Acute Kidney Injury Network Definition Research Articles

Predictive value of two different definitions of contrast-associated acute kidney injury for long-term major adverse kidney events in patients with ST-segment elevation myocardial infarction undergoing primary percutaneous coronary intervention.

It remains controversial whether contrast-associated acute kidney injury (CA-AKI) is associated with long-term major adverse kidney events (MAKE) in patients with ST-segment elevation myocardial infarction (STEMI) undergoing primary percutaneous coronary intervention (PCI). By the Acute Kidney Injury Network (AKIN) criteria, CA-AKI was defined as an increase in serum creatinine ≥ 0.3 mg/dL or 50% from baseline within 48 h after PCI; or an increase in serum creatinine ≥ 0.5 mg/dL or 25% within 72 h by the contrast-induced nephropathy (CIN) criteria. The primary endpoint was 1-year MAKE, defined as a composite of all-cause mortality and persistent renal dysfunction. A total of 402 patients were finally included in this study. The primary endpoint occurred in 29 (7.2%) patients. There was a significant association between CA-AKI and 1-year MAKE assessed by both the AKIN (hazard ratios [HR]: 11.58, 95% confidence interval [CI]: 4.29-31.24, p = 0.000) and CIN (HR: 6.45, 95% CI: 2.56-16.25, p = 0.000) definitions. However, the AKIN definition (HR: 4.95, 95% CI: 1.17-21.02, p = 0.030) was more reliable in the prediction of persistent renal dysfunction than CIN definition (HR: 4.08, 95% CI: 0.99-16.87, p = 0.052). Additionally, the area under receiver operating characteristic curve was larger for predicting 1-year MAKE with the AKIN definition than CIN definition (0.742 vs. 0.727). In patients with STEMI undergoing primary PCI, CA-AKI was significantly associated with 1-year MAKE. Moreover, the AKIN definition might be more reliable in the prediction of long-term prognosis.

Safety and Feasibility Assessment of a Pharmacy-Driven AUC/MIC Vancomycin Dosing Protocol in a Multicenter Hospital System.

Vancomycin is used for Gram-positive infections, including methicillin-resistant Staphylococcus aureus. The 2020 vancomycin guidelines described by M. J. Rybak, J. Le, T. P. Lodise, D. P. Levine, et al. (Am J Health Syst Pharm 77:835-864, 2020, https://doi.org/10.1093/ajhp/zxaa036) provided an update on vancomycin dosing, which recommended an optimal area under the concentration-time curve over 24 h to MIC (AUC/MIC) target of 400 to 600. In 2021, a pharmacy-driven AUC/MIC vancomycin dosing protocol was implemented across 12 Sentara Health System hospitals. The primary objective of this study was to assess if the pharmacy-driven AUC/MIC vancomycin dosing protocol led to fewer acute kidney injury (AKI) events than trough-based dosing. Secondary objectives included vancomycin duration, hospital length of stay, administered vancomycin dose during admission, vancomycin labs drawn during standard lab times, and cost. AKI was assessed in two separate ways: (i) modified AKIN (Acute Kidney Injury Network) criteria and (ii) a modified version from the vancomycin guidelines. Inferential statistics were used to analyze the results of this retrospective study. Per the AKIN definition, the rates of AKI were 13.9% (349/2,507) in the trough-based group and 14.9% (369/2,471) in the AUC/MIC-based group (P = 0.309). Per the definition of the vancomycin guidelines, the rates of AKI were 6.7% (169/2,507) in the trough-based group and 7.6% (187/2,471) in the AUC/MIC-based group (P = 0.258). A total of 52% (2,679/5,151) of vancomycin labs were obtained during standard lab times in the AUC group and 24% (1,144/4,766) in the trough group (P < 0.05). There was no difference in AKI events between AUC and trough dosing. Use of contrast dye may confound these results. AUC/MIC dosing was associated with more lab draws during standard times, a larger number of labs drawn per person, and less total use of vancomycin. IMPORTANCE In this article, we report that there were no differences in rates of acute kidney injury between trough-based vancomycin dosing and AUC/MIC-based vancomycin dosing across 12 hospitals. AUC/MIC dosing resulted in more vancomycin lab draws during standard lab draw times compared to trough dosing, thus making it more convenient for health care personnel. This study includes all uses for vancomycin, including empirical use, and all patient severity levels. Therefore, this research reflects real-world use of vancomycin in hospitals. AUC/MIC dosing is supported by various infectious disease societies. However, the feasibility of incorporating AUC/MIC dosing in hospitals is undetermined. This study is unique in that it includes hospitals of various sizes (small community hospitals and an academic teaching hospital), and it includes a feasibility component. Therefore, this study has broad applicability to other hospitals across the United States. This original research includes the clinical application of vancomycin in a multicenter health system.

