Acute kidney injury: a post-COVID-19 complication in children and adolescents / Lesão renal aguda: uma complicação pós-COVID-19 em crianças e adolescentes

ABSTRACT Objective: To describe cases of acute kidney injury (AKI) in children diagnosed with COVID-19, associated risk factors, clinical aspects and outcome of cases. Methods: Retrospective study, carried out in a pediatric hospital between March 2020 and September 2021, with patients with COVID-19 who were diagnosed with AKI, studying information present in medical records such as comorbidities, age, gender and use of nephrotoxic medications. Results: We studied 40 cases, and male individuals were significantly more affected (62.5%; p=0.025). AKI was a severe complication of COVID-19 infection, with 100% of the sample requiring admission to the Intensive Care Unit and 22.5% dying. The most prevalent comorbidities analyzed in this study were epilepsy, cerebral palsy and heart disease. Most patients were classified according to Kidney Disease: Improving Global Outcomes (KDIGO) criteria as KDIGO 1 (42.5%), and required orotracheal intubation (67.5%). The frequency of use of nephrotoxic medications and need for dialysis was low, with percentages of 35 and 17.5%, respectively. Among the children who died, 70.4% had some comorbidity and 88.8% received invasive ventilation. Conclusions: AKI in children with COVID-19 infection is associated with severe conditions. Despite the severity, most patients were discharged alive from the hospital.

RESUMO Objetivo: Descrever casos de lesão renal aguda (LRA) em crianças diagnosticadas com COVID-19, associando fatores de risco, aspectos clínicos e evolução dos casos. Métodos: Estudo retrospectivo, realizado em hospital pediátrico entre março de 2020 e setembro de 2021, com pacientes com COVID-19 diagnosticados com LRA, que examinou informações presentes em prontuários como comorbidades, idade, sexo e uso de medicações nefrotóxicas. Resultados: Foram estudados 40 casos, sendo o sexo masculino significativamente mais acometido (62,5%; p=0,025). A LRA foi uma complicação grave da infecção por COVID-19, com 100% da amostra necessitando de internação na Unidade de Terapia Intensiva e 22,5% indo a óbito. As comorbidades mais prevalentes analisadas neste estudo foram epilepsia, paralisia cerebral e cardiopatia. A maioria dos pacientes foi classificada pelos critérios Kidney Disease: Improving Global Outcomes (KDIGO) como KDIGO 1 (42,5%) e necessitou de intubação orotraqueal (67,5%). A frequência de uso de medicamentos nefrotóxicos e necessidade de diálise foi baixa, com percentuais de 35 e 17,5%, respectivamente. Entre as crianças que faleceram, 70,4% apresentavam alguma comorbidade e 88,8% receberam ventilação invasiva. Conclusões: A LRA em crianças com infecção por COVID-19 está associada a quadros graves, apesar de a maior parte dos pacientes ter recebido alta hospitalar.

Acute kidney injury: the experience of a tertiary center of Pediatric Nephrology / Insuficiência renal aguda: experiência de um centro terciário de Nefrologia Pediátrica

ABSTRACT Introduction: Acute kidney injury (AKI) is an abrupt deterioration of kidney function. The incidence of pediatric AKI is increasing worldwide, both in critically and non-critically ill settings. We aimed to characterize the presentation, etiology, evolution, and outcome of AKI in pediatric patients admitted to a tertiary care center. Methods: We performed a retrospective observational single-center study of patients aged 29 days to 17 years and 365 days admitted to our Pediatric Nephrology Unit from January 2012 to December 2021, with the diagnosis of AKI. AKI severity was categorized according to Kidney Disease Improving Global Outcomes (KDIGO) criteria. The outcomes considered were death or sequelae (proteinuria, hypertension, or changes in renal function at 3 to 6 months follow-up assessments). Results: Forty-six patients with a median age of 13.0 (3.5-15.5) years were included. About half of the patients (n = 24, 52.2%) had an identifiable risk factor for the development of AKI. Thirteen patients (28.3%) were anuric, and all of those were categorized as AKI KDIGO stage 3 (p < 0.001). Almost one quarter (n = 10, 21.7%) of patients required renal replacement therapy. Approximately 60% of patients (n = 26) had at least one sequelae, with proteinuria being the most common (n = 15, 38.5%; median (P25-75) urinary protein-to-creatinine ratio 0.30 (0.27-0.44) mg/mg), followed by reduced glomerular filtration rate (GFR) (n = 11, 27.5%; median (P25-75) GFR 75 (62-83) mL/min/1.73 m2). Conclusions: Pediatric AKI is associated with substantial morbidity, with potential for proteinuria development and renal function impairment and a relevant impact on long-term prognosis.

RESUMO Introdução: Insuficiência renal aguda (IRA) é uma deterioração abrupta da função renal. A incidência de IRA pediátrica está aumentando em todo o mundo, em ambientes críticos e não críticos. Nosso objetivo foi caracterizar apresentação, etiologia, evolução e desfechos da IRA em pacientes pediátricos internados em um centro de atendimento terciário. Métodos: Realizamos estudo retrospectivo observacional de centro único de pacientes com idade entre 29 dias a 17 anos e 365 dias internados em nossa Unidade de Nefrologia Pediátrica, de janeiro de 2012 a dezembro de 2021, com diagnóstico de IRA. A gravidade da IRA foi categorizada de acordo com os critérios do Kidney Disease Improving Global Outcomes (KDIGO). Os desfechos considerados foram óbito ou sequelas (proteinúria, hipertensão ou alterações na função renal em avaliações de acompanhamento de 3 a 6 meses). Resultados: Incluímos 46 pacientes com idade mediana de 13,0 (3,5-15,5) anos. Cerca de metade (n = 24; 52,2%) apresentou um fator de risco identificável para o desenvolvimento de IRA. Treze pacientes (28,3%) eram anúricos; todos foram classificados como IRA KDIGO 3 (p < 0,001). Quase um quarto (n = 10; 21,7%) dos pacientes necessitaram de terapia renal substitutiva. Aproximadamente 60% (n = 26) apresentou pelo menos uma sequela, sendo proteinúria a mais comum (n = 15; 38,5%; mediana (P25-75) da relação proteína/creatinina urinária 0,30 (0,27-0,44) mg/mg), seguida de taxa de filtração glomerular (TFG) reduzida (n = 11; 27,5%; mediana (P25-75) da TFG 75 (62-83) mL/min/1,73 m2). Conclusões: A IRA pediátrica está associada à morbidade substancial, com potencial para desenvolvimento de proteinúria e comprometimento da função renal e impacto relevante no prognóstico de longo prazo.

Acute kidney injury in nonagenarians: clinical characteristics and mortality / Injúria renal aguda em nonagenários: características clínicas e mortalidade

Abstract Introduction: Nonagenarians constitute a rising percentage of inpatients, with acute kidney injury (AKI) being frequent in this population. Thus, it is important to analyze the clinical characteristics of this demographic and their impact on mortality. Methods: Retrospective study of nonagenarian patients with AKI at a tertiary hospital between 2013 and 2022. Only the latest hospital admission was considered, and patients with incomplete data were excluded. A logistic regression analysis was conducted to define risk factors for mortality. A p-value < 0.05 was considered statistically significant. Results: A total of 150 patients were included, with a median age of 93.0 years (91.2-95.0), and males accounting for 42.7% of the sample. Sepsis was the most common cause of AKI (53.3%), followed by dehydration/hypovolemia (17.7%), and heart failure (17.7%). ICU admission occurred in 39.3% of patients, mechanical ventilation in 14.7%, vasopressors use in 22.7% and renal replacement therapy (RRT) in 6.7%. Death occurred in 56.7% of patients. Dehydration/hypovolemia as an etiology of AKI was associated with a lower risk of mortality (OR 0.18; 95% CI 0.04-0.77, p = 0.020). KDIGO stage 3 (OR 3.15; 95% CI 1.17-8.47, p = 0.023), ICU admission (OR 12.27; 95% CI 3.03-49.74, p < 0.001), and oliguria (OR 5.77; 95% CI 1.98-16.85, p = 0.001) were associated with mortality. Conclusion: AKI nonagenarians had a high mortality rate, with AKI KDIGO stage 3, oliguria, and ICU admission being associated with death.

