Long-term Renal Function In Patients Research Articles

The impact of SARS-CoV-2 infection on renal function in patients with biopsy-proven kidney diseases.

We sought to evaluate the long-term effects of COVID-19 on renal function in patients with biopsy-proven kidney diseases. A total of 451 patients with biopsy-proven kidney disease and at least 12 months of follow-up subsequent to COVID-19 pandemic onset were included in the study. The primary study endpoint was a composite of a persistent decline of more than 30% in eGFR or ESRD. 23.1% of patients had COVID-19 during a follow-up period of 2.5 y (0.8-2.6), while 17.6% of patients reached the composite endpoint. Those with COVID-19 were more likely to reach the composite endpoint [26.7% vs. 14.8%; OR, 2.1 (95%CI, 1.23-3.58), p = 0.006). There was a significant eGFR change in the first year of follow-up between the two study groups [-2.24 (95%CI,-4.86; 0.37) vs. +2.31 (95%CI, 0.78; 3.85) ml/min, p = 0.004], with an adjusted mean difference of -4.68 ml/min (95%CI,-7.7; -1.59)(p = 0.03). The trend for worse renal outcomes remained consistent in patients with IgAN, MN and FSGS, but not in those with LN. After multivariate adjustment, the independent predictors of the composite endpoint were baseline eGFR (HR, 0.94; 95%CI, 0.92-0.95), COVID-19 (HR, 1.91; 1.16-3.12) and male gender (HR, 1.64; 95%CI, 1.01-2.66). In multivariate linear regression analysis, COVID-19 independently determined a reduction of eGFR at 12 months by 4.62 ml/min/1.73m2 (β coefficient, -4.62; 95%CI, -7.74 to -1.5, p = 0.004). There is a significant impact of COVID-19 on long-term renal function in patients with biopsy-proven kidney diseases, leading to a greater decline of eGFR and a worse renal survival.

Harmful effect of repetitive intravenous iodinated contrast media administration on the long-term renal function of patients with early gastric cancer

This retrospective study investigated whether repetitive exposure to intravenous iodinated contrast media (ICM) affects long-term renal function in patients who undergo curative surgery for early gastric cancer (EGC) collected from the Korean Health Insurance and Review Assessment (HIRA) database. Patients diagnosed with gastric cancer between January 2010 and December 2013 underwent regular computed tomography (CT) scans to monitor for extragastric recurrence. Patients who already had chronic kidney disease (CKD) before cancer diagnosis or had undergone chemotherapy or repeated surgery were excluded. A nested case–control study design was chosen to analyze the effect of repetitive ICM exposure to long-term renal function by comparing patients who developed CKD 2 years after cancer diagnosis and patients who did not. Among 59,971 patients collected according to inclusion and exclusion criteria, 1021 were diagnosed with CKD 2 years after cancer diagnosis. Using 1:5 matching after adjusting for age, sex and date of cancer diagnosis, 5097 control patients were matched to 1021 CKD patients. Conditional logistic regression showed that the number of CTs taken using ICM slightly increased the odds of CKD (odds ratio, 1.080; 95% confidence interval (CI): 1.059, 1.100; P < 0.0001). Thus, the administration of ICM might contribute to chronic renal function impairment.

Renin Inhibition and the Long-Term Renal Function in Patients With Hypertensive Emergency: A Retrospective Cohort Study.