A pattern-discovery-based outcome predictive tool integrated with clinical data repository: design and a case study on contrast related acute kidney injury

BackgroundClinical data repositories (CDR) including electronic health record (EHR) data have great potential for outcome prediction and risk modeling. We built a prediction tool integrated with CDR based on pattern discovery and demonstrated a case study on contrast related acute kidney injury (AKI).MethodsPatients undergoing cardiac catheterization from January 2015 to April 2017 were included. AKI was identified based on Acute Kidney Injury Network definition. Predictive model including 16 variables covered in existing AKI models was built. A visual analytics tool based on pattern discovery was trained on 70% data up to August 2016 with three interactive knowledge incorporation modes to develop 3 models: (1) pure data-driven, (2) domain knowledge, and (3) clinician-interactive, which were tested and compared on 30% consecutive cases dated afterwards.ResultsAmong 2560 patients in the final dataset, 189 (7.3%) had AKI. We measured 4 existing models, whose areas under curves (AUCs) of receiver operating characteristics curve for the test dataset were 0.70 (Mehran's), 0.72 (Chen's), 0.67 (Gao's) and 0.62 (AGEF), respectively. A pure data-driven machine learning method achieves AUC of 0.72 (Easy Ensemble). The AUCs of our 3 models are 0.77, 0.80, 0.82, respectively, with the last being top where physician knowledge is incorporated.ConclusionsWe developed a novel pattern-discovery-based outcome prediction tool integrated with CDR and purely using EHR data. On the case of predicting contrast related AKI, the tool showed user-friendliness by physicians, and demonstrated a competitive performance in comparison with the state-of-the-art models.

A Comparison of AKIN, KDIGO, and RIFLE Definitions to Diagnose Acute Kidney Injury and Predict the Outcomes after Cardiac Surgery in a South Asian Cohort

Background: Acute kidney injury (AKI) after cardiac surgery is associated with an increased mortality and morbidity. Different definitions for AKI have been used such as Acute Kidney Injury Network (AKIN), Kidney Disease: Improving Global Outcomes (KDIGO), or risk, injury, failure, loss, end-stage kidney disease (RIFLE). Each of these definitions has their own benefits and limitations for predicting the degree of AKI and adverse outcomes following cardiac surgery. This study was aimed to compare the three AKI definitions to diagnose AKI and their predictive ability for mortality and morbidity after isolated coronary artery bypass surgery (CABG) in a South Asian cohort. Material and Methods: A single-center retrospective review was conducted on 1,508 patients having undergone isolated CABG surgery from January 2015 to January 2019. AKI was assessed on three definitions, and comparative receiver operating characteristics curves were built against the outcomes to assess discriminative power of each. Results: Mean age of participants was 59.43 (±1.12) years, predominantly males (82.6%). Patients with AKI were elder, more likely to be diabetic and hypertensive. AKI by any definition occurred in 58.7% (885/1,508) patients. Frequency of AKI was 508 (33.7%), 517 (34.4%), and 871 (57.8%) on AKIN, KDIGO, and RIFLE criteria, respectively. The proportion of patients with RIFLE-risk 619 (41%) was greater compared with AKIN stage 1 (342 [22.7%]) and KDIGO stage 1 (330 [21.9%]), while for stages 2 and 3 the proportions were comparable across the three systems. Area under the curve (AUC) for 30-day mortality for AKIN was (0.786, [95% CI: 0.764–0.806]), KDIGO: (0.796, [95% CI: 0.775–0.816]) and for RIFLE (0.844, [95% CI: 0.825–0.862]). AUC for overall morbidity was in undesirable ranges (i.e., >0.5–≤0.7) for all three definitions. Conclusion: In a South Asian cohort, performance of AKIN and KDIGO criteria was comparable to diagnose AKI, while RIFLE definition, though overestimated the incidence of AKI particularly stage 1, and had an excellent discriminatory power to predict mortality compared to other two definitions.

A Comparison Between Two Definitions of Contrast-Associated Acute Kidney Injury for Long-Term Mortality in Elderly and Non-elderly Patients After Elective Percutaneous Coronary Intervention.

