Outcomes in acute kidney injury in noncritically ill patients lately referred to nephrologist in a developing country: a comparison of AKIN and KDIGO criteria.

BACKGROUND: In low-middle-income countries (LMICs), data regarding acute kidney injury (AKI) are scarce. AKI patients experience delayed diagnosis. This study aimed to evaluate whether delayed nephrologist consultation (NC) affected outcomes of AKI patients and compare Acute Kidney Injury Network (AKIN) and Kidney Disease: Improving Global Outcomes (KDIGO). METHODS: An observational, retrospective study was conducted in a tertiary public hospital in an LMIC. RESULTS: Overall, 103 AKI patients were analysed. In-hospital mortality was 61.16%, and dialysis was required in 38.83%. NC took place after 48 h in 68.93% of the patients. Mean time for NC was 5.22 ± 4.30 days. At NC, serum creatinine was 4.48 (±3.40) mg/dL and blood urea nitrogen was 68.21 (± 35.02) mg/dL. The AKIN and KDIGO stage stratifications were identical; KDIGO stage 3 was seen in 58.25% of the patients. The group with NC >  4 days had a mortality rate of 74.46% and the group with NC ≤ 4 days had a mortality rate of 50% (p = 0.011). Multivariate analysis showed that haemodialysis was independently associated with mortality. NC >  4 days was associated with death [odds ratio 2.66 (95% confidence interval, 1.36-4.35), p = 0.001]. Logistic regression showed an OR of 1.20 (95% CI, 1.05-1.37) (p = 0.008) for each day of delayed NC. CONCLUSION: Delayed NC was associated with mortality even after adjustments, as was haemodialysis, though marginally. In AKI patients with NC > 4 days, there was a high prevalence of KDIGO stage 3, and AKIN and KDIGO criteria were identical.

Type 1 Cardiorenal Syndrome in Decompensated Heart Failure Patients in a Low-Income Region in Brazil: Incidence of Acute Kidney Injury (AKIN and KDIGO Criteria), Need for Dialysis and Mortality. / Síndrome Cardiorrenal Tipo 1 em Região de Baixo Desenvolvimento: Comparação entre os Critérios AKIN e KDIGO, Necessidade de Diálise e Mortalidade.

BACKGROUND: Type 1 cardiorenal syndrome is associated with higher mortality in heart failure patients. However, few studies have compared the diagnostic criteria of acute kidney injury (AKI) in this population. OBJECTIVE: To assess clinical and functional features and factors associated AKI in patients with heart failure. METHOD: Retrospective, cohort study on patients with decompensated heart failure or recent acute myocardial infarction, conducted in a tertiary hospital in a low-income region of Brazil. Clinical, laboratory and echocardiographic features were compared between patients with and without AKI according to the Acute Kidney Network (AKIN) and Kidney Disease: Improving Global Outcomes (KDIGO) criteria. The level of statistical significance was set at p < 0.05. RESULTS: Of 81 patients, 61.73% had AKI. Mean creatinine and urea levels were 1.79±1.0 mg/dL and 81.5±46.0 mg/dL, respectively, and higher in the group with AKI (p < 0.05). No evidence of a relationship between cardiac changes and reduced renal function. Chronic renal disease was associated with higher prevalence of AKI. Higher mortality was observed in patients with AKI than in patients without AKI (32.0% vs. 9.8%, p = 0.04, OR 8.187 ad 95% confidence interval 1.402-17.190, p = 0.020). CONCLUSION: In this population of patients with heart failure, AKI was highly prevalent and considered an independent risk factor for mortality. Cardiac changes were not associated with AKI, and the KDIGO and AKIN criteria showed similar performance.