The rehospitalization rate in a hypertensive emergency is high, indicating the necessity for optimizing its long-term management. The role of the renin-angiotensin system (RAS) blockade in this disorder remains uncertain. We conducted a retrospective analysis involving 20 admitted patients who received aliskiren, a direct renin inhibitor (DRI), for the management of hypertensive emergency associated with elevated plasma renin activity (PRA). We analyzed the changes in blood pressure (BP), kidney function, and RAS activity in the subacute and chronic phases. The use of DRI was associated with a marked reduction in PRA (median, from 25.0 to 1.2 ng/ml/h) and serum aldosterone levels (from 404 to 130 pg/ml) during the index admission. BP also decreased from 226/143 to 142/80 mm Hg. A comparison of clinical characteristics according to the renal function indicated that dialysis-dependent patients had higher aldosterone levels than non-dialysis-dependent patients at admission, despite comparable BP levels. After a median follow-up of 567 days in non-dialysis-dependent patients with DRI, eGFR levels were significantly increased from 14.3 to 23.1 ml/min/1.73 m2. PRA levels were consistently suppressed at 0.8 ng/ml/h. We found a significant correlation between the degree of PRA suppression and changes in eGFR (r = -0.58), indicating that the effective blockade of RAS is associated with the preservation of eGFR in the study subjects. DRI can successfully suppress PRA in patients with high-renin hypertensive emergency in both subacute and chronic phases. An efficient RAS blockade is associated with preserved renal function in these patients.

#2955 THE IMPACT OF SARS-COV-2 INFECTION ON LONG-TERM RENAL FUNCTION IN PATIENTS WITH GLOMERULAR DISEASES

Abstract Background and Aims We sought to evaluate the long-term effects of SARS-CoV-2 infection on renal function in patients with glomerular diseases. Method A total of 451 patients with biopsy-proven glomerular disease and at least 12 months of follow-up after COVID-19 pandemic onset were included in the study. A SARS-CoV-2 infection was diagnosed based on a positive RT-PCR and/or antigen test. Multivariate Cox proportional hazards regression analysis was performed to identify the independent predictors of a composite endpoint (≥30% decline in eGFR, ESRD). In addition, a multivariate linear regression analysis was developed to identify the impact of SARS-CoV-2 infection on eGFR decline at 12 months after pandemic onset. Results Since 26th February 2020, when the first case of SARS-CoV-2 infection was diagnosed in Romania, 23.1% of patients had a SARS-CoV-2 infection during a follow-up period of 2.5 y (0.8-2.6). The most frequent glomerular disease was IgA nephropathy (22.6%), followed by lupus nephritis (11.5%) and membranous nephropathy (9.5%). 71.8% of the study cohort received various regimens of immunosuppression. Patients with SARS-CoV-2 infection were younger and more likely to have received immunosuppressive therapy compared to patients without infection, but the renal function at baseline was similar between the study groups (eGFR, 52±31.2 vs 52.1±29.3 ml/min, respectively; p = 0.78). 17.6% of patients reached the composite endpoint, while 12.3% progressed to ESRD. Those with SARS-CoV-2 infection were more likely to reach the composite endpoint compared to those without infection [prevalence of composite endpoint, 26.7% vs. 14.8%, p = 0.006; OR, 2.1 (95%CI, 1.23-3.58), p = 0.006) (Figure 1). Similarly, there was a significant decline of eGFR in the first year of follow-up between the two study groups [-2.24 (-24.8; 20.9) vs. +2.31 (-16.8; 27.5) ml/min, respectively, p = 0.004]. In multivariate Cox proportional hazards regression analysis, the independent predictors of the composite endpoint were baseline eGFR (HR, 0.94; 95%CI, 0.92-0.95, p&amp;lt;0.001), the occurrence of SARS-CoV-2 infection (HR, 1.91; 1.16-3.12, p = 0.01) and male gender (HR, 1.64; 95%CI, 1.01-2.66, p = 0.04). When taking into account the severity of SARS-CoV-2 infection, a severe infection was the most important predictor of the composite endpoint (HR, 2.1; 95%CI, 1.02-4.29, p = 0.04) (Figure 2). The results remained consistent when restricting the analysis to ESRD as an endpoint. When taking into account the eGFR slope at 12 months after COVID-19 pandemic onset as the outcome variable in multivariate linear regression analysis, the SARS-CoV-2 infection occurrence independently determined a reduction of eGFR by 4.62 ml/min/1.73m2 (β coefficient, -4.62; 95%CI, -7.74 to -1.5, p = 0.004). Conclusion There is a significant impact of SARS-CoV-2 infection on long-term renal function in patients with glomerular diseases, while those with severe infection had a greater decline of eGFR and a worse renal survival.