Resumo Introdução: Nonagenários constituem um percentual de pacientes internados em ascensão, sendo a injúria renal aguda (IRA) frequente nesses pacientes. Sendo assim, é importante analisar as características clínicas dessa população e seu impacto na mortalidade. Métodos: Estudo retrospectivo de pacientes nonagenários com IRA entre 2013 e 2022 em um hospital terciário. Apenas o último internamento foi considerado e pacientes com dados incompletos foram excluídos. Uma análise por regressão logística foi realizada para definir fatores de risco para mortalidade. Um valor de p < 0,05 foi considerado significativo. Resultados: Foram incluídos 150 pacientes com mediana de idade 93,0 anos (91,2-95,0) e sexo masculino em 42,7%. Sepse foi a causa mais comum de IRA (53,3%), seguida de desidratação/hipovolemia (17,7%) e insuficiência cardíaca (17,7%). Admissão na UTI ocorreu em 39,3% dos pacientes, ventilação mecânica em 14,7%, uso de vasopressores em 22,7% e realização de terapia renal substitutiva (TRS) em 6,7%. Óbito ocorreu em 56,7% dos pacientes. Desidratação/hipovolemia como etiologia da IRA foi associado a menor risco de mortalidade (OR 0,18; IC 95% 0,04-0,77, p = 0,020). Estágio KDIGO 3 (OR 3,15; IC 95% 1,17-8,47, p = 0,023), admissão na UTI (OR 12,27; IC 95% 3,03-49,74, p < 0,001) e oligúria (OR 5,77; IC 95% 1,98-16,85, p = 0,001) foram associados à mortalidade. Conclusão: Nonagenários com IRA apresentaram alta mortalidade e IRA KDIGO 3, oligúria e admissão na UTI foram associadas ao óbito.

Systemic autoinflammatory disease, IgA glomerulonephritis and renal cortical necrosis: coincidence or causation? / Enfermedad autoinflamatoria sistémica, glomerulonefritis por IgA y necrosis cortical renal: ¿causalidad o casualidad?

Abstract We present a patient with a rare systemic autoinflam matory disease (mevalonate kinase deficiency -MKD-) with the identification of two heterozygous variants (c.1129G>A and c.32C>T) in the Mevalonate Kinase gene, detected by next generation sequencing and a highly prevalent glomerulonephritis (IgA nephropathy). The patient presents clinically with a monthly recurrent periodic fever from 12 days of age, accompanied by mucocutaneous lesions (maculopapular rash in ex tremities, aphthous stomatitis), joint (arthralgias in ankles, wrists and knees), lymphoid (cervical lymph adenopathy, splenomegaly), gastrointestinal (diarrhea, abdominal pain) and kidney (hematuria and protei-nuria) with repeated biopsies showing IgA nephropathy alternating activity with chronicity. During follow-up. The patients presented a poor therapeutic response to multiple immunosuppressive regimens used for 7 years (corticosteroids, azathioprine, mycophenolate, cyclo phosphamide, rituximab and tocilizumab), and finally a good response to canakinumab. Four years after starting canakinumab, during the course of an infection due to a muscle abscess, the clinical presentation is complicated by a severe renal microvascular event (renal cortical necrosis -RCN-) with acute kidney injury and dialysis requirement. Therecurrent episodes of inflammation due to MKD could act as triggers for the reactivation of glomerulonephritis (which would explain the poor response to immunosuppressants and the rapid pro gression to histological chronicity) and to generate a microenvironment that predisposes the development of RCN in the face of a non-serious infection. A defect in IgA molecules has been described in MKD, a phenom enon also observed in IgA nephropathy. This raises the challenging hypothesis of a common pathogenetic link between all the patient's clinical manifestations.

Resumen Presentamos un paciente con una rara enfermedad autoinflamatoria sistémica (deficiencia de mevalonato quinasa -DMQ-) con la identificación de dos variantes heterocigotas (c.1129G>A y c.32C>T) en el gen Meval onato Quinasa, detectadas por secuenciación masiva en paralelo y una glomerulonefritis de alta prevalencia (nefropatía por IgA). El paciente presentó un cuadro de fiebre periódica recurrente mensual desde los 12 días de vida, acompañada de lesiones mucocutáneas (rash maculopapular en extremidades, estomatitis aftosa), compromiso articular (artralgias en tobillos, muñecas y rodillas), linfoideo (linfoadenopatía cervical, esplenome galia), gastrointestinal (diarrea, dolor abdominal) y renal (hematuria y proteinuria) con repetidas biospias most rando nefropatía por IgA alternando actividad y cronic idad. Durante el seguimiento, tuvo una pobre respuesta terapéutica a múltiples esquemas inmunosupresores utilizados durante 7 años (corticoides, azatrioprina, micofenolato, ciclofosfamida, rituximab y tocilizumab), y buena respuesta finalmente a canakinumab. Cuatro años posteriores al inicio de canakinumab, durante el curso de una infección por un absceso muscular, el cuadro clínico se complica con un evento microvascular renal grave (necrosis cortical renal -NCR-) con fallo renal agudo y necesidad de diálisis. Los episodios recurrentes de inflamación por la DMQ podrían actuar como gatil los para la reactivación de su glomerulonefritis (lo que explicaría la escasa respuesta a inmunosupresores y la progresión rápida a cronicidad histológica) y para gen erar un microambiente que predisponga el desarrollo de una NCR ante una infección no grave. En la DMQ se ha descripto un defecto en las moléculas de IgA, fenómeno también observado en la nefropatía por IgA. Esto plantea la desafiante hipótesis de un vínculo patogénico común entre todas las manifestaciones clínicas del paciente.

Postoperative acute kidney injury in major noncardiac surgery. Narrative review / Lesión renal aguda posoperatoria en cirugía mayor no cardiaca. Revisión narrativa

Abstract Postoperative acute kidney injury is an underdiagnosed condition. Its incidence is variable and depends on demographic, clinical, and surgical stress-associated factors; hence the pathophysiology is multifactorial. It is extremely important to acknowledge those risk factors early and use tools to estimate the risk of developing the condition, in order to adopt perioperative measures to mitigate its occurrence and impact. Some of the complications resulting from this condition include prolonged ICU stay, higher susceptibility for infections, hospitalization-related complications, progression to acute and chronic kidney failure, and even the need for transient or permanent renal replacement therapies (RRT) in addition to diseases that increase the cardiovascular risk, such as systemic high blood pressure and/or coronary heart disease that result in increased comorbidities and mortality, with subsequent increases in healthcare costs, lower quality of life and increased burden of the disease in the short and long term. A systematic search of the literature was conducted in PubMed, Google Schoolar, and Lilacs, under the terms MeSh and DeCs using Boolean operators; a review was conducted of the summary of the articles identified and 57 of them were selected for their comprehensive reading. This narrative review summarizes the relevant information on this pathology for prevention and identification purposes, for the adequate management of patients undergoing major non-cardiac surgery.

