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Cartridges for hemoadsorption containing styrene-divinylbenzene sorbent are used for multiple conditions, such as intoxication. The mass transfer zone comprises the extension along the longitudinal span of the cartridge where adsorption occurs. The aim of this experiment is to evaluate the mass transfer zone for vancomycin in the HA380 cartridge. The experiment was carried out twice. A saline solution with vancomycin passed through a HA380-modified cartridge at 100 ml/min in a single-pass fashion. The cartridge had four openings along its longitudinal dimension, at 3, 6, 9, and 12 cm. In both experiments, the collection of aliquots occurred at minute 4, in the four openings and pre- and post-cartridge, and an additional sample from the effluent bag at the end of each experiment. In the second experiment, an additional sampling of the same six sites occurred at minute 14. The sigmoidal shape of the curve for the mass transfer zone of vancomycin was similar to the theoretical one. In experiment one, at minute 4, vancomycin clearance was 98.75 ml/min. In experiment two, vancomycin clearance at minutes 4 and 14 was 93.76 and 93.20 ml/min, respectively. This implies an adequate and optimal design of the HA380 cartridge.

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ABSTRACT Membranes and sorbents play a crucial role in extracorporeal blood purification therapies, which aim to remove harmful molecules and toxins from the blood. Over the years, advancements in hemodialysis (HD) membranes and sorbents have significantly enhanced their safety and effectiveness. This review article will summarize the latest breakthroughs in the development and clinical application of HD membranes and sorbents. We will commence with a concise examination of the mechanisms involved in solute transport across membranes and sorbents. Subsequently, we will explore the evolutionary path of HD membranes, from early cellophane membranes to high-flux membranes, including the development of high-cut-off membranes and the emergence of medium- cut-off membranes. We will discuss each type of HD membrane's advantages and limitations, highlighting the most promising advancements in novel biomaterials and biocompatibility, technologies, research in membrane performance, and their clinical applications. Furthermore, we will delve into the evolution and progress of sorbent technology, tracing its historical development, outlining its key characteristics, examining the mechanism involved in the adsorption process, and exploring its clinical application. This review aims to underscore the growth and future landscape of HD membranes and sorbents in extracorporeal blood purification techniques.

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Membranes and sorbents play a crucial role in extracorporeal blood purification therapies, which aim to remove harmful molecules and toxins from the blood. Over the years, advancements in hemodialysis (HD) membranes and sorbents have significantly enhanced their safety and effectiveness. This review article will summarize the latest breakthroughs in the development and clinical application of HD membranes and sorbents. We will commence with a concise examination of the mechanisms involved in solute transport across membranes and sorbents. Subsequently, we will explore the evolutionary path of HD membranes, from early cellophane membranes to high-flux membranes, including the development of high-cutoff membranes and the emergence of medium- cutoff membranes. We will discuss each type of HD membrane's advantages and limitations, highlighting the most promising advancements in novel biomaterials and biocompatibility, technologies, research in membrane performance, and their clinical applications. Furthermore, we will delve into the evolution and progress of sorbent technology, tracing its historical development, outlining its key characteristics, examining the mechanism involved in the adsorption process, and exploring its clinical application. This review aims to underscore the growth and future landscape of HD membranes and sorbents in extracorporeal blood purification techniques.

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In order to develop a standardized nomenclature for the mechanisms and materials utilized during extracorporeal blood purification, a consensus expert conference was convened in November 2022. Standardized nomenclature serves as a common language for reporting research findings, new device development, and education. It is also critically important to support patient safety, allow comparisons between techniques, materials, and devices, and be essential for defining and naming innovative technologies and classifying devices for regulatory approval. The multidisciplinary conference developed detailed descriptions of the performance characteristics of devices (membranes, filters, and sorbents), solute and fluid transport mechanisms, flow parameters, and methods of treatment evaluation. In addition, nomenclature for adsorptive blood purification techniques was proposed. This report summarizes these activities and highlights the need for standardization of nomenclature in the future to harmonize research, education, and innovation in extracorporeal blood purification therapies.