Background: Contrast-associated acute kidney injury (CA-AKI) is responsible for a substantial proportion of the observed mortality that occurs after percutaneous coronary intervention (PCI), particularly in elderly patients. However, there has been significant and debate over whether the optimal definition of CA-AKI persists over prolonged periods due to variations in the prevalence and effects on prognosis. In this study, we aimed to identify whether different definitions of CA-AKI exert differential impacts on long-term mortality when compared between elderly and non-elderly patients receiving elective PCI.Methods: We prospectively investigated 5,587 consenting patients undergoing elective PCI between January 2012 and December 2018. We considered two classical definitions of CA-AKI from the European Society of Urogenital Radiology (ESUR) and the Acute Kidney Injury Network (AKIN). Multivariable Cox regression analysis was used to investigate the association between CA-AKI and long-term mortality. We also performed interaction and stratified analyses according to age (≤75 or >75 years).Results: The incidence of CA-AKI according to the ESUR and AKIN definitions was 18.7 and 6.1%, respectively. After a median follow-up of 2.1 years, multivariable Cox regression analysis indicated that CA-AKI according to the AKIN definition was a risk factor for long-term mortality in the overall population [hazard ratio (HR) = 2.20; 95% confidential interval (CI): 1.51–3.22; p < 0.001]; however, this was not the case for the ESUR definition (HR = 1.27; 95% CI: 0.92–1.76; p = 0.153). Further interaction analysis identified a significant interaction between age and the ESUR definition (p = 0.040). Stratified analyses also found an association between the ESUR definition and long-term mortality in patients >75 years of age (p = 0.011), but not in patients ≤75 years of age (p = 0.657).Conclusion: As a stringent definition of CA-AKI, the AKIN definition was significantly associated with long-term mortality in both non-elderly and elderly patients. However, in elderly patients, the more lenient definition provided by the ESUR was also significantly correlated with long-term mortality, which could sensitively identify high-risk elderly patients and may provide a better alternative.

Abstract WP69: Computed Tomography Perfusion Imaging in Evaluation of Patients With Acute Stroke is Not Associated With Increased Risk of Acute Kidney Injury

Introduction: Mechanical thrombectomy has become standard of care in acute ischemic stroke with proximal arterial occlusion. For patients 6-24 hours from last known well, computed tomography perfusion (CTP) is now frequently used for assessment of endovascular therapy (EVT) eligibility. CTP requires an increased contrast load compared to computed tomographic angiography (CTA). Hypothesis: In patient assessment for EVT, CTA/CTP is not associated with higher incidence of acute kidney injury (AKI) compared to CTA alone. Methods: We reviewed data from consecutive acute stroke alerts at our institution from January-July 2018, and recorded baseline serum creatinine and creatinine at 24, 48, and 72 hours post-alert. AKI was defined by an increase in serum creatinine of 0.3, or more than a 1.5 fold increase in baseline creatinine, according to the Acute Kidney Injury Network definition. We compared patients receiving CTA/CTP versus CTA alone using independent samples t-test, including variables of age, NIHSS, baseline creatinine, and creatinine at 24, 48, and 72 hours. Chi-square testing was performed to compare incidence of AKI between groups. A binary logistic regression model was performed including covariates of age, sex, location of alert (emergency room or inpatient), NIHSS, baseline creatinine and imaging group. Significance was defined as p &lt; 0.05 for all tests. Results: Analysis included 285 patients: 210 receiving CTA alone, and 75 receiving CTA/CTP. Incidence of AKI was 4.7% in the CTA alone group versus 4% in the CTA/CTP group (χ2=0.74, p=0.786). The two groups did not differ with regard to age, NIHSS, or serum creatinine at any time point. In the binary logistic regression model, addition of CTP to CTA did not increase the odds ratio of developing AKI (OR 1.076 [95% CI 0.276-4.193]; p=0.916). Conclusions: In acute stroke assessment for EVT eligibility, the addition of CTP to CTA did not increase rates of AKI. While this retrospective analysis includes the possibility of selection bias, the two groups were similar in baseline characteristics including kidney function. These results provide Level II, Class B evidence supporting the safety of CTP in patient selection for EVT and may inform future AHA/ASA guidelines for management of acute ischemic stroke.

Validation of RIFLE, AKIN, and a modified AKIN definition ("backward classification") of acute kidney injury in a general ICU: Analysis of a 1-year period.

