonymized for individual patient data and institutions, the Institutional Review Board waived the need for review of this post-hoc study. However, we did not input patient personal data such as name or medical ID number at each facility in order to adhere strictly to the anonymity of patients. Included patients were those aged ≥16 years who had been admitted to the study ICUs between January 2011 and December 2013 for treatment of severe sepsis or septic shock, as defined by the International Sepsis Definitions Conference .
In this study, the following information was collected from the JSEPTIC DIC study dataset: age, sex, body weight (BW), type of ICU, route of admission to the ICU, ICU policy, number of ICU beds, pre-existing organ dysfunction, Acute Physiology and Chronic Health Evaluation (APACHE) II score , total Sequential Organ Failure Assessment (SOFA) score , systemic inflammatory response syndrome (SIRS) score , Japanese Association for Acute Medicine (JAAM) DIC score , primary infection site, microorganisms responsible for sepsis, laboratory tests (white blood cell count (WBC), platelet count, hemoglobin (Hb) and prothrombin time-international normalized ratio (PT-INR)) at the time of admission, packed red blood cells (PRBC) administered, surgical interventions at the infection site, anti-DIC drugs (rhsTM, antithrombin (AT) III products, protease inhibitors, or heparinoids), intravenous immunoglobulin (IVIG), low-dose steroids, and renal replacement therapy (RRT) for renal or non-renal indications, and PMX-HP during the first week after ICU admission. Furthermore, all-cause hospital mortality, ICU mortality, and length of ICU stay were collected for evaluation of the endpoints. We defined the ICU policy as follows: open ICU was defined as all patients admitted to the ICU were managed by each department of doctors; closed ICU was defined as all patients admitted to the ICU were managed by intensivists or anesthesiologists or emergency doctors.
Patients with SOFA cardiovascular scores <3 and those who did not receive catecholamines upon ICU admission were excluded because they did not fit the criteria for septic shock. Furthermore, patients for whom the following data were missing were excluded: BW, SOFA score, WBC, Hb, platelet count, and PT-INR. Eligible patients were then allocated to PMX-HP and non-PMX-HP groups.
PMX-HP was performed with an adsorbent column designed for clinical use that contained 5 mg of PMX per gram of polystyrene fiber (Toray Industries, Tokyo, Japan) [20, 21]. This device was approved in 1994 and is widely used for treating severe sepsis in clinical settings in Japan .
The primary endpoint of this study was all-cause hospital mortality, and the secondary endpoints ICU mortality and ICU-free days (ICUFDs). ICUFDs were calculated as follows: ICUFDs = 0 if the patient died during the first 28 days; ICUFDs = (28 − x) if the patient survived more than 28 days, where x is the number of days spent in the ICU; and ICUFDs = (28 − y) if the patient had been transferred to another hospital before 28 days had elapsed, where y is the number of days spent in the ICU.
Data are expressed as number (%) for categorical variables, mean ± standard deviation (SD) for normally distributed variables, and median (first quartile to third quartile) for non-normally distributed variables. One-to-one nearest neighbor matching without replacement was performed between the PMX-HP and non-PMX-HP groups based on the estimated propensity scores for each patient. To estimate the propensity score, a logistic regression model was fitted for patients who had undergone PMX-HP treatment as a function of patient and ICU characteristics, including age, sex, BW, type of ICU, route of admission to the ICU, ICU policy, number of ICU beds, pre-existing organ dysfunction, APACHE II score, total SOFA, a SIRS score <2 vs. ≥2 , JAAM DIC score ≥4 vs. <4 , primary infection site, microorganisms responsible for sepsis, laboratory tests (WBC, platelet count, Hb concentration, and PT-INR), PRBC administration, surgical interventions at the infection site, anti-DIC drugs (rhsTM, AT III products, protease inhibitors, or heparinoids), IVIG, low-dose steroids, and RRT for renal or non-renal indications. A caliper width equal to 0.01 of the standard deviation of the logit of the propensity score was used. The standardized difference was used to evaluate covariate balance. An absolute standardized difference of >10% signifies a meaningful imbalance .
