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      Improved understanding of the pathophysiology of sepsis: Setting the scene for potential novel adjunctive therapies

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      Southern African Journal of Critical Care (Online)
      Health & Medical Publishing Group

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          Abstract

          The occurrence of sepsis in the critically ill population is a dreaded phenomenon when taking into consideration the devastating complications associated with the disease. Despite its high incidence and unacceptably high mortality, this complex syndrome remains poorly understood in terms of defining the disease, detecting the presence or absence of an infection, and therapeutic strategies to optimise immediate and long-term outcomes. Global efforts to address these issues coupled with significant advances in medical technologies and our improved understanding of the pathophysiology of the disease have led to some exciting developments in the domain of adjunctive therapies for sepsis. In particular, interest has focused around immunomodulation strategies and metabolic resuscitation. Some of these therapies sound particularly promising in terms of the early available evidence. The concept of personalised or individualised medicine takes centre stage when considering such therapies, as it is becoming increasingly evident that in order to achieve benefits, we need to introduce appropriate therapies at the right time, the right dose and for an appropriate duration. This review encapsulates a selection of these new adjunctive therapies.

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          High-volume versus standard-volume haemofiltration for septic shock patients with acute kidney injury (IVOIRE study): a multicentre randomized controlled trial.

          Septic shock is a leading cause of death among critically ill patients, in particular when complicated by acute kidney injury (AKI). Small experimental and human clinical studies have suggested that high-volume haemofiltration (HVHF) may improve haemodynamic profile and mortality. We sought to determine the impact of HVHF on 28-day mortality in critically ill patients with septic shock and AKI. This was a prospective, randomized, open, multicentre clinical trial conducted at 18 intensive care units in France, Belgium and the Netherlands. A total of 140 critically ill patients with septic shock and AKI for less than 24 h were enrolled from October 2005 through March 2010. Patients were randomized to either HVHF at 70 mL/kg/h or standard-volume haemofiltration (SVHF) at 35 mL/kg/h, for a 96-h period. Primary endpoint was 28-day mortality. The trial was stopped prematurely after enrolment of 140 patients because of slow patient accrual and resources no longer being available. A total of 137 patients were analysed (two withdrew consent, one was excluded); 66 patients in the HVHF group and 71 in the SVHF group. Mortality at 28 days was lower than expected but not different between groups (HVHF 37.9 % vs. SVHF 40.8 %, log-rank test p = 0.94). There were no statistically significant differences in any of the secondary endpoints between treatment groups. In the IVOIRE trial, there was no evidence that HVHF at 70 mL/kg/h, when compared with contemporary SVHF at 35 mL/kg/h, leads to a reduction of 28-day mortality or contributes to early improvements in haemodynamic profile or organ function. HVHF, as applied in this trial, cannot be recommended for treatment of septic shock complicated by AKI.
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            Adrenergic regulation of innate immunity: a review

            The sympathetic nervous system has a major role in the brain-immune cross-talk, but few information exist on the sympathoadrenergic regulation of innate immune system. The aim of this review is to summarize available knowledge regarding the sympathetic modulation of the innate immune response, providing a rational background for the possible repurposing of adrenergic drugs as immunomodulating agents. The cells of immune system express adrenoceptors (AR), which represent the target for noradrenaline and adrenaline. In human neutrophils, adrenaline and noradrenaline inhibit migration, CD11b/CD18 expression, and oxidative metabolism, possibly through β-AR, although the role of α1- and α2-AR requires further investigation. Natural Killer express β-AR, which are usually inhibitory. Monocytes express β-AR and their activation is usually antiinflammatory. On murine Dentritic cells (DC), β-AR mediate sympathetic influence on DC-T cells interactions. In human DC β2-AR may affect Th1/2 differentiation of CD4+ T cells. In microglia and in astrocytes, β2-AR dysregulation may contribute to neuroinflammation in autoimmune and neurodegenerative disease. In conclusion, extensive evidence supports a critical role for adrenergic mechanisms in the regulation of innate immunity, in peripheral tissues as well as in the CNS. Sympathoadrenergic pathways in the innate immune system may represent novel antiinflammatory and immunomodulating targets with significant therapeutic potential.
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              Severe sepsis and septic shock.

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                sajcc
                Southern African Journal of Critical Care (Online)
                South. Afr. j. crit. care (Online)
                Health & Medical Publishing Group (Cape Town, Western Cape Province, South Africa )
                1562-8264
                2078-676X
                July 2018
                : 34
                : 1
                : 4-8
                Affiliations
                [01] orgnameUniversity of Pretoria orgdiv1Faculty of Health Sciences orgdiv2Steve Biko Academic Hospital
                Article
                S1562-82642018000100002
                10.7196/sajcc.201.v34i1.361
                1779f7e6-5ec7-40db-aeea-43f97e8de863

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

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                Figures: 0, Tables: 0, Equations: 0, References: 79, Pages: 5
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                SciELO South Africa


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