The aim of this study was to validate Acute Kidney Injury Network (AKIN) and to develop a modified AKIN aimed at an improved classification of patients without baseline creatinine versus Risk, Injury, Failure, Loss of kidney function, and End-stage kidney disease (RIFLE) in general intensive care unit (ICU) patients.We retrospectively analyzed medical records of general ICU patients over a 1-year period. We compared the grading of severity as well as the prediction of mortality and renal replacement therapy by AKIN and RIFLE. Furthermore, a modified AKIN score was evaluated.A total of 321 patients were included. In 87% of cases, the 2 definitions classified patients in the concordant severity group. Higher scores of AKIN and RIFLE were associated with increased ICU- and 28-day mortality. Both definitions provided large receiver operating characteristics (ROC)-area under the curve (AUCs) for the prediction of mortality, which were comparable to the ROC-AUC of unclassified serum creatinine. Modification of the AKIN score with a “backward classification” of baseline creatinine based on its time course resulted in a higher AKIN score in 32 patients.RIFLE and AKIN definitions had a high concordance in staging the severity of acute kidney injury. There was a strong relationship between the stages and need for dialysis, ICU, and 28-day mortality. However, unclassified serum creatinine values were at least comparable. Standardized observation of the creatinine time course allows for “ex-post” AKIN-classification in a substantial number of patients with missing baseline creatinine values.

MP42-05 ACUTE KIDNEY INJURY AND INTERMEDIATE-TERM RENAL FUNCTION AFTER CLAMPLESS PARTIAL NEPHRECTOMY

You have accessJournal of UrologyKidney Cancer: Localized: Surgical Therapy IV1 Apr 2018MP42-05 ACUTE KIDNEY INJURY AND INTERMEDIATE-TERM RENAL FUNCTION AFTER CLAMPLESS PARTIAL NEPHRECTOMY Minato Yokoyama, Naoko Kawamura, Sho Uehara, Yosuke Yasuda, Toshiki Kijima, Soichiro Yoshida, Junichiro Ishioka, Yoh Matsuoka, Kazutaka Saito, Kazunori Kihara, and Yasuhisa Fujii Minato YokoyamaMinato Yokoyama More articles by this author , Naoko KawamuraNaoko Kawamura More articles by this author , Sho UeharaSho Uehara More articles by this author , Yosuke YasudaYosuke Yasuda More articles by this author , Toshiki KijimaToshiki Kijima More articles by this author , Soichiro YoshidaSoichiro Yoshida More articles by this author , Junichiro IshiokaJunichiro Ishioka More articles by this author , Yoh MatsuokaYoh Matsuoka More articles by this author , Kazutaka SaitoKazutaka Saito More articles by this author , Kazunori KiharaKazunori Kihara More articles by this author , and Yasuhisa FujiiYasuhisa Fujii More articles by this author View All Author Informationhttps://doi.org/10.1016/j.juro.2018.02.1312AboutPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissionsReprints ShareFacebookTwitterLinked InEmail INTRODUCTION AND OBJECTIVES Some patients experience acute kidney injury (AKI) after partial nephrectomy (PN). The incidence of AKI after PN with hilar clamping has been reported in several studies, and some investigators demonstrated the association of duration or type of ischemia with the incidence of AKI. However, the incidence of AKI after clampless PN and the influence of AKI after PN on longitudinal change in postoperative renal function have not been fully explored. Here, we investigated associations between AKI and intermediate-term renal function after clampless PN. METHODS Between 2010 and 2015, 337 consecutive patients underwent gasless single-port PN and were followed up longer than 1 year. In this surgery, PN was done with an extraperitoneal approach via a single-port without gas insufflation and hilar clamping by using soft coagulation and ultrasonic coagulation system. Of the 337 patients, those with bilateral tumors (n=26), metastases (n=6), solitary kidney (n=4), and those requiring hilar clamping (n=21) were excluded. The association between the occurrence of AKI based on AKI network definition and renal impairment with ≥25% estimated glomerular filtration rate (eGFR) decrease was evaluated using Cox regression model.Then, mean eGFRs of the patients with or without AKI after clampless PN up to 5 years were plotted, and an annual change of eGFR from 1 year after surgery was calculated using linear mixed model. RESULTS Of the 280 patients, Median age, preoperative eGFR, tumor size, operation time, and blood loss was 58 years, 70.6 ml/min/1.73 m2, 2.5 cm, 214 minutes, and 314 ml, respectively. Hypertension, diabetes mellitus, dyslipidemia, and cardiovascular disease coexisted in 38%, 10%, 15%, and 9% of the subjects, respectively. AKI occurred in 21 patients (8%), and all the AKIs observed were grade 1. Median eGFR change at latest follow up (median 36 months) was -9.0%. During the follow up period, no patients required renal replacement therapy.Cox regression analysis showed that AKI was not associated with renal impairment after clampless PN, while advanced age (≥65) and presence of diabetes mellitus were independent risk factors.Annual eGFR changes from 1 year after clampless PN in patients with and without AKI were -0.34 (95% CI: -1.23 ~ 0.54) ml/min/1.73 m2 and -0.36 (-0.72 ~ -0.02) ml/min/1.73 m2, respectively. CONCLUSIONS Renal function was well preserved after clampless PN. The incidence and severity of AKI were low, and AKI after clampless PN was not associated with intermediate-term renal impairment. © 2018FiguresReferencesRelatedDetails Volume 199Issue 4SApril 2018Page: e537-e538 Advertisement Copyright & Permissions© 2018MetricsAuthor Information Minato Yokoyama More articles by this author Naoko Kawamura More articles by this author Sho Uehara More articles by this author Yosuke Yasuda More articles by this author Toshiki Kijima More articles by this author Soichiro Yoshida More articles by this author Junichiro Ishioka More articles by this author Yoh Matsuoka More articles by this author Kazutaka Saito More articles by this author Kazunori Kihara More articles by this author Yasuhisa Fujii More articles by this author Expand All Advertisement Advertisement PDF downloadLoading ...