Resumen La lesión renal aguda posoperatoria es una entidad subdiagnosticada. Su incidencia es variable y depende de factores demográficos, clínicos y los inherentes al estrés quirúrgico; por ende, la fisiopatología es multifactorial. Es de vital importancia reconocer precozmente dichos factores de riesgo durante la valoración preanestésica y hacer uso de herramientas para calcular el riesgo de desarrollarla para, de esta forma, adoptar medidas perioperatorias para mitigar su aparición e impacto. Entre las complicaciones derivadas de esta entidad se encuentran la estancia en unidades de cuidado intensivo prolongadas, mayor susceptibilidad de infecciones, complicaciones derivadas de la hospitalización, progresión a enfermedad renal aguda y crónica e incluso necesidad de terapias de reemplazo renal (TRR) transitorias o permanentes, además de enfermedades que aumentan el riesgo cardiovascular como hipertensión arterial sistémica y/o enfermedad coronaria, lo que genera aumento en morbimortalidad, con aumento en costos asociado a la atención en salud, menor calidad de vida y mayor carga de la enfermedad a corto y largo plazo. Se realizó una búsqueda sistemática de la literatura en bases de datos PubMed, Google Schoolar, Lilacs, bajo los términos MeSh y DeCs, usando los operadores booleanos, se revisó el resumen de los artículos encontrados y se seleccionaron 57 artículos para su lectura completa. Esta revisión narrativa sintetiza la información relevante sobre esta patología que permita prevenirla y reconocerla para el manejo adecuado de los pacientes que van a cirugía mayor no cardiaca.

Incidence of contrast-associated acute kidney injury: a prospective cohort / Incidência de lesão renal aguda associada ao contraste: uma coorte prospectiva

ABSTRACT Introduction: Contrast-associated acute kidney injury (CA-AKI) is a deterioration of kidney function that occurs after the administration of a iodinated contrast medium (ICM). Most studies that defined this phenomenon used older ICMs that were more prone of causing CA-AKI. In the past decade, several articles questioned the true incidence of CA-AKI. However, there is still a paucity of a data about the safety of newer ICM. Objective: To assess the incidence of CA-AKI in hospitalized patients that were exposed to computed tomography (CT) with and without ICM. Methods: Prospective cohort study with 1003 patients who underwent CT in a tertiary hospital from December 2020 through March 2021. All inpatients aged > 18 years who had a CT scan during this period were screened for the study. CA-AKI was defined as a relative increase of serum creatinine of ≥ 50% from baseline or an absolute increase of ≥ 0.3 mg/dL within 18 to 48 hours after the CT. Chi-squared test, Kruskal-Wallis test, and linear regression model with restricted cubic splines were used for statistical analyses. Results: The incidence of CA-AKI was 10.1% in the ICM-exposed group and 12.4% in the control group when using the absolute increase criterion. The creatinine variation from baseline was not significantly different between groups. After adjusting for baseline factors, contrast use did not correlate with worse renal function. Conclusion: The rate of CA-AKI is very low, if present at all, with newer ICMs, and excessive caution regarding contrast use is probably unwarranted.

RESUMO Introdução: Lesão renal aguda associada ao contraste (LRA-AC) é uma deterioração da função renal que ocorre após a administração de meio de contraste iodado (MCI). A maioria dos estudos que definiram esse fenômeno utilizaram MCI mais antigos, mais propensos a causar LRA-AC. Na última década, diversos artigos questionaram a verdadeira incidência de LRA-AC. Entretanto, ainda há escassez de dados sobre a segurança dos MCI mais novos. Objetivo: Avaliar a incidência de LRA-AC em pacientes hospitalizados expostos à tomografia computadorizada (TC) com e sem MCI. Métodos: Estudo de coorte prospectivo com 1.003 pacientes submetidos a TC em hospital terciário, de dezembro/2020 a março/2021. Todos os pacientes internados com idade ≥ 18 anos que realizaram TC nesse período foram selecionados. A LRA-AC foi definida como aumento relativo de creatinina sérica de ≥ 50% em relação ao valor basal ou aumento absoluto de ≥ 0,3 mg/dL dentro de 18 a 48 horas após a TC. Utilizamos o teste qui-quadrado, teste de Kruskal-Wallis e modelo de regressão linear com splines cúbicos restritos para análises estatísticas. Resultados: A incidência de LRA-AC foi 10,1% no grupo exposto ao MCI e 12,4% no grupo controle ao usar o critério de aumento absoluto. A variação da creatinina em relação ao valor basal não foi significativamente diferente entre os grupos. Após ajuste para fatores basais, o uso de contraste não se correlacionou com pior função renal. Conclusão: A taxa de LRA-AC é muito baixa, caso exista, com MCIs mais novos, e a cautela excessiva quanto ao uso de contraste provavelmente não se justifica.

Risk factors for acute kidney injury in patients hospitalized with COVID-19 / Fatores de risco para lesão renal aguda em pacientes hospitalizados com COVID-19

Abstract Introduction: Acute kidney injury (AKI) occurs frequently in COVID-19 patients and is associated with greater morbidity and mortality. Knowing the risks of AKI allows for identification, prevention, and timely treatment. This study aimed to identify the risk factors associated with AKI in hospitalized patients. Methods: A descriptive, retrospective, cross-sectional, and analytical component study of adult patients hospitalized with COVID-19 from March 1 to December 31, 2020 was carried out. AKI was defined by the creatinine criteria of the KDIGO-AKI guidelines. Information, regarding risk factors, was obtained from electronic medical records. Results: Out of the 934 patients, 42.93% developed AKI, 60.59% KDIGO-1, and 9.9% required renal replacement therapy. Patients with AKI had longer hospital stay, higher mortality, and required more intensive care unit (ICU) admission, mechanical ventilation, and vasopressor support. Multivariate analysis showed that age (OR 1.03; 95% CI 1.02-1.04), male sex (OR 2.13; 95% CI 1.49-3.04), diabetes mellitus (DM) (OR 1.55; 95% CI 1.04-2.32), chronic kidney disease (CKD) (OR 2.07; 95% CI 1.06-4.04), C-reactive protein (CRP) (OR 1.02; 95% CI 1.00-1.03), ICU admission (OR 1.81; 95% CI 1.04-3.16), and vasopressor support (OR 7.46; 95% CI 3.34-16.64) were risk factors for AKI, and that bicarbonate (OR 0.89; 95% CI 0.84-0.94) and partial pressure arterial oxygen/inspired oxygen fraction index (OR 0.99; 95% CI 0.98-0.99) could be protective factors. Conclusions: A high frequency of AKI was documented in COVID-19 patients, with several predictors: age, male sex, DM, CKD, CRP, ICU admission, and vasopressor support. AKI occurred more frequently in patients with higher disease severity and was associated with higher mortality and worse outcomes.