To evaluate differences between the PMX-HP and non-PMX-HP groups, categorical variables were compared by logistic regression, whereas continuous variables were compared by Student’s t tests or Wilcoxon test. ICU and hospital mortality rates were analyzed using conditional logistic regression, including the group (PMX-HP vs. non-PMX-HP) as a covariate and the matched set as a stratum. A signed rank test was used to compare the ICUFDs between groups. SAS version 9.4 (SAS Institute, Cary, NC, USA) was used for all analyses.
This study enrolled 3,195 patients over the observational period, 1,363 of whom did not have septic shock and were excluded, as were 109 patients for whom the required data were unavailable. Finally, the 1,723 eligible patients were categorized into the PMX-HP (n = 522) or non-PMX-HP (control group; n = 1,201) groups, from which 262 propensity score-matched pairs were generated (Fig. 1). The C statistic indicated that the goodness of fit was 0.849 in the propensity score model.
The baseline characteristics of the unmatched PMX-HP and non-PMX-HP groups and those of the propensity score-matched groups are shown in Tables 1 and 2. When the unmatched groups were compared, ICU type (emergency center or surgical ICU), route of admission to the ICU, ICU policy, number of ICU beds, pre-existing organ dysfunction, SOFA score, JAAM DIC, primary infection site, microorganism, WBC, platelet counts, Hb, PT-INR, PRBC, surgical intervention, and other therapeutic interventions (rhsTM, AT III concentrate, protease inhibitors, IVIG, low-dose steroids, RRT, and non-renal RRT) differed significantly between the two groups. After propensity score matching, the baseline patient characteristics were well balanced between the groups, the standardized differences being ≤0.1.
The overall all-cause hospital mortality was 37.0% (637/1,723). There was no significant difference in all-cause hospital mortality between the two unmatched groups (PMX-HP vs. non-PMX-HP: 37.9% vs. 36.6%, respectively; odds ratio (OR): 1.061; 95% CI: 0.858–1.312; P = 0.585). However, a significant difference was observed between the two groups after propensity-score matching (PMX-HP vs. non-PMX-HP: 32.8% vs. 41.2%, respectively; OR: 0.681; 95% CI: 0.470–0.987; P = 0.042). Additionally, in the propensity-score matched groups, number of ICUFDs in the first 28 days was significantly greater in the PMX-HP group than in the non-PMX-HP group (18 (0–22) vs. 14 (0–22) days, respectively; P = 0.045). On the other hand, there was no significant difference in ICU mortality between the two groups (21.8% vs. 24.4%, respectively; OR: 0.844; 95% CI: 0.548–1.300; P = 0.443) (Table 3).
Our study included the largest number of patients with septic shock until now across 42 Japanese ICUs. PMX-HP has been accepted by the Japanese national health insurance program since 1994 ; more than 100,000 patients have received this treatment since then . In Japan, PMX-HP is generally administered for severe sepsis or septic shock due to GNR infection (or suspected infection). In this study, we enrolled patients with septic shock associated with various sites of infection and pathogens; our data revealed that all-cause hospital mortality was significantly lower and there were significantly more ICUFDs in the PMX-HP group than in the non-PMX-HP group. Additionally, this is the first study to show a survival benefit of PMX-HP in patients with septic shock at various sites of infection and pathogens; these data are thus very noteworthy. Because various baseline characteristics differed between the PMX-HP (n = 522) and non-PMX-HP (n = 1201) groups, comparing all data for these two regimens would not be valid. Therefore, to adjust for differing baseline characteristics, we extracted 262 comparable subjects from each group by propensity score matching. Almost all baseline characteristics were homogenous between the resultant groups, making a comparison between them valid. Thus, the most valid conclusions can be derived from comparing the PMX-HP (n = 262) and non-PMX-HP (n = 262) groups.