Acute Kidney Injury in Neonatal Sepsis: Risk Factors, Clinical Profile, and Outcome

Objective This study aims to determine the proportion of cases of neonatal sepsis developing acute kidney injury (AKI). Methods This is a prospective observational study conducted in the nursery of a tertiary care center in Northern India during October 2012 to March 2014. Newborns with symptoms suggestive of sepsis were investigated. Those with congenital renal anomalies and negative for sepsis were excluded from the study. Newborns with sepsis were treated accordingly and observed for AKI until discharge or death. Acute Kidney Injury Network definition was used to define AKI in this study. Results A total of 310 neonates with sepsis were enrolled out of which 3.87% neonates developed AKI. Factors such as maternal age, sex, birth weight, gestational age, asphyxia, the risk factor of sepsis in the mother, meconium-stained liquor, and mode of delivery were not found to be associated with AKI. Meningitis (p &lt; 0.05) was found to be significantly associated with AKI. Duration of stay was longer for those with AKI (p &lt; 0.01), but the mortality rate did not differ significantly among those with AKI and those without AKI. Around 25% of cases were found to be AKI stage 1, 25% of cases were AKI stage 2, and 50% of cases were AKI stage 3. Conclusion It is difficult to predict AKI based on clinical features, so it is better to screen all the neonates with sepsis for AKI so that they can be managed accordingly, as AKI detected early has a better prognosis.

Impact of Higher Vancomycin Troughs on Vancomycin-Induced Nephrotoxicity

Background Guidelines published in 2009 by the Infectious Diseases Society of America, the American Society of Health-System Pharmacists, and the Society of Infectious Diseases Pharmacists recommended targeting vancomycin troughs of 15 to 20 mg/L. No previous studies exist examining the effect of implementing these guidelines on kidney function. The objective of this study was to evaluate the effect of a dosing nomogram that incorporated recommendations for higher vancomycin goal trough vancomycin-induced nephrotoxicity (VIN). Methods This study evaluated 300 adult inpatients with a pharmacokinetics consultation for vancomycin dosing. Two periods were evaluated: phase I (2008) assessed practice preguideline vancomycin dosing nomogram change, and phase II (2012) assessed practice postguideline vancomycin dosing nomogram change reflecting the higher trough targets. Groups were compared using χ2 or Fisher exact tests for categorical variables and Mann-Whitney U tests for continuous variables. The a priori level of significance was set at 0.05. Results A total of 300 inpatients (150 in 2008 and 150 in 2012) were included in the analysis. More patients from the 2012 group experienced VIN, according to the guideline definition (P = 0.03), but not per the 2007 Acute Kidney Injury Network definition (P = 0.88). There was no change in other adverse outcomes, including dialysis initiation (2 vs 0; P = 0.16), discharge on dialysis (1 vs 0; P = 0.32), transfer to another hospital for higher level of care (33 vs 34; P = 0.89), or death (15 vs 11; P = 0.41). Conclusions Targeting higher vancomycin troughs resulted in transient VIN but did not cause adverse sequelae.

Incidence of Early Acute Kidney Injury in Lung Transplant Patients: A Single-Center Experience