Long-term renal function in patients undergoing surgical reconstruction for tubercular cicatrized bladder.

We evaluated the long-term renal function in patients after surgical reconstruction for tuberculous contracted bladder (TBC) and determined factors associated with decreased renal function (RF) during follow up. We reviewed the records of 61 patients who underwent augmentation cystoplasty (AC) or orthotopic neobladder (ONB) for TBC between June 1994 and August 2019 in our institute. The estimated glomerular filtration rate (eGFR) was calculated preoperatively at initial presentation, before augmentation and at various intervals during follow up. Renal function decrease was defined as a defined as new-onset stage-3A Chronic kidney disease(CKD) or upstaging of pre-operative CKD stage 3A in follow-up. Multivariable analysis was done to evaluate the association of clinicopathological features and postoperative complications with decreased renal function. We analyzed 39 patients who had a minimum follow-up of 1-year post reconstruction. At a median follow-up of 52months (IQR 31-103months), 16/39 patients developed RF decrease. In univariate analyses, initial eGFR, and associated ureteric stricture in contralateral renal unit were significantly associated with new-onset renal insufficiency (p < 0.001 each). On multivariable analysis, only initial presenting eGFR (p < 0.001) was an independent predictor of new-onset renal insufficiency. ROC cut-off levels for eGFR at presentation predicting the primary end point of RF decrease was 45ml/min. Decreased renal function is noted in most patients during long term follow-up after surgical reconstruction for TBC. After controlling for preoperative and postoperative risk factors, patients with initial presenting GFR < 45ml/min are at greater risk of a decline in renal function following reconstruction.

Nadir creatinine as a predictor of renal outcomes in PUVs: A systematic review and meta-analysis.

Posterior urethral valves (PUVs) represent the most severe pediatric obstructive uropathy, responsible for chronic renal failure in up to 65% of cases and progression to end-stage kidney disease (ESKD) in about 8%-21% of patients. Unfortunately, renal outcomes have poorly improved over time. The key point is to identify patients at risk; thus, several prenatal and postnatal prognostic factors have been analyzed to improve clinical outcomes. Postnatal nadir creatinine seems to accurately predict long-term renal prognosis, but there is no definitive evidence to support this finding. We performed a systematic review with meta-analysis to analyze the predictive value of nadir creatinine on long-term renal function in infants with PUVs. We conducted this systematic review according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. PubMed and Cochrane Library were systematically searched for studies published from January 2008 to June 2022. All the articles were checked independently by two reviewers in two steps. A total of 24 articles were screened, and 13 were included for data extraction. Data from 1,731 patients with PUVs were analyzed, with a mean follow-up of 5.5 years; of these, on average, 37.9% developed chronic kidney disease (CKD) and 13.6% developed ESKD. All the articles evaluated nadir creatinine as a predictor of CKD, most using a level of 1 mg/dL, with statistical significance at the 5% level. The relative risk of developing CKD in patients with creatinine values higher than the nadir cutoff considered was 7.69 (95% CI: 2.35-25.17, I 2 = 92.20%, p < 0.001). Nadir creatinine is the best prognostic factor for long-term renal function in patients affected by PUV. A value above the cutoff of 1 mg/dL should be considered a significant predictor for the risk of CKD and ESKD. Further studies are needed to define different nadir creatinine cutoffs for better stratification of the different CKD stages and for the development of reliable scores, which include the association of several variables.

Long-term renal function in patients with chronic kidney disease following radical cystectomy and orthotopic neobladder.