FUNDAMENTO: A síndrome cardiorrenal tipo 1 associa-se a maior mortalidade em pacientes com insuficiência cardíaca (IC). No entanto, há escassez de publicações comparando critérios diagnósticos de lesão renal aguda (LRA). OBJETIVOS: Analisar o perfil clinicofuncional de pacientes com IC e fatores associados a ocorrência de lesão renal aguda (LRA). MÉTODOS: Estudo de coorte retrospectivo, em hospital terciário de região com baixo desenvolvimento econômico que incluiu pacientes com IC descompensada ou infarto agudo do miocárdio (IAM) recente, sendo avaliadas características clínicas, laboratoriais e ecocardiográficas comparativamente em pacientes com e sem LRA classificada pelos critérios Acute Kidney Network (AKIN) e Kidney Disease: Improving Global Outcomes (KDIGO). Nível de significância estatística com valor de p < 0,05. RESULTADOS: Entre 81 pacientes, 61,73% evoluíram com LRA. A média de creatinina foi 1,79±1,0 mg/dL e de ureia 81,5±46,0 mg/dL, sendo maior no grupo com LRA (p < 0,05). Não foi evidenciada relação entre alterações cardíacas e redução da função renal. A doença renal crônica se associou a maior ocorrência de LRA (38% x 3,23% sem LRA, p = 0,001). Não houve diferença do KDIGO com relação ao critério AKIN. Os pacientes que desenvolveram LRA apresentaram maior mortalidade (32% x 9,8% no grupo sem LRA, p = 0,04, com odds ratio (OR) de 8,187 e intervalo de confiança 1,402-17,190, p = 0,020). CONCLUSÃO: Nessa casuística de pacientes com IC, a ocorrência de LRA foi elevada e foi fator de risco independente de mortalidade. As alterações cardíacas não se associaram à ocorrência de LRA, e os critérios diagnósticos KDIGO e AKIN apresentaram performance similar.

High volume peritoneal dialysis for acute renal failure.

BACKGROUND: Peritoneal dialysis (PD) is still widely used for acute renal failure (ARF) in developing countries despite concerns about its inadequacy. Continuous PD has been evaluated in ARF by analyzing the resolution of metabolic abnormality and normalization of plasma pH, bicarbonate, and potassium. METHODOLOGY: A prospective study was performed on 30 ARF patients who were assigned to high-dose continuous PD (Kt/V = 0.65 per session) via a flexible catheter (Tenckhoff) and automated PD with a cycler. Fluid removal, pH and metabolic control, protein loss, and patient outcome were evaluated. RESULTS: Patients received 236 continuous PD sessions; 76% were admitted to ICUs. APACHE II score was 32.2+/-8.65. BUN concentrations stabilized after 3 sessions, creatinine after 4, and bicarbonate and pH after 2. Fluid removal was 2.1+/-0.62 L/day. Creatinine and urea clearances were 15.8+/-4.16 and 17.3+/-5.01 mL/minute respectively. Normalized creatinine clearance and urea Kt/V values were 110.6+/-22.5 L/week/1.73 m(2) body surface area and 3.8+/-0.6 respectively. Solute reduction index was 41%+/-6.5% per session. Serum albumin values remained stable in spite of considerable protein losses (median 21.7 g/day, interquartile range 9.1-29.8 g/day). Regarding ARF outcome, 23% of patients presented renal function recovery, 13% remained on dialysis after 30 days of follow-up, and 57% died. CONCLUSION: High-dose continuous PD by flexible catheter and cycler was an effective treatment for ARF. It provided high solute removal, allowing appropriate metabolic and pH control, and adequate dialysis dose and fluid removal. Continuous PD can therefore be considered an alternative to other forms of renal replacement therapy in ARF.

Síndrome cardiorrenal tipo 1 em região de baixo desenvolvimento: comparação entre os critérios akin e kdigo, necessidade de diálise e mortalidade / Type 1 cardiorenal syndrome in decompensated heart failure patients in a low-income region in brazil: incidence of acute kidney injury (akin and kdigo criteria), need for dialysis and mortality