RESUMO Introdução: Lesão renal aguda (LRA) ocorre frequentemente em pacientes com COVID-19 e associa-se a maior morbidade e mortalidade. Conhecer riscos da LRA permite a identificação, prevenção e tratamento oportuno. Este estudo teve como objetivo identificar fatores de risco associados à LRA em pacientes hospitalizados. Métodos: Realizou-se estudo descritivo, retrospectivo, transversal e de componente analítico de pacientes adultos hospitalizados com COVID-19 de 1º de março a 31 de dezembro, 2020. Definiu-se a LRA pelos critérios de creatinina das diretrizes KDIGO-LRA. Informações sobre fatores de risco foram obtidas de prontuários eletrônicos. Resultados: Dos 934 pacientes, 42,93% desenvolveram LRA, 60,59% KDIGO-1 e 9,9% necessitaram de terapia renal substitutiva. Pacientes com LRA apresentaram maior tempo de internação, maior mortalidade e necessitaram de mais internações em UTIs, ventilação mecânica e suporte vasopressor. A análise multivariada mostrou que idade (OR 1,03; IC 95% 1,02-1,04), sexo masculino (OR 2,13; IC 95% 1,49-3,04), diabetes mellitus (DM) (OR 1,55; IC 95% 1,04-2,32), doença renal crônica (DRC) (OR 2,07; IC 95% 1,06-4,04), proteína C reativa (PCR) (OR 1,02; IC 95% 1,00-1,03), admissão em UTI (OR 1,81; IC 95% 1,04-3,16) e suporte vasopressor (OR 7,46; IC 95% 3,34-16,64) foram fatores de risco para LRA, e que bicarbonato (OR 0,89; IC 95% 0,84-0,94) e índice de pressão parcial de oxigênio arterial/fração inspirada de oxigênio (OR 0,99; IC 95% 0,98-0,99) poderiam ser fatores de proteção. Conclusões: Documentou-se alta frequência de LRA em pacientes com COVID-19, com diversos preditores: idade, sexo masculino, DM, DRC, PCR, admissão em UTI e suporte vasopressor. LRA ocorreu mais frequentemente em pacientes com maior gravidade da doença e associou-se a maior mortalidade e piores desfechos.

Acidosis láctica en un paciente usuario de metformina / Metformin-associated lactic acidosis

Metformin is a hypoglycemic agent used as the first line for the treatment of non-insulin dependent Diabetes Mellitus. While it is a generally safe drug, it has an infrequent adverse reaction called lactic acidosis. We report a 49 year-old patient with non-insulin-requiring type 2diabetes who developed an acute kidney failure injury along with severe metabolic acidosis secondary to pneumonia during treatment.

La metformina es un agente hipoglucemiante que se ocupa de primera línea para el tratamiento de la Diabetes Mellitus no insulino dependiente. Si bien es un medicamento bien tolerado, tiene una reacción adversa bastante infrecuente que es la acidosis láctica. Reportamos el caso de una paciente de 49 años insulino no dependiente que desarrolló una injuria renal aguda junto con acidosis metabólica severa secundaria a una neumonía en tratamiento.

Pediatric nephrologist-intensivist interaction in acute kidney injury / Interação nefro-intensivista pediátrica na lesão renal aguda

ABSTRACT Introduction: Acute Kidney Injury (AKI) in the Intensive Care Unit (ICU) have concepts of diagnosis and management have water balance as their main point of evaluation. In our ICU, from 2004 to 2012, the nephrologist's participation was on demand only; and as of 2013 their participation became continuous in meetings to case discussion. The aim of this study was to establish how an intense nephrologist/intensivist interaction influenced the frequency of dialysis indication, fluid balance and pRIFLE classification during these two observation periods. Methods: Retrospective study, longitudinal evaluation of all children with AKI undergoing dialysis (2004 to 2016). Parameters studied: frequency of indication, duration and volume of infusion in the 24 hours preceding dialysis; diuresis and water balance every 8 hours. Non-parametric statistics, p ≤ 0.05. Results: 53 patients (47 before and 6 after 2013). There were no significant differences in the number of hospitalizations or cardiac surgeries between the periods. After 2013, there was a significant decrease in the number of indications for dialysis/year (5.85 vs. 1.5; p = 0.000); infusion volume (p = 0.02), increase in the duration of dialysis (p = 0.002) and improvement in the discrimination of the pRIFLE diuresis component in the AKI development. Conclusion: Integration between the ICU and pediatric nephrology teams in the routine discussion of cases, critically approaching water balance, was decisive to improve the management of AKI in the ICU.

RESUMO Introdução: Os conceitos sobre diagnóstico e conduta da Lesão Renal Aguda (LRA) na Unidade de Terapia Intensiva (UTI) tem como ponto primordial a avaliação do balanço hídrico. Em nossa UTI, de 2004 a 2012, a participação do nefrologista era sob demanda. A partir de 2013, a participação passou a ser contínua em reunião de discussão de casos. O objetivo deste estudo foi determinar como a maior interação nefrologista/intensivista influenciou a frequência de indicação de diálise, no balanço hídrico e na classificação pRIFLE durante esses dois períodos de observação. Método: Estudo retrospectivo, avaliação longitudinal de todas as crianças com LRA em diálise (2004 a 2016). Parâmetros estudados: frequência de indicação, tempo de duração e volume de infusão nas 24 horas precedendo a diálise; diurese e balanço hídrico a cada 8 horas. Estatística não paramétrica, p ≤ 0,05. Resultado: 53 pacientes (47 antes e 6 após 2013). Sem diferença significativa no número de internações e nem de cirurgias cardíacas entre os períodos. Após 2013, houve diminuição significativa no número de indicação de diálise/ano (5,85 vs. 1,5; p = 0,000); no volume de infusão (p = 0,02), aumento do tempo de duração da diálise (p = 0,002) e melhora da discriminação do componente diurese do pRIFLE na indicação de LRA. Conclusão: Integração entre equipes de UTI e nefrologia pediátrica na discussão rotineira de casos, abordando criticamente o balanço hídrico, foi determinante para a melhora na conduta da LRA na UTI.

Case fatality rate among COVID-19 patients treated with acute kidney replacement therapy / Letalidade entre pacientes com injúria renal aguda por COVID-19 tratados com suporte renal artificial

Abstract Introduction: Acute kidney injury (AKI) is a frequent complication of severe COVID-19 and is associated with high case fatality rate (CFR). However, there is scarcity of data referring to the CFR of AKI patients that underwent kidney replacement therapy (KRT) in Brazil. The main objective of this study was to describe the CFR of critically ill COVID-19 patients treated with acute kidney replacement therapy (AKRT). Methods: Retrospective descriptive cohort study. We included all patients treated with AKRT at an intensive care unit in a single tertiary hospital over a 15-month period. We excluded patients under the age of 18 years, patients with chronic kidney disease on maintenance dialysis, and cases in which AKI preceded COVID-19 infection. Results: A total of 100 out of 1479 (6.7%) hospitalized COVID-19 patients were enrolled in this study. The median age was 74.5 years (IQR 64 - 82) and 59% were male. Hypertension (76%) and diabetes mellitus (56%) were common. At the first KRT prescription, 85% of the patients were on invasive mechanical ventilation and 71% were using vasoactive drugs. Continuous veno-venous hemodiafiltration (CVVHDF) was the preferred KRT modality (82%). CFR was 93% and 81 out of 93 deaths (87%) occurred within the first 10 days of KRT onset. Conclusion: AKRT in hospitalized COVID-19 patients resulted in a CFR of 93%. Patients treated with AKRT were typically older, critically ill, and most died within 10 days of diagnosis. Better strategies to address this issue are urgently needed.