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OBJECTIVES: To determine the feasibility, safety, and efficacy of a biomarker-guided implementation of a kidney-sparing sepsis bundle (KSSB) of care in comparison with standard of care (SOC) on clinical outcomes in patients with sepsis. DESIGN: Adaptive, multicenter, randomized clinical trial. SETTING: Five University Hospitals in Europe and North America. PATIENTS: Adult patients, admitted to the ICU with an indwelling urinary catheter and diagnosis of sepsis or septic shock, without acute kidney injury (acute kidney injury) stage 2 or 3 or chronic kidney disease. INTERVENTIONS: A three-level KSSB based on Kidney Disease: Improving Global Outcomes (KDIGOs) recommendations guided by serial measurements of urinary tissue inhibitor of metalloproteinases-2 and insulin-like growth factor-binding protein 7 used as a combined biomarker [TIMP2]•[IGFBP7]. MEASUREMENTS AND MAIN RESULTS: The trial was stopped for low enrollment related to the COVID-19 pandemic. Nineteen patients enrolled in five sites over 12 months were randomized to the SOC (n = 8, 42.0%) or intervention (n = 11, 58.0%). The primary outcome was feasibility, and key secondary outcomes were safety and efficacy. Adherence to protocol in patients assigned to the first two levels of KSSB was 15 of 19 (81.8%) and 19 of 19 (100%) but was 1 of 4 (25%) for level 3 KSSB. Serious adverse events were more frequent in the intervention arm (4/11, 36.4%) than in the control arm (1/8, 12.5%), but none were related to study interventions. The secondary efficacy outcome was a composite of death, dialysis, or progression of greater than or equal to 2 stages of acute kidney injury within 72 hours after enrollment and was reached by 3 of 8 (37.5%) patients in the control arm, and 0 of 11 (0%) patients in the intervention arm. In the control arm, two patients experienced progression of acute kidney injury, and one patient died. CONCLUSIONS: Although the COVID-19 pandemic impeded recruitment, the actual implementation of a therapeutic strategy that deploys a KDIGO-based KSSB of care guided by risk stratification using urinary [TIMP2]•[IGFBP7] seems feasible and appears to be safe in patients with sepsis.

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Acute kidney injury (AKI) is a heterogeneous syndrome with multiple etiologies. It occurs frequently in the neurocritical intensive care unit and is associated with greater morbidity and mortality. In this scenario, AKI alters the kidney-brain axis, exposing patients who receive habitual dialytic management to greater injury. Various therapies have been designed to mitigate this risk. Priority has been placed by KDIGO guidelines on the use of continuous over intermittent acute kidney replacement therapies (AKRT). On this background, continuous therapies have a pathophysiological rationale in patients with acute brain injury. A low-efficiency therapy such as PD and CRRT could achieve optimal clearance control and potentially reduce the risk of secondary brain injury. Therefore, this work will review the evidence on peritoneal dialysis as a continuous AKRT in neurocritical patients, describing its benefits and risks so it may be considered as an option when deciding among available therapeutic options.

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BACKGROUND /OBJECTIVE: Acute kidney injury (AKI) is a significant complication in critical care units (CCU). Non-neurological complications such as AKI are an independent predictor of poor clinical outcomes, with an increase in morbidity and mortality, financial costs, and worse functional recovery. This work aims to estimate the incidence of AKI and evaluate the risk factors and complications of AKI in neurocritical patients hospitalized in the CCU. METHODS: A retrospective cohort study was conducted. Patients admitted to the neurocritical care unit between 2016 and 2018 with a stay longer than 48 h were retrospectively analyzed in regard to the incidence, risk factors, and outcomes of AKI. RESULTS: The study population comprised 213 neurocritical patients. The incidence of AKI was 23.5%, with 58% KDIGO 1 and 2% requiring renal replacement therapy. AKI was an independent predictor of prolonged use of mechanical ventilation, cerebral edema, and mortality. Cerebral edema [OR 4.40 (95% CI 1.98-9.75) p < 0.001] and a change in chloride levels greater than 4 mmol/L at 48 h (OR 2.44 (95% CI 1.10-5.37) p = 0.027) were risk factors for developing AKI in the first 14 days of hospitalization. CONCLUSION: There is a high incidence of AKI in neurocritical patients; it is associated with worse clinical outcomes regardless of the CCU admission etiology or AKI severity.