To evaluate long-term renal function in patients with chronic kidney disease (CKD) Stage IIIa who underwent radical cystectomy and orthotopic neobladder (RC/ONB) compared to matched controls. Using our Institutional Review Board-approved institutional database, patients with a glomerular filtration rate (GFR) of 45-59.9 mL/min/1.73 m2 who underwent RC/ONB were identified. A control group of patients with a GFR of ≥60 mL/min/1.73 m2 was selected. Groups were matched based on age, baseline hypertension/diabetes mellitus, perioperative chemotherapy, and preoperative hydronephrosis. A decrease in GFR of >10 mL/min/1.73 m2 during the follow-up was considered significant. A multivariate Cox regression analysis was performed to identify predictors of GFR decline in each group. Of 1237 patients who underwent RC/ONB, 508 patients were included (254 per group). The mean preoperative GFR was 53.3 mL/min/1.73 m2 in the study group and 78.8 mL/min/1.73 m2 in controls. The median follow-up was 3.7 years. During follow-up, GFR stayed at or above baseline in 51% of the study patients compared to 46% of the controls (P = 0.5). The mean time to a significant GFR decline in the study patients was significantly longer compared to the controls (5.6 vs 2 years, respectively; P < 0.001). In multivariate analysis, neoadjuvant chemotherapy was found to be the strongest predictor of a significant GFR decline as well as GFR decline below baseline (hazard ratio [HR] 2.15, 95% confidence interval [CI] 1.4-3.29, P = 0.004; and HR 2.15, 95% CI 1.4-3.29, P < 0.001, respectively). Patients with CKD Stage IIIa who undergo ONB appear to have comparable long-term renal function to those with a GFR of ≥60 mL/min/1.73 m2 . An ONB reconstruction is a safe option for patients with CKD Stage IIIa desiring a continent diversion.

Long-Term renal function after implantation of continuous-flow left ventricular assist devices: A single center study.

BackgroundImplantable continuous-flow left ventricular assist device (LVAD) improve renal function in advanced heart failure. However, the long-term effects of LVAD on renal function have not been investigated thoroughly. We aimed to assess long-term renal function in patients with LVAD support and to identify predictors for late deterioration in renal function (LDRF).MethodsOne hundred patients underwent LVAD implantation as a bridge to transplant at the University of Tokyo Hospital between May 2011 and December 2018. We assessed renal function at intervals (preoperative, 1, 6, 12, 18, 24 and 30 months after LVAD implantation). We divided patients into two groups: “with LDRF,” whose renal function at 30 months had decreased by >25% compared with preoperatively (n = 14), and “without LDRF” (n = 55).ResultsRenal function improved at 1 month, returned to preoperative levels at 6 months, and remained there up to 30 months after LVAD implantation. However, renal function impairment became evident in patients with LDRF 18 months after LVAD implantation. A ratio of right atrial pressure/pulmonary artery wedge pressure > 0.57 and left ventricular dimension diastole ≤ 67 mm were preoperative independent risk factors for LDRF. In addition, the incidence of perioperative acute kidney injury, ventricular arrhythmia, aortic insufficiency, and late right ventricular failure was significantly higher in patients with LDRF.ConclusionLDRF after LVAD implantation corresponded to several risk factors, including a small left ventricle and LVAD-related complications, such as right ventricular failure.

Is There a Place for Induction Therapy With Polyclonal Antibodies to Improve Renal Function After Liver Transplantation?

Is There a Place for Induction Therapy With Polyclonal Antibodies to Improve Renal Function After Liver Transplantation?

Acute Kidney Injury Adjusted for Parenchymal Mass Reduction and Long-Term Renal Function after Partial Nephrectomy.