Resumo Introdução: Injúria renal aguda (IRA) é uma complicação frequente da COVID-19 grave e está associada a alta taxa de letalidade (TL). Entretanto, há escassez de dados referentes à TL de pacientes com IRA submetidos a suporte renal artificial (SRA) no Brasil. O objetivo principal deste estudo foi descrever a TL de pacientes graves com IRA por COVID-19 tratados com SRA. Métodos: Estudo de coorte descritivo retrospectivo. Incluímos todos os pacientes tratados com SRA em unidade de terapia intensiva de um único hospital terciário por 15 meses. Excluímos pacientes menores de 18 anos, pacientes com doença renal crônica em diálise de manutenção e casos nos quais a IRA precedeu a infeção por COVID-19. Resultados: Incluímos neste estudo um total de 100 dos 1479 (6,7%) pacientes hospitalizados com COVID-19. A mediana de idade foi 74,5 anos (IIQ 64 - 82) e 59% eram homens. Hipertensão (76%) e diabetes mellitus (56%) foram comuns. Na primeira prescrição de SRA, 85% dos pacientes estavam em ventilação mecânica invasiva e 71% em uso de drogas vasoativas. A hemodiafiltração contínua foi a modalidade de SRA preferida (82%). A TL foi de 93% e 81 dos 93 óbitos (87%) ocorreram nos primeiros 10 dias do início da SRA. Conclusão: O SRA em pacientes hospi­talizados com IRA por COVID-19 resultou em TL de 93%. Os pacientes tratados com SRA eram geralmente idosos, gravemente enfermos e a maioria foi a óbito em até 10 dias após o diagnóstico. Estratégias melhores para abordar esse problema são urgentemente necessárias.

Acute kidney injury and hypercalcemia associated with veterinary supplements applications in adult man / Injúria renal aguda e hipercalcemia associadas a aplicações de suplementos veterinários em homem adulto

The compound "ADE" is an injectable oil for veterinary use which contains large amounts of vitamins A, D and E. The parenteral application in humans leads to a granuloma reaction which triggers hypercalcemia. A 42-year-old man was admitted with lower limb pain, nephrolithiasis and nephrocalcinosis. Laboratory tests revealed creatinine 4.59 mg/dl, calcium 13.3 mg/dl and parathormone 13.8 pg/ml. He underwent an ureterolithotripsy, stent placement, intravenous crystalloid fluids, and corticosteroid. He improved symptoms, kidney function and normalized serum calcium. The "ADE"-induced hypercalcemia diagnosis can be challenging. The early diagnosis may avoid negative outcomes.

O composto "ADE'' é um óleo veterinário injetável que contém grandes quantidades de vitaminas A, D e E. A aplicação parenteral causa reação granulomatosa e hipercalcemia. Um homem de 42 anos foi admitido com dor no membro inferior, nódulos musculares endurecidos, nefrolitíase e nefrocalcinose. O laboratório revelou creatinina 4,59 mg/dl, cálcio 13,3 mg/dl e paratormônio 13,8 pg/ml. Foi tratado com ureterolitotripsia, cateter duplo-J, cristaloide intravenoso e corticoterapia. Ele apresentou melhora dos sintomas, função renal e normalizou cálcio. O diagnóstico da hipercalcemia pelo "ADE'' pode ser desafiador. O diagnóstico precoce pode evitar desfechos negativos.

Lesão renal aguda em pacientes adultos com COVID-19: revisão integrativa / Lesión renal aguda en pacientes adultos con COVID-19: revisión integradora / Acute kidney injury in adult patients with COVID-19: an integrative review

Resumo Objetivo Identificar a frequência de lesão renal aguda (LRA) em pacientes hospitalizados com COVID-19, as características associadas, a mortalidade e a letalidade. Métodos Revisão realizada nas bases de dados CINAHL, Embase, LILACS, Livivo, PubMed, SCOPUS, Web of Science e, na literatura cinzenta (Google Acadêmico) em 12 de janeiro de 2022. Foram incluídos artigos em inglês, espanhol e português, publicados a partir de novembro 2019 até janeiro de 2022, em pacientes maiores de 18 anos com COVID-19 hospitalizados e LRA conforme critério Kidney Disease Improving Global Outcomes (KDIGO). Os estudos selecionados foram lidos na íntegra para extração, interpretação, síntese e categorização conforme nível de evidência. Resultados 699 artigos encontrados e 45 incluídos. A idade avançada, sexo masculino, hipertensão, doença renal crônica, ventilação mecânica, aumento da proteína C reativa, uso de drogas vasoativas e de determinadas classes de anti-hipertensivos foram associados a LRA. A LRA está relacionada à maior frequência de mortalidade. Em 30% dos pacientes hospitalizados com COVID-19 houve LRA. A taxa de mortalidade por LRA foi de 5% e a letalidade de 18%. Conclusão Estes resultados ressaltam a relevância da LRA como uma complicação significativa da COVID-19 e sugerem que um controle mais cuidadoso e precoce dos fatores associados poderia potencialmente reduzir a mortalidade e a letalidade. É crucial intensificar a pesquisa nesse campo para esclarecer melhor os mecanismos envolvidos na lesão renal em pacientes com COVID-19, bem como identificar estratégias terapêuticas mais efetivas para sua prevenção e tratamento nesse contexto.

Resumen Objetivo Identificar la frecuencia de lesión renal aguda (LRA) en pacientes hospitalizados con COVID-19, las características relacionadas, la mortalidad y la letalidad. Métodos Revisión realizada en las bases de datos CINAHL, Embase, LILACS, Livivo, PubMed, SCOPUS, Web of Science y en la literatura gris (Google Académico) el 12 de enero de 2022. Se incluyeron artículos en inglés, español y portugués, publicados a partir de noviembre de 2019 hasta enero de 2022, con pacientes mayores de 18 años con COVID-19 hospitalizados y LRA de acuerdo con el criterio Kidney Disease Improving Global Outcomes (KDIGO). Los estudios seleccionados fueron leídos en su totalidad para extracción, interpretación, síntesis y categorización según el nivel de evidencia. Resultados Se encontraron 699 artículos y se incluyeron 45. Los factores relacionados con la LRA fueron: edad avanzada, sexo masculino, hipertensión, enfermedad renal crónica, ventilación mecánica, aumento de la proteína C reactiva, uso de drogas vasoactivas y de determinadas clases de antihipertensivos. La LRA está relacionada con mayor frecuencia de mortalidad. En el 30 % de los pacientes hospitalizados con COVID-19 hubo LRA. La tasa de mortalidad por LRA fue de 5 % y la letalidad de 18 %. Conclusión Estos resultados resaltan la relevancia de la LRA como una complicación significativa de COVID-19 y sugieren que un control más cuidadoso y temprano de los factores asociados podría reducir potencialmente la mortalidad y la letalidad. Es crucial intensificar la investigación en este campo para explicar mejor los mecanismos relacionados con la lesión renal en pacientes con COVID-19, así como identificar estrategias terapéuticas más efectivas para su prevención y tratamiento en este contexto.