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A hallmark of chronic kidney disease is the retention of solutes that normally are eliminated by the kidneys. The current classification defines uremic toxins based on molecular weight and protein affinity. The retention of solutes is already detected in the early stages of the disease when patients are pauci-symptomatic or asymptomatic but the role of therapies to retard the loss of kidney function in patients with chronic kidney disease (e.g., modulators of the renin-angiotensin-aldosterone system, sodium-glucose cotransporter inhibitors) in reducing uremic toxins is poorly understood. Most of the research evaluating the impact of therapies to lower serum concentrations of those toxic compounds is carried out in patients with kidney failure already undergoing kidney replacement therapy. The removal of those molecules relies in physicochemical mass transfer phenomena, i.e., adsorption, diffusion, and convection. In the past 2 decades, the rise and broad adoption of blood purification strategies with enhanced convective properties, such as high-volume online hemodiafiltration and expanded hemodialysis, considerably amplified the ability to mechanically extract middle molecules (molecular weight >0.5 kDa) from the blood compartment. Nonetheless, the classification of uremic toxins has not evolved in parallel with dialysis advancements. Mounting evidence demonstrates the link between middle molecules with uremic symptoms, cardiovascular and mortality risks. An urgent need for updating the classification exists. Defining the causative relationship between specific solutes and specific clinical outcomes will promote the development of targeted therapies. In parallel, the inclusion of new pertinent dimensions to the classification like the influence of new dialysis membranes, sorbents, and intestinal chelators in the concentration of uremic toxins would improve the understanding of the pathogenesis of chronic kidney disease, setting the pace for future research in nephrology.

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BACKGROUND: Acute kidney injury (AKI) in patients with COVID-19 can be caused by multiple mechanisms. Renal resistive index (RRI) is a noninvasive instrument to evaluate kidney hemodynamics, and it is obtained by analysis of intrarenal arterial waves using Doppler ultrasound. This study aimed to determine the role of RRI in predicting AKI and adverse outcomes in critically ill patients with COVID-19. METHODS: This cross-sectional study included 65 patients with confirmed SARS-CoV-2 pneumonia admitted to the critical care unit from April 1, 2020, to June 20, 2020. Informed consent was obtained from all individual participants included in the study. Cardiac, pulmonary, and kidney ultrasonographic evaluations were performed in a protocolized way. RESULTS: In this cohort, 65 patients were included, mean age was 53.4 years, 79% were male, and 35% were diabetic. Thirty-four percent of patients developed AKI, 12% required RRT, and 35% died. Of the patients who developed AKI, 68% had RRI ≥ 0.7. Also, 75% of the patients who required RRT had RRI ≥ 0.7. In the adjusted Cox model, the RRI ≥ 0.7 was associated with higher mortality (HR 2.86, 95% CI: 1.19-6.82, p = 0.01). CONCLUSIONS: Critical care ultrasonography is a noninvasive, reproducible, and accurate bedside method that has proven its usefulness. An elevated RRI may have a role in predicting AKI, RRT initiation, and mortality in patients with severe SARS-CoV-2 pneumonia.

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Neurocritical care has advanced substantially in recent decades, allowing doctors to treat patients with more complicated conditions who require a multidisciplinary approach to achieve better clinical outcomes. In neurocritical patients, nonneurological complications such as acute kidney injury (AKI) are independent predictors of worse clinical outcomes. Different research groups have reported an AKI incidence of 11.6% and an incidence of stage 3 AKI, according to the Kidney Disease: Improving Global Outcomes, that requires dialysis of 3% to 12% in neurocritical patients. These patients tend to be younger, have less comorbidity, and have a different risk profile, given the diagnostic and therapeutic procedures they undergo. Trauma-induced AKI, sepsis, sympathetic overstimulation, tubular epitheliopathy, hyperchloremia, use of nephrotoxic drugs, and renal hypoperfusion are some of the causes of AKI in neurocritical patients. AKI is the result of a sum of events, although the mechanisms underlying many of them remain uncertain; however, two important causes that merit mention are direct alteration of the physiological brain-kidney connection and exposure to injury as a result of the specific medical management and well-established therapies that neurocritical patients are subjected to. This review will focus on AKI in neurocritical care patients. Specifically, it will discuss its epidemiology, causes, associated mechanisms, and relationship to the brain-kidney axis. Additionally, the use and risks of extracorporeal therapies in this group of patients will be reviewed.