Resumo Fundamento: A síndrome cardiorrenal tipo 1 associa-se a maior mortalidade em pacientes com insuficiência cardíaca (IC). No entanto, há escassez de publicações comparando critérios diagnósticos de lesão renal aguda (LRA). Objetivos: Analisar o perfil clinicofuncional de pacientes com IC e fatores associados a ocorrência de lesão renal aguda (LRA). Métodos: Estudo de coorte retrospectivo, em hospital terciário de região com baixo desenvolvimento econômico que incluiu pacientes com IC descompensada ou infarto agudo do miocárdio (IAM) recente, sendo avaliadas características clínicas, laboratoriais e ecocardiográficas comparativamente em pacientes com e sem LRA classificada pelos critérios Acute Kidney Network (AKIN) e Kidney Disease: Improving Global Outcomes (KDIGO). Nível de significância estatística com valor de p < 0,05. Resultados: Entre 81 pacientes, 61,73% evoluíram com LRA. A média de creatinina foi 1,79±1,0 mg/dL e de ureia 81,5±46,0 mg/dL, sendo maior no grupo com LRA (p < 0,05). Não foi evidenciada relação entre alterações cardíacas e redução da função renal. A doença renal crônica se associou a maior ocorrência de LRA (38% x 3,23% sem LRA, p = 0,001). Não houve diferença do KDIGO com relação ao critério AKIN. Os pacientes que desenvolveram LRA apresentaram maior mortalidade (32% x 9,8% no grupo sem LRA, p = 0,04, com odds ratio (OR) de 8,187 e intervalo de confiança 1,402-17,190, p = 0,020). Conclusão: Nessa casuística de pacientes com IC, a ocorrência de LRA foi elevada e foi fator de risco independente de mortalidade. As alterações cardíacas não se associaram à ocorrência de LRA, e os critérios diagnósticos KDIGO e AKIN apresentaram performance similar.

Abstract Background: Type 1 cardiorenal syndrome is associated with higher mortality in heart failure patients. However, few studies have compared the diagnostic criteria of acute kidney injury (AKI) in this population. Objective: To assess clinical and functional features and factors associated AKI in patients with heart failure. Method: Retrospective, cohort study on patients with decompensated heart failure or recent acute myocardial infarction, conducted in a tertiary hospital in a low-income region of Brazil. Clinical, laboratory and echocardiographic features were compared between patients with and without AKI according to the Acute Kidney Network (AKIN) and Kidney Disease: Improving Global Outcomes (KDIGO) criteria. The level of statistical significance was set at p < 0.05. Results: Of 81 patients, 61.73% had AKI. Mean creatinine and urea levels were 1.79±1.0 mg/dL and 81.5±46.0 mg/dL, respectively, and higher in the group with AKI (p < 0.05). No evidence of a relationship between cardiac changes and reduced renal function. Chronic renal disease was associated with higher prevalence of AKI. Higher mortality was observed in patients with AKI than in patients without AKI (32.0% vs. 9.8%, p = 0.04, OR 8.187 ad 95% confidence interval 1.402-17.190, p = 0.020). Conclusion: In this population of patients with heart failure, AKI was highly prevalent and considered an independent risk factor for mortality. Cardiac changes were not associated with AKI, and the KDIGO and AKIN criteria showed similar performance.

Early initiation of dialysis: mortality and renal function recovery in acute kidney injury patients / Início precoce da diálise: mortalidade e recuperação da função renal em pacientes com lesão renal aguda

INTRODUCTION: The decision of when to start dialysis in Acute Kidney Injury (AKI) patients with overt uremia is strongly established, however, when blood urea nitrogen (BUN) levels is < 100 mg/dL the timing of initiation of dialysis remains uncertain. Purpose: The aim of this study was to assess mortality and renal function recovery AKI patients started on dialysis at different BUN levels. METHODS: This was a retrospective study performed at Medical School Hospital, São Paulo, Brazil, enrolling 86 patients underwent to dialysis. RESULTS: Dialysis was started when BUN < 75 mg/dl in 23 patients (Group I) and BUN > 75 mg/dl in 63 patients (Group II). Hypervolemia and mortality were higher in Group I than in Group II (65.2% vs. 14.3% - p < 0.05, 39.1% vs. 68.9%- p < 0.05, respectively). Among survivors, the rate of renal function recovery was higher in Group I (71.4% and 36.8%, respectively - p < 0.05). Multivariate analysis showed that sepsis, age > 60 years, peritoneal dialysis and BUN > 75 mg/dl at dialysis initiation were independently related with mortality. CONCLUSIONS: Lower mortality and higher renal function recovery rates were associated with early dialysis initiated at lower BUN leves in AKI patients.