Abstract Objective To identify the frequency of acute kidney injury (AKI) in patients hospitalized with COVID-19, associated characteristics, mortality and lethality. Methods Integrative review carried out in the databases CINAHL, Embase, LILACS, Livivo, PubMed, SCOPUS, Web of Science and in the grey literature (Google Scholar) on January 12, 2022. Articles were included in English, Spanish and Portuguese, published from November 2019 to January 2022, in hospitalized patients over 18 years old with COVID-19 and AKI according to the Kidney Disease Improving Global Outcomes (KDIGO) criteria. The selected studies were read in full for extraction, interpretation, synthesis and categorization according to the level of evidence. Results A total of 699 articles were found and 45 included. Older age, male gender, hypertension, chronic kidney disease, mechanical ventilation, increased C-reactive protein, use of vasoactive drugs and certain classes of antihypertensives were associated with AKI. AKI is related to a higher frequency of mortality. AKI occurred in 30% of patients hospitalized with COVID-19. The mortality rate from AKI was 5% and the case fatality rate was 18%. Conclusion These results highlight the relevance of AKI as a significant complication of COVID-19 and suggest that more careful and early control of associated factors could potentially reduce mortality and lethality. It is crucial to intensify research in this field to better clarify the mechanisms involved in kidney injury in COVID-19 patients, as well as to identify more effective therapeutic strategies for its prevention and treatment in this context.

Lesão renal aguda e COVID-19 em adultos jovens na terapia intensiva / Lesión renal aguda y COVID-19 en adultos jóvenes en cuidados intensivos / Acute kidney injury and COVID-19 in young adults in intensive care

Resumo Objetivo Descrever a prevalência de lesão renal aguda em adultos jovens com diagnóstico da COVID-19 admitidos em unidade terapia intensiva. Métodos Estudo retrospectivo, quantitativo e analítico. A amostra foi de adultos jovens (20 a 40 anos) admitidos em unidades de terapia intensiva, com diagnóstico de infecção por SARS-CoV-2 entre março e dezembro de 2020. Os dados foram obtidos por meio do prontuário eletrônico, e a lesão renal aguda foi definida pelo valor da creatinina, segundo critérios das diretrizes da Kidney Disease Improving Global Outcomes. A significância estatística foi de p≤0,05. Resultados Foram internados 58 adultos jovens, sendo 63,8% do sexo masculino. A hipertensão arterial sistêmica esteve presente em 39,6%, a obesidade em 18,9% e o diabetes mellitus em 8,6%. A lesão renal aguda foi identificada em 55,1%, sendo o estágio 3 predominante em 43,1% deles. Nesses pacientes, o uso de ventilação mecânica e de drogas vasoativas foi significativo em 92%, assim como a disfunção orgânica respiratória (80%), seguida da renal (76%). Fatores de risco, como transplante renal ou doença renal crônica e obesidade, aumentaram em 12,3 e 9,0 vezes, respectivamente, a chance de desenvolver lesão renal aguda. Conclusão Este estudo demonstrou alta prevalência de lesão renal em adultos jovens e sua associação com comorbidades prévias. Obesidade, transplante renal e doença renal crônica elevaram a chance de o adulto jovem desenvolver lesão renal aguda, resultando em desfechos a favor da morbimortalidade.

Resumen Objetivo Describir la prevalencia de lesión renal aguda en adultos jóvenes con diagnóstico de COVID-19 admitidos en unidad de cuidados intensivos. Métodos Estudio retrospectivo, cuantitativo y analítico. La muestra fue de adultos jóvenes (20 a 40 años) admitidos en unidades de cuidados intensivos, con diagnóstico de infección por SARS-CoV-2 entre marzo y diciembre de 2020. Los datos se obtuvieron por medio de historias clínicas electrónicas, y la lesión renal aguda fue definida por el valor de la creatinina, de acuerdo con criterios de las directrices de la Kidney Disease Improving Global Outcomes. La significación estadística fue de p≤0,05. Resultados Hubo 58 adultos jóvenes internados, el 63,8 % de sexo masculino. La hipertensión arterial sistémica estuvo presente en el 39,6 %, la obesidad en el 18,9 % y la diabetes mellitus en el 8,6 %. Se identificó lesión renal aguda en el 55,1 %, de nivel 3 como predominante en el 43,1 % de los casos. En esos pacientes, el uso de ventilación mecánica y de drogas vasoactivas fue significativo en el 92 %, así como también la disfunción orgánica respiratoria (80 %), seguida de la renal (76 %). Los factores de riesgo, como trasplante renal o enfermedad renal crónica y obesidad, aumentaron 12,3 y 9,0 veces respectivamente la probabilidad de presentar lesión renal aguda. Conclusión Este estudio demostró alta prevalencia de lesión renal en adultos jóvenes y su asociación con comorbilidades previas. La obesidad, el trasplante renal y la enfermedad renal crónica aumentaron la probabilidad de que los adultos jóvenes presenten lesión renal aguda, lo que da como resultado desenlaces a favor de la morbimortalidad.

Abstract Objective To describe acute kidney injury prevalence in young adults diagnosed with COVID-19 admitted to the Intensive Care Unit. Methods This is a retrospective, quantitative and analytical study. The sample consisted of young adults (20 to 40 years old) admitted to Intensive Care Units, diagnosed with SARS-CoV-2 infection between March and December 2020. Data were obtained through electronic medical records, and kidney injury acute was defined by the creatinine value, according to the Kidney Disease Improving Global Outcomes guidelines criteria. Statistical significance was p≤0.05. Results A total of 58 young adults were hospitalized, 63.8% of whom were male. Hypertension was present in 39.6%, obesity in 18.9%, and diabetes mellitus in 8.6%. Acute kidney injury was identified in 55.1%, with stage 3 predominating in 43.1% of them. In these patients, the use of mechanical ventilation and vasoactive drugs was significant in 92% as well as respiratory organ dysfunction (80%), followed by renal organ dysfunction (76%). Risk factors such as kidney transplantation or chronic kidney disease and obesity increased by 12.3 and 9.0 times, respectively, the chances of developing acute kidney injury. Conclusion This study demonstrated a high kidney injury prevalence in young adults and its association with previous comorbidities. Obesity, kidney transplantation and chronic kidney disease increased the chance of young adults to develop acute kidney injury, resulting in outcomes in favor of morbidity and mortality.

Outcomes of Transcatheter Aortic Valve Implantation in Patients with and without Diabetes Mellitus

ABSTRACT Introduction: Diabetes mellitus (DM) in patients undergoing cardiac transcatheter or surgical interventions usually is correlated with poor outcomes. Transcatheter aortic valve implantation (TAVI) has been developed as a therapy choice for inoperable, high-, or intermediate-risk surgical patients with severe aortic stenosis (AS). Objective: To evaluate the impact of DM and hemoglobin A1c (HbA1c) on outcomes and survival after TAVI. Methods: Five hundred and fifty-two symptomatic severe AS patients who underwent TAVI, of whom 164 (29.7%) had DM, were included in this retrospective study. Follow-up was performed after 30 days, six months, and annually. Results: The device success and risks of procedural-related complications were similar between patients with and without DM, except for acute kidney injury, which was more frequent in the DM group (2.4% vs. 0%, P=0.021). In-hospital and first-year mortality were similar between the groups (4.9% vs. 3.6%, P=0.490 and 15.0% vs. 11.2%, P=0.282, respectively). There was a statistical difference between HbA1c ≥ 6.5 and HbA1c ≤ 6.49 groups in total mortality (34.4% vs. 15.8%, P<0.001, respectively). The only independent predictors were Society of Thoracic Surgeons score (hazard ratio [HR] 1.28, 95% confidence interval [CI] 1.09-1.51; P=0.003) and HbA1c level ≥ 6.5 (HR 10.78, 95% CI 2.58-21.50; P=0.003) in multivariable logistic regression analysis. Conclusion: In this study, we conclude that DM was not correlated with an increased mortality risk or complication rates after TAVI. Also, it was shown that mortality was higher in patients with HbA1c ≥ 6.5, and it was an independent predictor for long-term mortality.