BackgroundAcute kidney injury (AKI) is a common complication in the early period of lung transplantation (LTx). We aimed to describe the incidence and perioperative risk factors associated with AKI following LTx. MethodsClinical data of 30 patients who underwent LTx were retrospectively reviewed. Primary outcomes were development of AKI and patient mortality within 30 postoperative days. Postoperative AKI is determined based on creatinine criteria from Acute Kidney Injury Network (AKIN) classification. Secondary outcomes included the association between AKI and demographic and clinical parameters of patients and treatment modalities in the pre- and postoperative periods. ResultsOf the 30 LTx recipients included, AKI occurred in 16 patients (53.4%) within the first 30 days. Length of intensive care unit (P = .06) and hospital stay (P = .008) and mechanical ventilation duration (P = .03) were significantly higher in patients with AKI compared with patients without AKI. Factors independently associated with AKI were intraoperative hypotension (odds ratio [OR] 0.500; 95% confidence interval [CI], 1.145 to 26.412, P = .02), longer duration of mechanical ventilation (OR 1.204; 95% CI 0.870 to 1.665, P = .03), and systemic infection (OR 8.067; 95% CI 1.538 to 42.318, P = .014) in the postoperative period. Short-term mortality was similar in patients with and patients without AKI. ConclusionBy the AKIN definition, AKI occurred in half of the patients following LTx. Several variables including intraoperative hypotension, longer duration of mechanical ventilation, and systemic infection in the postoperative period independently predict AKI in LTx recipients.

Clinical profile and outcome of acute kidney injury in neonatal sepsis in a tertiary care centre

Background: Septicemia remains a leading cause of morbidity and mortality among neonates with AKI complicating as many as 3.4 to 24% of them. The actual incidence of renal failure in all sepsis cases is not documented. There are several studies in the literature on renal failure in neonates which were based on older definitions using blood urea and urine output as parameters. The major limitation of the older studies was that they did not use the current acute kidney injury network (AKIN) definition. In the present study, we have attempted to investigate AKI in neonatal sepsis using the AKIN definition based on serum creatinine (Table1). We also attempted to determine the predictors of AKI in neonatal sepsis.Methods: The present study was an explorative study conducted in the neonatal unit of Cheluvamba hospital attached to Mysore Medical College and Research Institute in which a total of 50 neonates with clinical/ culture positive sepsis were enrolled during the period of June 2014 to June 2015.Results: These neonates were investigated for the presence of AKI based on serum creatinine values of three consecutive days and were divided into two groups. Group 1 consisted of septic neonates with AKI and group 2 consisted of septic neonates without AKI. Both the groups were followed up till discharge or death. The risk factors associated with sepsis were compared in both the groups and predictors of morbidity and mortality associated with AKI in sepsis were also determined.Conclusions: Incidence and mortality associated with AKI in sepsis was found to be 24% and 75% respectively. Factors like PROM, foul smelling liquor, &gt; 3 unclean vaginal examinations during labour were significant risk factors for development of AKI in sepsis. Culture positivity, associated meningitis, DIC, shock and need for assisted ventilation were poor prognostic indicators and were significantly associated with mortality.

Incidence and predictors of acute kidney injury in birth asphyxia in a Tertiary Care Hospital

Objective: The objective of this study is to estimate the incidence of acute kidney injury (AKI) in birth asphyxia and to find out the predictors of AKI in birth asphyxia in a tertiary care hospital. Materials and Methods: This is a cross-sectional study conducted in the neonatal intensive care unit of a tertiary care center in Northern India during November 2014– October 2015. Inborn babies admitted here with severe birth asphyxia were included in the study. The neonates were evaluated for the evidence of AKI and were grouped into two groups: Group I (all neonates with severe birth asphyxia as per the WHO definition and having evidence of AKI) and Group II (all neonates with severe birth asphyxia as per the WHO definition and without having evidence of AKI). Those with congenital renal anomalies were excluded from the study. The two groups were then compared. AKI network definition was used to define AKI. Results: The incidence of AKI in the present study was 44.21%. There was no significant difference in incidence between term and preterm neonates, and among various stages of hypoxic-ischemic encephalopathy. The majority (95%) had nonoliguric renal failure. Most (92.8%) of the cases recovered before discharge and the rest recovered at 1 month follow-up. Prolonged labor was found to be significantly associated with AKI. Patients with shock had more advanced stages of AKI compared to those without shock. Conclusion: From this study, it can be inferred that it is difficult to predict AKI based on clinical features such as oliguria or Apgar score, and it is better to screen all the birth asphyxia cases for AKI so that they can be detected early and managed accordingly. In addition, a single normal value of blood urea/serum creatinine cannot exclude AKI, and serial monitoring is important. Shock should be detected early and treated aggressively as shock was associated with advanced stages of AKI.