We sought to evaluate the association of postoperative acute kidney injury (AKI) adjusted for parenchymal mass reduction with long-term renal function in patients undergoing partial nephrectomy. A total of 629 patients undergoing partial nephrectomy were reviewed. Postoperative AKI was defined by the Kidney Disease: Improving Global Outcomes (KDIGO) serum creatinine criteria, by using either the unadjusted or adjusted baseline serum creatinine level, accounting for renal parenchymal mass reduction. Estimated glomerular filtration rates (eGFRs) were followed up to 61 months (median 28 months) after surgery. The primary outcome was the functional change ratio (FCR) of eGFR calculated by the ratio of the most recent follow-up value, at least 24 months after surgery, to eGFR at 3–12 months after surgery. Multivariable linear regression analysis was performed to evaluate whether unadjusted or adjusted AKI was an independent predictor of FCR. As a sensitivity analysis, functional recovery at 3–12 months after surgery compared to the preoperative baseline was analyzed. Median parenchymal mass reduction was 11%. Unadjusted AKI occurred in 16.5% (104/625) and adjusted AKI occurred in 8.6% (54/629). AKI using adjusted baseline creatinine was significantly associated with a long-term FCR (β = −0.129 ± 0.026, p < 0.001), while unadjusted AKI was not. Adjusted AKI was also a significant predictor of functional recovery (β = −0.243 ± 0.106, p = 0.023), while unadjusted AKI was not. AKI adjusted for the parenchymal mass reduction was significantly associated with a long-term functional decline after partial nephrectomy. A creatinine increase due to remaining parenchymal ischemic injury may be important in order to predict long-term renal functional outcomes after partial nephrectomy.

P-173 - Impact of proteinuria on long-term renal function in patients with gastrointestinal cancer treated with ramucirumab

P-173 - Impact of proteinuria on long-term renal function in patients with gastrointestinal cancer treated with ramucirumab

Phase III Trial of Intravenous Mannitol Versus Placebo During Nephron-sparing Surgery: Post Hoc Analysis of 3-yr Outcomes

Our recently reported phase III trial demonstrated that patients undergoing nephron-sparing surgery (NSS) with an estimated glomerular filtration rate (eGFR) of ≥45 ml/min/1.73 m2 who received mannitol had no improvement in renal function at 6 mo compared with those who received placebo. Some authors have suggested that benefit is restricted to subgroups, such as those with comorbidities. We assessed whether preoperative eGFR, or other patient and surgical factors modified the effect of mannitol on postoperative outcomes at 6 mo and with extended follow-up. We also assessed whether mannitol was associated with differences in long-term GFR years after surgery. No significant difference between the mannitol or placebo groups (mean eGFR difference: 1.4; 95% confidence interval: –2.6, 5.3; p = 0.5) was found in the 134 patients with known eGFR at 3 yr after NSS. At both 6 mo and 3 yr, the effect of mannitol was not significantly modified by patient or surgical factors including preoperative eGFR. In summary, we validated our original trial conclusions by finding that intraoperative use of mannitol does not improve either short- or long-term renal function in patients undergoing NSS. Specifically, there is no evidence that comorbidities, including lower preoperative eGFR, modify the effect of mannitol. Patient summaryUse of mannitol at the time of partial nephrectomy does not improve either short- or long-term renal function even in patients with comorbidities, including lower preoperative renal function. The routine use of intraoperative mannitol should be discontinued.

Renal implications of pulmonary arterial capacitance in acute heart failure with preserved ejection fraction.

Worsening renal function in patients with heart failure with preserved ejection fraction is associated with poor outcomes. Pulmonary arterial capacitance is a novel right heart catheterization derived hemodynamic metric representing pulmonary arterial tree distensibility and right ventricle afterload. Given the strong association between heart failure, pulmonary hypertension, and kidney function, the goal of this study is to investigate the correlation between Pulmonary arterial capacitance and long-term renal function in patients with heart failure with preserved ejection fraction. In this retrospective single center study, data from 951 patients with the diagnosis of heart failure, who underwent right heart catheterization were analyzed. Eight hundred and one patients with reduced ejection fraction, end-stage kidney disease on hemodialysis, acute myocardial infarction, and severe structural valvular disorders, were excluded. Pulmonary arterial capacitance was calculated as the stroke volume divided by pulmonary artery pulse pressure (mL/mmHg). Hemodynamic and clinical variables including baseline renal function were obtained at the time of the right heart catheterization, and renal function was also obtained at 3-5 years after right heart catheterization. The final cohort consisted of 150 subjects with a mean age 68 ( ± 14.2) years, 93 (62%) were female. The mean value for Pulmonary arterial capacitance was 2.82 ( ± 2.22) mL/mm Hg and the mean Glomerular Filtration Rate was 60.32 mL/min/l.73 m² ( ± 28.36). After multivariate linear regression analysis (including baseline Estimated Glomerular Filtration Rate as one of the variates), only age and Pulmonary arterial capacitance greater than 2.22 mL/mm Hg were predictors of long term Glomerular Filtration Rate. Pulmonary arterial capacitance as a novel right heart catheterization index could be a predictor of long-term renal function in patients with heart failure with preserved ejection fraction.