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RATIONALE: Protocols for regional citrate anticoagulation with the hypertonic 4% trisodium citrate solution have been recently described as an anticoagulation strategy during membrane therapeutic plasma exchange (mTPE). The effect of citrate in the patient's systemic hemostasis is negligible, thus regional citrate anticoagulation application is advantageous in circumstances in which heparin-based protocols are deemed unsafe for patients with a high risk of bleeding. The downsides of using hypertonic citrate solutions are mainly hypocalcemia and hypernatremia that ultimately can cause adverse clinical events. PRESENTING CONCERNS OF THE PATIENT: (1) A 57-year-old Caucasian female with a history of active vaginal bleeding secondary to endometrial hyperplasia. She had a history of antiphospholipid syndrome, and systemic lupus erythematosus with marked refractory autoimmune thrombocytopenia. Her platelet count was persistently below 4,000/mm3 even after different immunosuppressive regimens and daily platelet transfusions. (1) A 70-year-old Caucasian female was hospitalized presenting acute kidney injury stage 3 due to rapidly progressive antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis, however without the need for renal replacement therapy. At admission, serum creatinine (sCr) was 3.56 mg/dL (normal range: 0.53-1.00 mg/dL). Her baseline sCr was 0.8 mg/dL obtained 6 months earlier. Chest tomography revealed bilateral masses compatible with granulomatous lesions and no signs of alveolar bleeding. Since severe cases of ANCA vasculitis involving the lungs may evolve with alveolar hemorrhage, heparin was avoided. DIAGNOSES: (1) Systemic lupus erythematosus-associated autoimmune thrombocytopenia and (2) ANCA-associated vasculitis with kidney and lung involvement. INTERVENTIONS: Herein, we describe a case series of 12 consecutive mTPE treatments in 2 different patients using regional 4% trisodium citrate anticoagulation. OUTCOMES: All the sessions were uneventful, presented only minor electrolyte imbalances, and were effectively completed without early interruptions due to clotting of the plasmafilter. TEACHING POINTS: In our 2 cases, extracorporeal regional citrate anticoagulation was successful in optimizing plasmafilter patency without bleeding events in 2 high-risk patients using established protocols for the citrate and calcium infusions.

FONDEMENT: Les protocoles d'anticoagulation régionale avec une solution hypertonique à 4 % de citrate trisodique ont récemment été décrits comme stratégie d'anticoagulation pendant les séances d'échange plasmatique par filtration (mTPE ­ membrane therapeutic plasma exchange). L'effet du citrate étant négligeable sur l'hémostase systémique du patient, l'anticoagulation régionale au citrate s'avère avantageuse dans les cas où les protocoles avec l'héparine sont jugés dangereux pour les patients dont le risque d'hémorragie est élevé. Les inconvénients liés aux solutions hypertoniques de citrate sont principalement l'hypocalcémie et l'hypernatrémie, lesquelles peuvent éventuellement entraîner des effets indésirables sur le plan clinique. PRÉSENTATION DES CAS: a) Une femme de race blanche âgée de 57 ans qui présentait des saignements vaginaux actifs en raison d'une hyperplasie de l'endomètre. La patiente avait des antécédents de syndrome antiphospholipide et de lupus érythémateux disséminé avec thrombopénie autoimmune réfractaire marquée. Sa numération plaquettaire demeurait invariablement inférieure à 4 000/mm3 malgré différents traitements immunosuppresseurs et la transfusion quotidienne de plaquettes. b) Une femme de race blanche âgée de 70 ans hospitalisée pour une insuffisance rénale aiguë de stade 3 due à une vascularite à évolution rapide associée aux anticorps cytoplasmiques antineutrophiles (ANCA). La patiente ne nécessitait aucun traitement de remplacement rénal. Son taux de créatinine sérique (SCr) à l'admission était de 3,56 mg/dL (plage normale : 0,53 à 1,00 mg/dL) alors que son taux initial, mesuré 6 mois plus tôt, était de 0,8 mg/dL. Une tomographie thoracique a révélé des masses bilatérales compatibles avec les lésions granulomateuses et l'absence de saignement alvéolaire. L'héparine a été écartée puisque les cas graves de vascularite associée aux ANCA avec atteinte des poumons peuvent évoluer vers une hémorragie alvéolaire. DIAGNOSTICS: a) Thrombocytopénie autoimmune associée à un lupus érythémateux disséminé; b) vascularite associée aux ANCA avec atteinte des reins et des poumons. INTERVENTIONS: Nous décrivons une série de cas impliquant deux patientes ayant subi 12 séances de mTPE consécutives avec un anticoagulant régional à 4 % de citrate trisodique. RÉSULTATS: Toutes les séances se sont déroulées sans incident, seuls des déséquilibres électrolytiques mineurs ont été observés. Toutes les séances ont été réalisées efficacement, sans interruption précoce due au blocage du filtre à plasma. ENSEIGNEMENTS TIRÉS: Dans deux cas qui présentaient un risque élevé d'hémorragie, l'anticoagulation régionale extracorporelle avec citrate, réalisée conformément aux protocoles établis pour les perfusions de citrate et de calcium, a permis d'optimiser la perméabilité du filtre à plasma sans causer d'événement hémorragique.