A comparison between two different definitions of contrast-induced acute kidney injury in patients with ST-segment elevation myocardial infarction undergoing primary percutaneous coronary intervention

BackgroundContrast-induced acute kidney injury (CI-AKI) is associated with significantly increased mortality after primary percutaneous coronary intervention (pPCI) for ST-segment elevation myocardial infarction (STEMI). The prognostic value of CI-AKI depends on the definitions used to define it. We compare the predictive accuracy of long-term mortality of two definitions of CI-AKI on consecutive patients undergoing pPCI for STEMI. MethodsIncidence, risk factors and long-term prognosis of CI-AKI were assessed according to two different definitions: the first as an increase in serum creatinine ≥25% or ≥0.5mg/dl from baseline within 72h after pPCI (contrast-induced nephropathy (CIN) criteria), the second one according to Acute Kidney Injury Network (AKIN) classification system. ResultsA total of 402 patients were enrolled. The median follow-up period was 12±4months. Long-term mortality rate was 9.5%. Independent predictors of long-term mortality were: older age, basal renal impairment, left ventricular ejection fraction <40%, in-hospital major bleedings and CI-AKI. A significant correlation was found between mortality and CI-AKI as assessed by both CIN (HR 4.84, 95% CI: 2.56–9.16, p=0.000) and AKIN (HR 9.70, 95% CI: 5.12–18.37, p=0.000) definitions. The area under the receiver operating curve was significantly larger for predicting mortality with AKIN classification than with CIN criteria (0.7984 versus 0.7759; p=0.0331). ConclusionsIn patients with STEMI treated by pPCI, CI-AKI is a frequent complication irrespective of the criteria used for its definition. AKIN, however, seems to provide a better accuracy in predicting long-term mortality than CIN criteria.

Acute kidney injury in critically ill patients with haematological malignancies: results of a multicentre cohort study from the Groupe de Recherche en Réanimation Respiratoire en Onco-Hématologie

Cancer patients are at high risk for acute kidney injury (AKI), which is associated with high morbidity and mortality. We sought to appraise the incidence, risk factors, and outcome of AKI in a large multicentre cohort study of critically ill patients with haematological malignancies. We used a retrospective analysis of a prospectively collected database. The study was carried out in 17 university or university-affiliated centres in France and Belgium between 2010 and 2012. AKI was defined according to the Acute Kidney Injury Network (AKIN) definition. Of the 1011 patients admitted into the intensive care unit (ICU) during the study period, 1009 were included in this study. According to the AKIN definition, 671 patients (66.5%) developed an AKI during their ICU stay, of which 258 patients (38.4%) were AKI stage 1, 75 patients (11.2%) AKI stage 2 and 338 patients (50.4%) AKI stage 3. After adjustment for confounders, main adverse risk factors of AKI were older age, severity [non-renal Sequential Organ Failure Assessment (SOFA)], history of hypertension, tumour lysis syndrome, exposure to nephrotoxic agents and myeloma. Hospital mortality was 44.3% in patients with AKI and 25.4% in patients without AKI (P < 0.0001). After adjustment for confounders, AKI was independently associated with hospital mortality [OR 1.65 (95% CI 1.19-2.29)]. Overall, 271 patients required renal replacement therapy (RRT), of whom 57.2% died during their hospital stay as compared with 31.2% (P < 0.0001) in those not requiring RRT. Two-thirds of critically ill patients with haematological malignancies developed AKI. Hospital mortality in this population of patients developing AKI or requiring RRT is close to that in general ICU population.

Russells Viper Envenomation-associated Acute Kidney Injury in Children in Southern India.

To determine the frequency and risk factors of acute kidney injury in children with Russells viper envenomation using Acute Kidney Injury Network definition and classification system. A prospective observational study recruiting 61 subjects managed as per the National Snakebite Protocol. 45.9% of envenomed children had acute kidney injury. The median (IQR) of the maximum serum creatinine level during hospitalization was 2 (1.3-4.8) mg/dL. The distribution of stages 1, 2 and 3 of acute kidney injury was 32.1%, 17.9% and 50% respectively. Dialysis was required in 35.7% of the children with acute kidney injury. Acute kidney injury is common with Russells viper envenomation. Native treatments and bleeding manifestations were associated with acute kidney injury in our patient population.

Preoperative serum h-FABP concentration is associated with postoperative incidence of acute kidney injury in patients undergoing cardiac surgery.

