Morbimortalidad del fracaso renal agudo en la Unidad de Cuidados Críticos de un hospital comarcal

Abstract

ObjectivesThe main objective of the study is to perform an analysis on the incidence, predictive variables, and severity of acute kidney injury (AKI) and its impact on the morbidity and mortality of patients in the Resuscitation and Special Care Unit (RSCU) of a regional hospital. MethodsA retrospective observational study was conducted that included all patients admitted from 1 January 2012 to 1 January 2015 (1,115 patients). The follow-up was until 15 July 2015. A descriptive statistical analysis of clinical-epidemiological and analytical variables was carried out. An analysis was then performed AKI in RSCU and mortality, as well as the agreement between the RIFLE (Risk, Injury, Failure, Loss of Kidney Function, and End-stage Kidney Disease)/AKIN (Acute Kidney Injury Network)/KDIGO (Kidney Disease: Improving Global Outcomes) criteria (kappa index). A multivariate logistic regression analysis was performed to select the variables associated with the presentation of AKI in RSCU and a univariate (Kaplan-Meier) and multivariate survival analysis (Cox regression). The statistical analysis was carried out using the statistical package SPSS 21. ResultsDuring admission to RSCU, 486 patients presented with AKI (43.6%), of which 21% were in stage I, 13.8% in stage II, and in stage III 8.7%. A high level of agreement was observed between the RIFLE/AKIN/KDIGO criteria. The variables that were related to the presence of AKI, are male (OR: 1.37; 95% CI: 1.02-2.30), to high Charlson comorbidity index (OR: 1.17; 95% CI: 1.09-1.26), carriers of chronic kidney disease (OR: 5.99; 95% CI: 4.58-8.18), admission due to surgery (OR: 1.69; 95% CI: 1.24-2.30), and shock (OR: 4.70; 95% CI: 3.34-6.61). The probability of survival during admission in RSCU decreases in patients with AKI (HR: 5.44; 95% CI: 1.70-17.39), and as the individual severity index of Liaño increases (HR: 10.29; 95% CI: 3.34-31.76). The probability of survival at the end of follow-up after hospital discharge decreases in patients with AKI (HR: 1.72; 95% CI: 1.14-2.61), as the individual severity index of Liaño increases (HR: 9,6; 95% CI: 5.07-18.20), the Charlson comorbidity index>6 (HR: 1.09; 95% CI: 1.03-1.15), low serum albumin<2.5mg/dL (HR: 1.69; 95% CI: 1.13-2.53), age by year>70 years (HR: 1.03; 95% CI: 1.01-1.04), males (HR: 1.38; 95% CI: 1.06-1.79) and carriers of previous chronic kidney disease (HR: 1.56; 95% CI: 1.02-2.38). ConclusionsThis study shows the presentation of an episode of AKI was an independent factor associated both with mortality during admission to RSCU, and later after hospital discharge. It is necessary to know the risk factors of this complication in order to adopt preventive measures.