Comprehensive renal function evaluation in patients treated for synchronous bilateral Wilms tumor

ObjectivesThe purpose of this study was to perform a comprehensive assessment of long-term renal function in patients treated at our institution for synchronous bilateral Wilms tumor (BWT) and to determine the optimal method for estimating glomerular filtration rate (eGFR). MethodsSurgical approach, adjuvant therapy, and pathology reports were reviewed for patients with at least six months follow-up from definitive surgery. eGFRs, as assessed by the Schwartz and Chronic Kidney Disease in Children (CKiD) formulas, were compared to measured GFR (mGFR) determined by 99mTc-DTPA scanning. Urine studies, including microalbumin, β-microglobulin, and FENa were also reviewed. ResultsForty-two patients were identified. Of 36 living patients, 28 (77.8%) had greater than 6months follow-up, with a median overall follow-up of 5.2years (range: 1.4–13.4). The median mGFR was 97mL/min/1.73m2, while the median eGFRSchwartz and eGFRCKiD were 103.3mL/min/1.73m2 and 79.7mL/min/1.73m2, respectively, (p=0.13 and p=0.75, compared to mGFR). Eleven (39.3%) patients had at least one abnormal urine study (microalbumin >30μg/g creatinine, n=3; β-2 microglobulin >133μg/g creatinine, n=9; FENa>1%, n=4). ConclusionsIn our series, few patients had an abnormally low GFR. Neither method for estimating GFR gave a significantly different result from measured GFR, suggesting that the Schwartz equation is adequate, although specific urine tests may be more sensitive for detecting subtle renal dysfunction. Level of evidenceLevel IV — retrospective case series with no comparison group.

Biphasic decline in renal function after radical cystectomy with urinary diversion.

We evaluated short- and long-term renal function in patients after radical cystectomy with urinary diversion and identified risk factors for the deterioration of renal function. This retrospective study comprised 91 patients who underwent radical cystectomy and urinary diversion for bladder cancer and survived ≥3years after surgery. The estimated glomerular filtration rate (eGFR) was calculated, and longitudinal changes of eGFR were assessed. Deterioration in renal function in early and late postoperative years was defined as a ≥25% decrease in the eGFR from preoperative to postoperative year one, and a reduction in the eGFR of >1mL/min/1.73m2 annually in subsequent years, respectively. Univariate and multivariate logistic regression analyses were used to evaluate its association with clinicopathologic features. The median follow-up period after surgery was 7years (range 3-26). The mean eGFR decreased from preoperative 65.1 to 58.9mL/min/1.73m2 1year after the surgery, followed by a continuous decline of ~1.0mL/min/1.73m2 per year thereafter. Multivariate analyses identified ureteroenteric stricture as the sole risk factor associated with early renal function deterioration [odds ratio (OR) 4.22, p=0.037]. Diabetes mellitus (OR 8.24, p=0.015) and episodes of pyelonephritis (OR 4.89, p=0.038) were independently associated with the gradual decline in the late postoperative period. In cystectomy patients with urinary diversion, the rapid deterioration of renal function observed during the first year after surgery and the gradual but continuous decline in function thereafter were found to be associated with different risk factors.