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Abstract In the past decade, a new class of hemodialysis (HD) membranes (high retention onset class) became available for clinical use. The high cutoff (HCO) and the medium cutoff (MCO) membranes have wider pores and more uniformity in pore size, allowing an increased clearance of uremic toxins. Owing to the mechanism of backfiltration/internal filtration, middle molecules are dragged by the convective forces, and no substitution solution is needed. The HCO dialyzer is applied in septic patients with acute kidney injury requiring continuous kidney replacement therapy. The immune response is modulated thanks to the removal of inflammatory mediators. Another current application for the HCO dialyzer is in hematology, for patients on HD secondary to myeloma-kidney, since free light chains are more efficiently removed with the HCO membrane, reducing their deleterious effect on the renal tubules. In its turn, the MCO dialyzer is used for maintenance HD patients. A myriad of clinical trials published in the last three years consistently demonstrates the ability of this membrane to remove uremic toxins more efficiently than the high-flux membrane, an evolutionary disruption in the HD standard of care. Safety concerns regarding albumin loss as well as blood contamination from pyrogens in the dialysate have been overcome. In this update article, we explore the rise of new dialysis membranes in the light of the scientific evidence that supports their use in clinical practice.

Resumo Na última década, uma nova classe de membranas de hemodiálise (HD) (classe de início de alta retenção) tornou-se disponível para uso clínico. As membranas de ponto de corte alto (HCO) e ponto de corte médio (MCO) têm poros mais largos e maior uniformidade no tamanho dos poros, permitindo uma maior depuração de toxinas urêmicas. Devido ao mecanismo de retrofiltração/filtração interna, as moléculas médias são arrastadas pelas forças convectivas, não sendo necessária uma solução de substituição. O dialisador de HCO é aplicado em pacientes sépticos com lesão renal aguda que requerem terapia renal substitutiva contínua. A resposta imunológica é modulada graças à remoção de mediadores inflamatórios. Outra aplicação atual para o dialisador de HCO é em hematologia, para pacientes em HD secundária ao rim do mieloma, uma vez que as cadeias leves livres são removidas mais eficientemente com a membrana de HCO, reduzindo seu efeito deletério sobre os túbulos renais. Por sua vez, o dialisador de MCO é utilizado para pacientes em HD de manutenção. Uma miríade de ensaios clínicos publicados nos últimos três anos demonstra consistentemente a capacidade desta membrana de remover toxinas urêmicas de forma mais eficiente do que a membrana de alto fluxo, uma ruptura evolutiva no padrão de cuidado em HD. As preocupações de segurança em relação à perda de albumina, bem como a contaminação do sangue por pirogênios no dialisato foram superadas. Neste artigo de atualização, exploramos o surgimento de novas membranas de diálise à luz das evidências científicas que apoiam seu uso na prática clínica.

