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Background Few trials of acute kidney injury (AKI) prevention after surgery have been conducted and most observational studies focus on AKI following cardiac surgery. The frequency of, risk factors for, and outcomes after AKI following other types of major surgery have not been well characterized, and may present additional opportunities for trials in AKI. Study Design Observational cohort study. Setting & Participants 3.6 million US veterans followed up from 2004-2011 for the receipt of major surgery (cardiac; general; ear, nose, and throat [ENT], thoracic, vascular, urologic, orthopedic) and post-operative outcomes. Factors Demographics, health characteristics, and type of surgery. Outcomes Post-operative AKI defined by the KDIGO creatinine criteria, post-operative length of stay, end-stage renal disease (ESRD), and mortality. Results Post-operative AKI occurred in 11.8% of the 161,185 major surgery hospitalizations (stage 1, 76%; stage 2, 15%, stage 3 [without dialysis], 7%; AKI requiring dialysis, 2%). Cardiac surgery had the highest post-operative AKI risk (relative risk [RR], 1.22; 95% CI, 1.17-1.27), followed by general (reference), thoracic (RR, 0.92; 95% CI, 0.87-0.98), orthopedic (RR, 0.70; 95% CI, 0.67-0.73), vascular (RR, 0.68; 95% CI, 0.64-0.71), urologic (RR, 0.65; 95% CI, 0.61-0.69), and ENT (RR, 0.32; 95% CI, 0.28-0.37) surgery. Risk factors for post-operative AKI included older age, African-American race, hypertension, diabetes mellitus, and, when eGFR < 90 ml/min/1.73 m2, lower eGFR. Participants with post-operative AKI had longer length of stay (15.8 vs. 8.6 days) and higher rates of 30-day hospital readmission (21% vs. 13%), 1-year ESRD (0.94% vs. 0.05%) and mortality (19% vs. 8%), with similar associations by type of surgery and more severe stage of AKI relating to poorer outcomes. Limitations Urine output was not available to classify AKI; cohort included mostly men. Conclusions AKI was common after major surgery, with similar risk factor and outcome associations across surgery type. These results can inform the design of clinical trials in post-operative AKI to the non-cardiac surgery setting.

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Background An estimated 4 million Americans have been exposed to the hepatitis C virus (HCV) in the US population. The risk of incident and progressive chronic kidney disease and of mortality in patients with normal kidney function infected with HCV is unclear. Methods In a nationally representative cohort of 100,518 HCV+ and 920,531 HCV- US Veterans with normal baseline estimated glomerular filtration rate(eGFR), we examined the association of HCV infection with: (1)all-cause mortality, (2)incidence of decreased kidney function (defined as eGFR <60 ml/min/1.73m2 and 25% decrease in eGFR), (3)ESRD, and (4)rate of kidney function decline. Associations were examined in naïve and adjusted Cox models (for time-to-event analyses) and logistic regression models (for slopes), with sequential adjustments for important confounders. Propensity-matched cohort analysis was used in sensitivity analyses. Results The patients’ age was 54.5±13.1(mean±SD) years, 22% were black and 92% male, and the baseline eGFR was 88±16 ml/min/1.73m2. In multivariate adjusted models HCV infection was associated with 2.2 fold higher mortality (fully adjusted hazard ratio(aHR), 95%CI: 2.17(2.13–2.21)), 15% higher incidence of decreased kidney function(aHR, 95%CI: 1.15(1.12–1.17)), 22% higher risk of steeper slopes of eGFR (adjusted odds ratio, 95%CI: 1.22(1.19–1.26)) and 98% higher hazard of ESRD (aHR, 95%CI: 1.98 (1.81–2.16)). Quantitatively similar results were found in propensity-matched cohort analyses. Conclusions HCV infection is associated with higher mortality risk, incidence of decreased kidney function and progressive loss of kidney function. Randomized controlled trials are warranted to determine whether treatment of HCV infection can prevent the development and progression of CKD and improve patient outcomes.