Cruz et al.  have reported that PMX-HP produces improvements in mortality, as well as in cardiac index, mean arterial pressure, inotropic score, vasopressor dependency index, and mean PaO2/FiO2 ratio. Moreover, a recent large retrospective study  showed that PMX-HP treatment reduces 28-day mortality in high-risk patients with septic shock complicated by continuous RRT-requiring acute kidney injury (the 28-day mortality was 40.2% (393/978) in the PMX-HP group and 46.8% (458/978) in the non-PMX-HP group; P = 0.003). In contrast, using propensity-matched analysis of data from Japanese Diagnosis Procedure Combination (DPC) databases, Iwagami et al.  reported no significant survival benefit in patients with postoperative abdominal septic shock (the 28-day mortality was 17.1% (101/590) in the PMX-HP group and 16.3% (96/590) in the non-PMX-HP group; P = 0.696). However, their DPC database  did not incorporate the scoring systems generally used in critically ill patients (such as the APACHE II, SOFA, JAAM DIC, and SIRS scores). Therefore, we could not determine the severity of the patients’ conditions in their study. Additionally, they accepted patients who had received noradrenaline and/or dopamine on day 0 as possibly having septic shock. However, Hashiguchi and Iba  highlighted a lower 28-day mortality rate in their study than in previous studies [11, 27]. Because the JSEPTIC DIC study database does not supply 28-day mortality, we were unable to evaluate this variable. However, in our study, the mean APACHE II score was over 25 on entry and the overall all-cause hospital mortality rate was approximately 37% (194/524) in the matched group. Therefore, we strongly suspect that this discrepancy in mortality rates is attributable to differences in severity of illness between our study subjects and previous studies; that is, patients enrolled in the Iwagami et al.  study were possibly less severely ill than our patients. Furthermore, the hospital mortality rate was very high in both groups in this study. However, a previous Japanese cohort study reported a similar hospital mortality from septic shock (41.5%, 117/282) .
Regarding the curative effects of PMX-HP, a meta-analysis by Cruz et al.  reported that PMX-HP treatment is associated with an increase in mean arterial pressure of 19 mm Hg (95% CI: 15–22 mmHg; P < 0.001) and a decrease in dopamine/dobutamine dose of 1.8 μg/kg per minute (95% CI: 0.4–3.3 μg/kg per minute; P = 0.01). Furthermore, the mean PaO2/FiO2 ratio reportedly increases by 32 units (95% CI: 23–41 units; P < 0.001). These data suggest that PMX-HP improves patient hemodynamics and oxygenation. In our study, the PMX-HP group had significantly more ICUFDs in the first 28 days than the non-PMX-HP group; this result may be attributable to clinical effects similar to those reported by Cruz et al. .
In this study, organisms were isolated from a relatively high proportion of patients and subjected to microbiologic testing. In the previous Japanese Sepsis Registry database  a high percentage of patients had blood cultures (81.4%). Additionally, in the JSEPTIC DIC study, blood cultures were performed in 94% of patients . Thus, microbiological tests can usually be performed in patients with sepsis in Japanese ICUs in accordance with the Japanese guidelines for the management of sepsis . Moreover, we enrolled patients with various sites of infection and types of pathogen. Patients with GPC infection comprised 20.0% (205/524) of the matched group. Nevertheless, all-cause hospital mortality was significantly better in the PMX-HP group than in the non-PMX-HP group. PMX-HP was originally developed for removal of endotoxin and used to treat GNR-induced septic shock. However, our results suggest that PMX-HP also has a beneficial effect on GPC-induced septic shock. PMX-HP is reportedly able to adsorb endogenous cannabinoids such as anandamide and 2-arachidonoylglycerol , as well as activated monocytes . The interaction of cannabinoids with vascular cannabinoid receptors leads to the hypotension that occurs in hemorrhagic or endotoxic shock [34,35,36]. Moreover, sepsis-induced immunoparalysis appears to play a key role in sepsis-induced morbidity and mortality . One of the most important biomarkers of immunoparalysis is the human leukocyte antigen (HLA)-DR on the cell surface of monocytes (mHLA-DR), which is correlated with mortality [38, 39]. Ono et al.  reported that mHLA-DR was markedly decreased in patients with septic shock, and that this decrease was significantly reversed after PMX-HP treatment (P < 0.01). They thus concluded that PMX-HP may be a new strategy for helping patients to recover from immunoparalysis in septic conditions. In addition to endotoxin adsorption, adsorption of mediators such as endogenous cannabinoids or recovery from immunoparalysis may have contributed to the improvement in hospital mortality identified in this present study. In contrast, the JSEPTIC DIC study database does not contain information on cause of death and there is no clear explanation for the reported discrepancy between ICU mortality and all-cause hospital mortality. Hotchkiss et al.  reported development of immunoparalysis in later phases of sepsis. Hence, even though PMX-HP is an acute intervention, the hospital mortality (longer term mortality) observed in the present study may represent a significant improvement.