Acute renal failure, COVID-19 and deaths, worrying rates in intensive care units: a cross-sectional study

ABSTRACT BACKGROUND: Acute kidney failure is a serious consequence of coronavirus disease 2019 (COVID-19). OBJECTIVES: To identify the prevalence of COVID-19, kidney failure, frequency of death, and associated factors in patients receiving intensive care. DESIGN AND SETTING: Analytical cross-sectional study conducted in the intensive care unit (ICU) of a medium-sized philanthropic general hospital in center-west Minas Gerais. METHODS: Adults and older individuals who underwent real-time polymerase chain reaction testing for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) were evaluated by the nephrology team. RESULTS: Among the 176 patients, the prevalence of COVID-19 and acute kidney injury (AKI) were 103 (58.5%) and 132 (75%), respectively, and 44 (25%) had chronic kidney disease (CKD) and 16 (15,5%) were positive for SARS-CoV-2. In the Charlson index classification, which estimates the risk of death, a statistically significant difference was identified in the percentages of groups with and without COVID-19 for indices 0, 1, and 2. There was a significant association between kidney disease and ICU mortality (P < 0.05). Patients with CKD had fewer fatal outcomes (13/97, 13.4%) than those with AKI (85/97, 87.6%). CONCLUSIONS: COVID-19 rates remained high long after diagnosis and prevention of SARS-CoV-2 infection. In addition, a higher death rate among patients who developed AKI, whose prevalence was also greater than that in the national literature, regardless of the presence of COVID-19, revealed a worrying scenario and corroborated the need for early and judicious approaches to preserve the lives of patients with AKI admitted to intensive care units.

Identificación de Factores Clínicos Relacionados a una Mayor Mortalidad Asociada a Insuficiencia Renal Aguda en pacientes de Terapia Intensiva

La insuficiencia renal aguda (IRA) es una de las complicaciones más frecuentes en los pacientes hospitalizados, siendo un factor de riesgo de mortalidad. Es de suma importancia identificar la asociación de factores clínicos que empeoran la mortalidad en pacientes con IRA internados en una unidad de terapia intensiva (UTI). Se incluyeron 218 pacientes, de los cuales el 63,7% (n=139) correspondieron a hombres con un promedio de edad de 43±19 años. El análisis de correlación de variables de control, dependiente e independiente fue a través del coeficiente de Spearman y el OR fue analizado mediante regresión logística. De los 218 pacientes, falleció el 33% (n=72) de los pacientes internados en UTI. La IRA ocurrió en 28,4% (n=62) del total de pacientes y de estos, el 61,3% (n=38) fallecieron, con un OR de 4,94 (p 0,0001). La mayor proporción de fallecidos perteneció a la categoría AKIN 3. Las variables clínicas de ventilación mecánica (PR 3,57, IC 95%, 0,34-37,93), uso de drogas vasoactivas (PR 8,32, IC 95%, 3,20-21,64), puntuación APACHE III (PR 1,12, IC 95%, 1,03-1,23), edad (PR 1,01, IC 95%, 0,99-1,04) y los sometidos a cirugía (PR 0,28, IC 95%, 0,10-0,80) tuvieron asociación positiva y aumentaron la mortalidad. La presencia de variables clínicas de ventilación mecánica, la utilización de drogas vasoactivas, sepsis, el estudio APACHE III, la edad, la categoría AKIN 3, y el antecedente de cirugía previo al ingreso a UTI aumentan significativamente la mortalidad en pacientes con IRA en UTI.

Acute renal failure (ARF) is one of the most frequent complications in hospitalized patients and is a risk factor for mortality. It is extremely important to identify the association of clinical factors that worsen mortality in patients with ARF admitted to an intensive care unit (ICU). A total of 218 patients were included, of which 63.7% (n=139) were men with a mean age of 43±19 years. The correlation analysis of control, dependent, and independent variables was done through Spearman's coefficient and the OR was analyzed through logistic regression. Of the 218 patients, 33% (n=72) died in the ICU. ARF occurred in 28.4% (n=62) of all patients and of these, 61.3% (n=38) died, with an OR of 4.94 (p 0.0001). The highest proportion of deceased patients were in the AKIN 3 category. The clinical variables of mechanical ventilation (PR 3.57, 95% CI, 0.34-37.93), use of vasoactive drugs (PR 8.32, 95% CI, 3.20-21.64), APACHE III score (PR 1.12, 95% CI, 1.03-1.23), age (PR 1.01, 95% CI, 0.99-1.04) and those who underwent surgery (PR 0.28, 95% CI, 0.10-0.80) had a positive association and increased mortality. The presence of clinical variables of mechanical ventilation, the use of vasoactive drugs, sepsis, APACHE III stage, age, AKIN 3 category, and a history of surgery before admission to the ICU significantly increase mortality in patients with ARF in ICU.

Can adalimumab prevent from acute effects of lipopolysaccharide induced renal injury in rats?

Purpose: Lipopolysaccharides is well-known in the acute renal injury process. It causes widespread activation of inflammatory cascades. Tumor necrosis factor (TNF)-α and interleukin (Il)-6 are essential proinflammatory cytokines that can induce the production of other cytokines in host response. Adalimumab suppresses TNF-α, IL-1ß, and IL-6. We aimed to evaluate whether adalimumab would prevent the toxicity of lipopolysaccharide on the rat renal tissue. Methods: Adult female Wistar rats were divided into four groups. To the control group, only intraperitoneal saline injection procedure was carried out. For adalimumab group, adalimumab was injected at a dose for two days. For lipopolysaccharide group, animals were injected with lipopolysaccharide (a dose). For lipopolysaccharide-adalimumab group, animals were given adalimumab treatment before the injection of lipopolysaccharide. Histopathological changes and immunohistochemical analysis for TNF-α and IL-6 were determined. Results: The pathological changes and immunohistochemical staining for TNF-α or IL-6 were similar for control and adalimumab groups (p > 0.05). The lipopolysaccharide group had significantly higher distorted features in the renal tissues (p < 0.001), and also significantly prominent immunohistochemical staining for TNF-α or IL-6 (0.003), compared to the control group. No severe pathological feature was detected in the lipopolysaccharide-adalimumab group, but moderate necrosis was found in all cases (p = 0.003). TNF-α staining and IL-6 staining in the lipopolysaccharide group was found to significantly prominent compared to lipopolysaccharide-adalimumab group (p = 0.013). Conclusions: Because of its anti-inflammatory property, adalimumab pretreatment may have protective effects on experimental kidney injury. Adalimumab could be considered as a protective agent to acute effects of lipopolysaccharide induced renal injury.