INTRODUÇÃO: A decisão de quando iniciar a diálise em pacientes com lesão renal aguda (LRA) que apresentam síndrome urêmica está bem estabelecida, entretanto, com ureia < 200 mg/dl o melhor momento para iniciar a diálise torna-se incerto. OBJETIVO: Este estudo teve como objetivo avaliar a mortalidade e a recuperação da função renal em pacientes com LRA, cujo início da diálise ocorreu em diferentes níveis de ureia. MÉTODOS: Estudo retrospectivo desenvolvido em hospital escola, no estado de São Paulo, Brasil, envolvendo 86 pacientes submetidos à diálise. RESULTADOS: A diálise foi iniciada com uréia > 150 mg/dl em 23 pacientes (grupo I) e uréia > 150 mg/dl em 63 pacientes (grupo II). Hipervolemia e mortalidade foram mais frequentes no grupo I que no grupo II (65,2 x 14,2% - p < 0,05; 39,1 x 68,9% - p < 0,05, respectivamente). Entre os sobreviventes, a recuperação renal foi maior no grupo I (71,4 e 36,8%, respectivamente, p < 0,05). A análise multivariada mostrou risco independente de mortalidade relacionado à sepse, idade > 60 anos, diálise peritoneal e uréia > 150 mg/dl no início da diálise. CONCLUSÃO: Menor mortalidade e maior recuperação renal estão associadas com o diálise iniciada precocemente, conforme baixos níveis de ureia, em pacientes com LRA.

Avaliação da mortalidade e recuperação renal de pacientes com insuficiência renal aguda submetidos à diálise com diferentes níveis de uréia / Evaluation of mortality and recovery of renal patients with acute renal failure undergoing dialysis with different levels of urea

Introdução: evidências apontam que o momento de início da diálise pode, influenciar diretamente a evolução de pacientes portadores de insuficiência renal Aguda (IRA). Assim, a diálise precoce surge como meio adicional para reduzir a mortalidade nestes pacientes. Porém, os parâmetros utilizados para o início da terapia substitutiva renal (TSR) nestes casos ainda não estão estabelecidos. Objetivo: avaliar se pacientes com IRA por Necrose tubular Aguda (NTA) submetidos a diálise com níveis baixos de uréia (inferior aos atualmente preconizados) apresentam menor mortalidade e maior recuperação renal comparados àqueles submetidos a TSR com uréia e elevada. Métodos: coorte retrospectiva de pacientes com IRA por NTA submetidos à diálise no período de março de 2001 a maio de 2006 no HC­ UNESP. Os pacientes foram alocados em 2 grupos de acordo com os valores de uréia no momento da indicação da diálise: GI: menor ou igual 150 e GII: maior que 150 mg/dl. IRA foi definida como um aumento de creatinina sérica maior que 30% do valor basal, excluídas causas pré-renais e pós-renais. Foram avaliados pacientes maior de 18 anos, em diálise por mais de 48 h e com ATN-ISS menor que 0,9 e acompanhados até óbito, recuperação da função renal ou tempo em diálise maior que 30 dias. Estatística: Testes T e Mann-Whitney (comparação entre grupos) e Qui-quadrado, Exato de Fisher e Goodman (proporções). Nível de significância de 5%. Resultados: Foram analisados 1561 pacientes, sendo excluídos 861 por não apresentarem IRA por NTA. Dos 700 restantes, 333 47,5%) foram submetidos a diálise, sendo excluídos 247. Os 86 pacientes restantes foram alocados em 2 grupos, sendo 23 em GI e 63 em GII.