Some limitations of our study deserve consideration. First, this study was retrospective. Second, we did not consider the number of times (once or twice), the duration, or the initiation time of PMX-HP administration after ICU admission. Third, we did not examine long-term prognosis (such as 60-day or 90-day mortality). Fourth, a new definition of sepsis was published in 2016 . Because the JSEPTIC DIC study was planned in November 2015, we used the 2001 consensus sepsis definition  in this study. Finally, we were unable to determine the exact timing of the various therapeutic interventions. However, because other therapeutic interventions and PMX-HP are usually performed simultaneously upon admission to the ICU, we considered it acceptable to use therapeutic interventions when estimating propensity scores. Because of these limitations, further studies (particularly RCTs) are required to more reliably ascertain the survival benefit of PMX-HP. In fact, the efficacy of PMX-HP treatment for septic shock is currently being investigated in the USA and Canada ; the results of these trials are eagerly anticipated.
This study demonstrated that PMX-HP is associated with reduced all-cause hospital mortality and number of ICUFDs in patients with septic shock caused by various pathogens and with various sites of infection.
Despite the availability of modern antibiotics and resuscitation therapies, sepsis is a leading cause of death in critically ill patients.
Endotoxin, a lipopolysaccharide derived from the outer membranes of gram-negative rods, is a key factor in the sepsis cascade and high serum concentrations of endotoxin are closely linked to increased risk of multiple organ failure and death.
Polymyxin B direct hemoperfusion (PMX-HP) removes plasma endotoxins and is considered an effective treatment for sepsis.
The aim of this study was to investigate the usefulness of PMX-HP for various infection sites and different types of septic shock caused by not only gram-negative rods but other pathogens.
This study included the largest number of patients with septic shock until now across 42 Japanese ICUs.
PMX-HP is associated with reduced all-cause hospital mortality and number of ICU free days in patients with septic shock caused by various pathogens and with various sites of infection.
Acute Physiology and Chronic Health Evaluation
Disseminated intravascular coagulation
Diagnosis procedure combination
Human leukocyte antigen
Intensive care unit
Japanese Association for Acute Medicine
- JSEPTIC DIC:
The Japan Septic Disseminated Intravascular Coagulation
Polymyxin B hemoperfusion
Packed red blood cells
Prothrombin time-international normalized ratio
Randomized controlled trial
Recombinant human soluble thrombomodulin
Renal replacement therapy
Systemic inflammatory response syndrome
Sequential Organ Failure Assessment
White blood cell count
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We thank all collaborators of the JSEPTIC DIC study for collecting the data: Shinjiro Saito and Shigehiko Uchino (Intensive Care Unit, Department of Anesthesiology, Jikei University School of Medicine); Daisuke Kudo (Division of Emergency and Critical Care Medicine, Tohoku University Graduate School of Medicine); Toshihiko Mayumi (Department of Emergency Medicine, University of Occupational and Environmental Health); Takeo Azuhata (Division of Emergency and Critical Care Medicine, Department of Acute Medicine, Nihon University School of Medicine); Fumihito Ito (Department of Emergency & Critical Care Medicine, Ohta General Hospital Foundation Ohta Nishinouchi Hospital); Shodai Yoshihiro (Pharmaceutical Department, JA Hiroshima General Hospital); Hayakawa Katsura (Department of Emergency and Critical Care Medicine, Saitama Red Cross Hospital); Tsuyoshi Nakashima (Department of Emergency and Critical Care Medicine, Wakayama Medical University); Takayuki Ogura (Department of Emergency Medicine and Critical Care Medicine, Advanced Medical Emergency Department and Critical Care Center, Japan Red Cross Maebashi Hospital); Eiichiro Noda (Emergency and Critical Care Center, Kyushu University Hospital); Yoshihiko Nakamura (Department of Emergency and Critical Care Medicine, Fukuoka University Hospital); Ryosuke Sekine (Emergency Department, Ibaraki Prefectural Central Hospital); Kazuma Yamakawa and Yoshiaki Yoshikawa (Department of Emergency and Critical Care, Osaka General Medical Center); Motohiro Sekino (Division of Intensive Care, Nagasaki University Hospital); Keiko Ueno (Department of Emergency and Critical Care Medicine, Tokyo Medical University, Hachioji Medical Center); Yuko Okuda (Anesthesiology, Kyoto First Red-cross hospital); Masayuki Watanabe (Intensive Care Unit, Saiseikai Yokohamasi Tobu Hospital); Akihito Tampo (Department of Emergency Medicine, Asahikawa Medical University); Nobuyuki Saito (Shock and Trauma Center, Nippon Medical School Chiba Hokusoh Hospital); Yuya Kitai (Emergency Medicine, Kameda Medical Center); Kohei Takimoto and Hiroki Takahashi (Department of Traumatology and Acute Critical Medicine, Osaka University Graduate School of Medicine); Iwao Kobayashi (Emergency and Critical Care Medicine, Asahikawa Red Cross Hospital); Yutaka Kondo (Department of Emergency and Critical Care Medicine, Graduate School of Medicine, University of the Ryukyus); Masamitsu Sanui, Yusuke Iizuka, and Wataru Matsunaga (Department of Anesthesia and Critical Care Medicine, Saitama Medical Center Jichi Medical University); Sho Nachi (Advanced Critical Care Center, Gifu University Hospital); Toru Miike (Emergency and Critical Care Center, Saga University Hospital); Hiroshi Takahashi (Division of Cardiovascular Disease, Steel Memorial Muroran Hospital); Shuhei Takauji (Department of Emergency Medicine and Critical Care, Sapporo City General Hospital); Kensuke Umakoshi (Division of Emergency Medicine, Ehime University Hospital); Takafumi Todaka (Intensive Care Unit, Tomishiro Central Hospital); Hiroshi Kodaira (Department of Emergency Medicine, Akashi City Hospital); Kohkichi Andoh (Critical Care Department, Sendai City Hospital); Takehiko Kasai (Emergency Department, Hakodate Municipal Hospital); Yoshiaki Iwashita (Emergency and Critical Care Center, Mie University Hospital); Hideaki Arai (Department of Emergency Medicine, University of Occupational and Environmental Health Hospital); Masato Murata (Department of Emergency Medicine, Gunma University); Masahiro Yamane (Department of Anesthesia and Intensive Care, KKR Sapporo Medical Center); Kazuhiro Shiga (Emergency and Critical Care Center, Seirei Mikatahara General Hospital); and Naoto Hori (Intensive Care Unit, Hyogo College of Medicine).
There were no external sources of funding for this retrospective study.
Availability of data and materials
The data that support the findings of this study are available from the JSEPTIC DIC group but restrictions apply to the availability of these data, and so are not publicly available. Data are, however, available from the authors upon reasonable request and with permission of the JSEPTIC DIC group.
YN, TK, MH, and HI had full access to all the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. YN, TK, FK, MH, KH, YK, RY, TN, and MM contributed to the conception and design of the study and take responsibility for the accuracy of the data analysis. YN, FK, TK, and HI contributed to data acquisition, analysis and interpretation of data. YN and HI contributed to drafting the manuscript. YN, FK, and HI contributed to the statistical analysis. All authors read and approved the final manuscript.
The authors declare that they have no competing interests.
Consent for publication
Ethics approval and consent to participate
The JSEPTIC DIC study was conducted in 42 ICUs of 40 institutions in Japan (Additional file 1), and was approved by the Institutional Review Boards of each hospital. The boards waived the requirement for informed consent because of the retrospective nature of the JSEPTIC DIC study. Since this database was already anonymized for individual patient data and institutions, the Institutional Review Board waived the need for review of this post-hoc study. However, we did not input patient personal data such as name or medical ID number at each facility in order to adhere strictly to the anonymity of patients.
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Nakamura, Y., Kitamura, T., Kiyomi, F. et al. Potential survival benefit of polymyxin B hemoperfusion in patients with septic shock: a propensity-matched cohort study. Crit Care 21, 134 (2017). https://doi.org/10.1186/s13054-017-1712-3
- Polymyxin B hemoperfusion
- Septic shock
- Propensity score matching
- Intensive care unit-free days