Hemadsorption to Contain Postoperative Cell-Free Hemoglobin and Haptoglobin Preservation for Extended Cardiopulmonary Bypass Time in Cardiac Surgery for Acute Kidney Injuries Prevention

ABSTRACT Introduction: Prevention of acute kidney injury during cardiopulmonary bypass (CPB) is still a challenge and has been the object of numerous studies. The incidence of acute kidney injury in the context of CPB is related to a multifactorial etiology. The role of hemadsorption in relation to cell-free hemoglobin and haptoglobin preservation is not well defined in the literature on CPB during cardiac surgery procedures. Methods: This is a single-center pilot randomized report including 20 patients undergoing elective CPB procedures with an expected time > 120 minutes for each extracorporeal procedure. Patients were randomly allocated to either standard of care (n=10) or Jafron HA380 (n=10) during CPB. The primary outcome measured was the incidence of postoperative acute kidney injuries. Results: The Jafron study group vs. control group reported postoperative values for cell-free hemoglobin at 10 minutes after CPB (mg/L) (11.6 ± 0.6 vs. 29.9 ± 0.3) (P-value 0.021), haptoglobin 10 minutes after CPB (mg/dl) (129.16 ± 1.22 vs. 59.17 ± 1.49) (P-value 0.017), creatinine peak after CPB (mg/dL) (0.92 ± 0.17 vs. 1.32 ± 0.9) (P-value 0.030), and acute kidney injury after 48 hours (number of patients) (one vs. four) (P-value 0.027). Conclusion: This pilot study suggested that the use of Hemoperfusion Cartridge HA380 Jafron for extended CPB time for complex cardiac surgery procedures was safe and effective and is associated with a better postoperative preservation of haptoglobin with a reduction of cell-free hemoglobin values and less incidence of acute kidney injury, though larger studies are warranted to confirm our result.

Does dexmedetomidine reduce the risk of acute kidney injury after cardiac surgery? A meta-analysis of randomized controlled trials

Abstract Background: Acute Kidney Injury (AKI) is a common complication after cardiac surgery and has been associated with poor outcomes. Dexmedetomidine (DEX) has been shown to confer direct renoprotection based on some animal and clinical studies, but data from other trials came to the opposite conclusion following cardiac surgery. This meta-analysis was conducted to evaluate the effects of perioperative DEX administration on the occurrence of AKI and the outcomes after cardiac surgery. Methods: We searched databases including EMBASE, PubMed, and Cochrane CENTRAL for Randomized Controlled Trials (RCTs) focused on DEX for AKI in adult patients after cardiac surgery. The primary outcome was incidence of AKI. Secondary outcomes were Mechanical Ventilation (MV) duration, Intensive Care Unit (ICU) Length Of Stay (LOS), hospital LOS and mortality. Results: Fifteen trials enrolling 2907 study patients were collected in the meta-analyses. Compared with controls, DEX reduced the incidence of postoperative AKI (Odds Ratio [OR = 0.66]; 95% Confidence Interval [95% CI 0.48-0.91]; p = 0.01), and there was no significant difference between groups in postoperative mortality (OR = 0.63; 95% CI 0.32-1.26; p = 0.19), MV duration (Weighted Mean Difference [WMD = -0.44]; 95% CI -1.50-0.63; p = 0.42), ICU LOS (WMD = -1.19; 95% CI -2.89-0.51; p = 0.17), and hospital LOS (WMD = -0.31; 95% CI -0.76-0.15; p = 0.19). Conclusions: Perioperative DEX reduced the incidence of postoperative AKI in adult patients undergoing cardiac surgery. No significant decrease existed in mortality, MV duration, ICU LOS and hospital LOS owing to DEX administration.

Factors associated with carbon dioxide transfer in an experimental model of severe acute kidney injury and hypoventilation during high bicarbonate continuous renal replacement therapy and oxygenation membrane support / Fatores associados à transferência de dióxido de carbono em um modelo experimental de lesão renal aguda grave e hipoventilação durante terapia de substituição renal contínua com alto teor de bicarbonato e suporte com membrana de oxigenação

ABSTRACT Objective To investigate the factors influencing carbon dioxide transfer in a system that integrates an oxygenation membrane in series with high-bicarbonate continuous veno-venous hemodialysis in hypercapnic animals. Methods In an experimental setting, we induced severe acute kidney injury and hypercapnia in five female Landrace pigs. Subsequently, we initiated high (40mEq/L) bicarbonate continuous veno-venous hemodialysis with an oxygenation membrane in series to maintain a pH above 7.25. At intervals of 1 hour, 6 hours, and 12 hours following the initiation of continuous veno-venous hemodialysis, we performed standardized sweep gas flow titration to quantify carbon dioxide transfer. We evaluated factors associated with carbon dioxide transfer through the membrane lung with a mixed linear model. Results A total of 20 sweep gas flow titration procedures were conducted, yielding 84 measurements of carbon dioxide transfer. Multivariate analysis revealed associations among the following (coefficients ± standard errors): core temperature (+7.8 ± 1.6 °C, p < 0.001), premembrane partial pressure of carbon dioxide (+0.2 ± 0.1/mmHg, p < 0.001), hemoglobin level (+3.5 ± 0.6/g/dL, p < 0.001), sweep gas flow (+6.2 ± 0.2/L/minute, p < 0.001), and arterial oxygen saturation (-0.5 ± 0.2%, p = 0.019). Among these variables, and within the physiological ranges evaluated, sweep gas flow was the primary modifiable factor influencing the efficacy of low-blood-flow carbon dioxide removal. Conclusion Sweep gas flow is the main carbon dioxide removal-related variable during continuous veno-venous hemodialysis with a high bicarbonate level coupled with an oxygenator. Other carbon dioxide transfer modulating variables included the hemoglobin level, arterial oxygen saturation, partial pressure of carbon dioxide and core temperature. These results should be interpreted as exploratory to inform other well-designed experimental or clinical studies.

RESUMO Objetivo Investigar os fatores que influenciam a transferência de dióxido de carbono em um sistema que integra uma membrana de oxigenação em série com terapia de substituição renal contínua com alto teor de bicarbonato em animais hipercápnicos. Métodos Em um ambiente experimental, induzimos lesão renal aguda grave e hipercapnia em cinco porcos Landrace fêmeas. Em seguida, iniciamos terapia de substituição renal contínua com alto teor de bicarbonato (40mEq/L) com uma membrana de oxigenação em série para manter o pH acima de 7,25. Em intervalos de 1 hora, 6 horas e 12 horas após o início da terapia de substituição renal contínua, realizamos uma titulação padronizada do fluxo de gás de varredura para quantificar a transferência de dióxido de carbono. Avaliamos os fatores associados à transferência de dióxido de carbono através da membrana pulmonar com um modelo linear misto. Resultados Realizamos 20 procedimentos de titulação do fluxo de gás de varredura, produzindo 84 medições de transferência de dióxido de carbono. A análise multivariada revelou associações entre os seguintes itens (coeficientes ± erros padrão): temperatura central (+7,8 ± 1,6 °C, p < 0,001), pressão parcial pré-membrana de dióxido de carbono (+0,2 ± 0,1mmHg, p < 0,001), nível de hemoglobina (+3,5 ± 0,6g/dL, p < 0,001), fluxo de gás de varredura (+6,2 ± 0,2L/minuto, p < 0,001) e saturação de oxigênio (-0,5% ± 0,2%, p = 0,019). Entre essas variáveis, e dentro das faixas fisiológicas avaliadas, o fluxo do gás de varredura foi o principal fator modificável que influenciou a eficácia da remoção de dióxido de carbono de baixo fluxo sanguíneo. Conclusão O fluxo do gás de varredura é a principal variável relacionada à remoção de dióxido de carbono durante a terapia de substituição renal contínua com um alto nível de bicarbonato acoplado a um oxigenador. Outras variáveis moduladoras da transferência de dióxido de carbono incluíram o nível de hemoglobina, a saturação de oxigênio, a pressão parcial de dióxido de carbono e a temperatura central. Esses resultados devem ser interpretados como exploratórios para informar outros estudos experimentais ou clínicos bem planejados.