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The study of kidney diseases has been described since the Hippocratic era, but nephrology as a medical specialty dates from the mid-20th century. Despite all interesting aspects of nephrology, there is a lack of interest by young physicians for the specialty worldwide. Great discoveries have been made throughout the years, leading to great achievements in diagnosis, classification, and treatment of kidney diseases. There is a current interest in the search for novel biomarkers for early detection of kidney dysfunction, and, in the future, there will be novel diagnostic tests for kidney diseases. There have been significant improvements in dialysis and transplant techniques, and novel modalities are being studied, including new renal replacement therapy modalities, such as the wearable artificial kidney. Another trend in the contemporary world, and one that should increase in the future, is the increasing patient connectivity, using novel technologies that will allow access to healthcare and improve outcomes.

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In the past decade, a new class of hemodialysis (HD) membranes (high retention onset class) became available for clinical use. The high cutoff (HCO) and the medium cutoff (MCO) membranes have wider pores and more uniformity in pore size, allowing an increased clearance of uremic toxins. Owing to the mechanism of backfiltration/internal filtration, middle molecules are dragged by the convective forces, and no substitution solution is needed. The HCO dialyzer is applied in septic patients with acute kidney injury requiring continuous kidney replacement therapy. The immune response is modulated thanks to the removal of inflammatory mediators. Another current application for the HCO dialyzer is in hematology, for patients on HD secondary to myeloma-kidney, since free light chains are more efficiently removed with the HCO membrane, reducing their deleterious effect on the renal tubules. In its turn, the MCO dialyzer is used for maintenance HD patients. A myriad of clinical trials published in the last three years consistently demonstrates the ability of this membrane to remove uremic toxins more efficiently than the high-flux membrane, an evolutionary disruption in the HD standard of care. Safety concerns regarding albumin loss as well as blood contamination from pyrogens in the dialysate have been overcome. In this update article, we explore the rise of new dialysis membranes in the light of the scientific evidence that supports their use in clinical practice.

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OBJECTIVES: To describe study design considerations and to simulate a trial of biomarker-guided sepsis management aimed to reduce acute kidney injury (acute kidney injury). Tissue inhibitor of metalloproteinases-2 and insulin-like growth factor-binding protein 7, urinary biomarkers of cell-cycle arrest, and indicators of kidney stress can detect acute kidney injury before clinical manifestations. We sought to determine the event rates for acute kidney injury as a function of serial measurements of urinary (tissue inhibitor of metalloproteinases-2)•(insulin-like growth factor-binding protein 7) in patients at risk of sepsis-associated acute kidney injury, so that an escalating series of kidney-sparing sepsis bundles based on international guidelines could be applied. DESIGN: We described the study protocol of "Limiting acute kidney injury Progression In Sepsis," a phase 4, multicenter, adaptive, randomized controlled trial. We performed simulations to estimate the rates for the trial's primary endpoint using patient-level data from two previous studies (Sapphire and Protocolized Care for Early Septic Shock). SETTING: Academic and community ICUs. PATIENTS: Critically ill patients with sepsis or septic shock, without evidence of stage 2/3 acute kidney injury at enrollment. INTERVENTIONS: None. MEASUREMENTS AND MAIN RESULTS: Our primary endpoint is progression of two or more stages of acute kidney injury, death, or dialysis within 72 hours after enrollment. In the Sapphire simulation, 45 of 203 patients (22%) with sepsis met the endpoint. In Protocolized Care for Early Septic Shock, 144 of 607 patients (24%) with septic shock met the endpoint. In both simulations, (tissue inhibitor of metalloproteinases-2)•(insulin-like growth factor-binding protein 7) patterns, suggested by Limiting acute kidney injury Progression In Sepsis protocol, stratified the risk for the endpoint from 6% (three negative tests) to 41% (for patients eligible for the highest level of kidney-sparing sepsis bundle) in Sapphire, and 14% (two negative tests) to 46% (for the highest level of kidney-sparing sepsis bundle) in Protocolized Care for Early Septic Shock. CONCLUSIONS: Findings of our Limiting acute kidney injury Progression In Sepsis trial simulation confirmed that (tissue inhibitor of metalloproteinases-2)•(insulin-like growth factor-binding protein 7) could identify patients with different rates of progression to moderate/severe acute kidney injury, death, or dialysis in 72 hours. The Limiting acute kidney injury Progression In Sepsis protocol algorithm is therefore feasible in terms of identifying suitably high-risk individuals for kidney-sparing sepsis bundle.

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