BackgroundFatty acid binding protein (FABP) is an intracellular transport protein associated with myocardial damage size in patients undergoing cardiac surgery. Furthermore, elevated FABP serum concentrations are related to a number of common comorbidities, such as heart failure, chronic kidney disease, diabetes mellitus, and metabolic syndrome, which represent important risk factors for postoperative acute kidney injury (AKI). Data are lacking on the association between preoperative FABP serum level and postoperative incidence of AKI.MethodsThis prospective cohort study investigated the association between preoperative h-FABP serum concentrations and postoperative incidence of AKI, hospitalization time and length of ICU treatment. Blood samples were collected according to a predefined schedule. The AKI Network definition of AKI was used as primary endpoint. All associations were analysed using descriptive and univariate analyses.ResultsBetween 05/2009 and 09/2009, 70 patients undergoing cardiac surgery were investigated. AKI was observed in 45 patients (64%). Preoperative median (IQR) h-FABP differed between the AKI group (2.9 [1.7–4.1] ng/ml) and patients without AKI (1.7 [1.1–3.3] ng/ml; p = 0.04), respectively. Patients with AKI were significantly older. No statistically significant differences were found for gender, type of surgery, operation duration, CPB-, or X-Clamp time, preoperative cardiac enzymes, HbA1c, or CRP between the two groups. Preoperative h-FABP was also correlated with the length of ICU stay (rs = 0.32, p = 0.007).ConclusionsWe found a correlation between preoperative serum h-FABP and the postoperative incidence of AKI. Our results suggest a potential role for h-FABP as a biomarker for AKI in cardiac surgery.

Incidence, Outcomes, and Comparisons across Definitions of AKI in Hospitalized Individuals

At least four definitions of AKI have recently been proposed. This study sought to characterize the epidemiology of AKI according to the most recent consensus definition proposed by the Kidney Disease Improving Global Outcomes (KDIGO) Work Group, and to compare it with three other definitions. This was a retrospective cohort study of 31,970 hospitalizations at an academic medical center in 2010. AKI was defined and staged according to KDIGO criteria, the Acute Dialysis Quality Initiative's RIFLE criteria, the Acute Kidney Injury Network (AKIN) criteria, and a definition based on a model of creatinine kinetics (CK). Outcomes of interest were incidence, in-hospital mortality, length of stay, costs, readmission rates, and posthospitalization disposition. AKI incidence was highest according to the KDIGO definition (18.3%) followed by the AKIN (16.6%), RIFLE (16.1%), and CK (7.0%) definitions. AKI incidence appeared markedly higher in those with low baseline serum creatinine according to the KDIGO, AKIN, and RIFLE definitions, in which AKI may be defined by a 50% increase over baseline. AKI according to all definitions was associated with a significantly higher risk of death and higher resource utilization. The adjusted odds ratios for in-hospital mortality in those with AKI were highest with the CK definition (5.2; 95% confidence interval [95% CI], 4.1 to 6.6), followed by the RIFLE (2.9; 95% CI, 2.2 to 3.6), KDIGO (2.8; 95% CI, 2.2 to 3.6), and AKIN (2.6; 95% CI, 2.0 to 3.3) definitions. Concordance in diagnosis and staging was high among the KDIGO, AKIN, and RIFLE definitions. The incidence of AKI in hospitalized individuals varies depending on the definition used. AKI according to all definitions is associated with higher in-hospital mortality and resource utilization. AKI may be inappropriately diagnosed in those with low baseline serum creatinine using definitions that incorporate percentage increases over baseline.

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Impact of Perioperative Acute Kidney Injury as a Severity Index for Thirty-Day Readmission After Cardiac Surgery

Of patients undergoing cardiac surgery in the United States, 15% to 20% are re-hospitalized within 30 days. Current models to predict readmission have not evaluated the association between severity of postoperative acute kidney injury (AKI) and 30-day readmissions. We collected data from 2,209 consecutive patients who underwent either coronary artery bypass or valve surgery at 7 member hospitals of the Northern New England Cardiovascular Disease Study Group Cardiac Surgery Registry between July 2008 and December 2010. Administrative data at each hospital were searched to identify all patients readmitted to the index hospital within 30 days of discharge. We defined AKI stages by the AKI Network definition of 0.3 or 50% increase (stage 1), twofold increase (stage 2), and a threefold or 0.5 increase if the baseline serum creatinine was at least 4.0 (mg/dL) or new dialysis (stage 3). We evaluate the association between stages of AKI and 30-day readmission using multivariate logistic regression. There were 260 patients readmitted within 30 days (12.1%). The median time to readmission was 9 (interquartile range, 4 to 16) days. Patients not developing AKI after cardiac surgery had a 30-day readmission rate of 9.3% compared with patients developing AKI stage 1 (16.1%), AKI stage 2 (21.8%), and AKI stage 3 (28.6%, p < 0.001). Adjusted odds ratios for AKI stage 1 (1.81; 1.35, 2.44), stage 2 (2.39; 1.38, 4.14), and stage 3 (3.47; 1.85 to 6.50). Models to predict readmission were significantly improved with the addition of AKI stage (c-statistic 0.65, p = 0.001) and net reclassification rate of 14.6% (95% confidence interval: 5.05% to 24.14%, p = 0.003). In addition to more traditional patient characteristics, the severity of postoperative AKI should be used when assessing a patient's risk for readmission.