Repeated cycles of high-dose intravenous immunoglobulin and plasmapheresis for treatment of late antibody-mediated rejection of renal transplants

Intravenous immunoglobulin (IVIG) plays a central role in the treatment of antibody-mediated rejection (AMR) of renal allografts, but the treatment outcomes for late AMR (>6months after transplantation) are poor. We performed a retrospective study to assess the response patterns of IVIG-based (2g/kg) desensitization for late AMR. Patients who received desensitization after the pathological diagnosis of late AMR positive for complement component C4d were grouped as the Desensitized Group and compared to a historical Control Group with complement component C4d positivity in retrospective stainings. The 10-year graft survival of the Desensitized Group (73.9%, n=35) was significantly better than that of the historical Control Group (35.0%, n=40) without desensitization. In the Desensitized Group, a subgroup of patients (D2 Subgroup, n=11), who responded to desensitization initially but deteriorated later, was identified to benefit from repeated cycles of desensitization at 31.1±20.9months. Patients receiving only one cycle of desensitization were further grouped into D1-good (n=10) and D1-poor (n=14) based on their long-term renal function. The D2 Subgroup patients did not exhibit significant improvements in renal function compared to the D1-poor patients, until 30months after IVIG-based desensitization, suggesting desensitization therapy has a working window of approximately 24months. Repeated cycles of IVIG-based desensitization help stabilize long-term renal function in patients with persistent AMR.

Postoperative elevation in creatine kinase and its impact on renal function in patients undergoing complex partial nephrectomy.

To identify the risk factors associated with development of postoperative elevation of creatine kinase (CK) and study its effect on renal function in patients who underwent complex multifocal partial nephrectomy (PN). Patients who underwent PN at National Cancer Institute between January 2007 and December 2012 were included in the study. Elevated serum CK was defined as >2000U/L. Kidney function was assessed using serum creatinine and estimated glomerular filtration rate (eGFR). Changes were reported as percent change from preoperative values and compared using the Wilcoxon test. Regression analysis was performed to identify the predictors of elevation in CK and decline in eGFR. From 407 total cases, 207 had adequate CK data for analysis. Median number of tumors removed was 3 (1-70). Median peak CK was 1458 (82-36,788). Forty-two percent developed CK elevation >2000U/L. Factors associated with postoperative elevation of CK>2000 were young age (p=0.009), high BMI (p=0.003) and operating room time (p<0.001). Although CK>2000 was associated with significantly greater decline in eGFR (37.4 vs. 20.3%, p<0.001) in immediate postoperative period, this change largely resolved to a much less clinically relevant (9.2 vs 3.3 %, p=0.040) change after 3months. On multivariate analysis, postoperative elevation in CK was not found to be an independent factor determining renal function at 3months. In our cohort, a significant proportion of patients developed CK elevations >2000U/L. While patients with elevated CK had more decline in eGFR in immediate postoperative period, postoperative elevations of CK did not appear to impact overall long-term renal function in patients undergoing PN.

MP51-18 POST PERCUTANEOUS NEPHROLITHOTOMY HEMORRHAGE: ASSESSMENT OF FACTORS ASSOCIATED WITH A NEGATIVE RENAL ANGIOGRAM

INTRODUCTION AND OBJECTIVES: The impact of percutaneous nephrolithotripsy (PCNL) on renal function is an especially important consideration in stone formers with solitary kidneys. The objectives of this study were to evaluate the effect of PCNL on kidney function and further characterize patient demographics and perioperative outcomes of this unique cohort. METHODS: A retrospective review of medical records was performed on patients with a solitary or single functioning renal unit who underwent PCNL at a single institution between 1990 and 2013. Data on early and long-term post-operative renal function were collected and analyzed. Patient demographics and perioperative factors were compared to our larger cohort of PCNL patients and evaluated as potential predictors of post-operative renal function. RESULTS: Of 2318 patients, there were 76 PCNL events for patients with a solitary renal unit (40 female and 36 male). Long-term data (over 2 years post-operatively) was available for 48 PCNL events (24 female and 24 male). Estimated glomerular function (eGFR) slightly worsened in the early post-operative period, from 51 2.9 to 47 2.7 ml/min/1.73m2 (p <0.01). In the long-term however, eGFR improved, from 48 3.7 to 57 5.9 ml/min/1.73m2 (p <0.02). Predominant stone compositions included 19.7% cysteine, 19.7% calcium oxalate monohydrate and 11.8% and struvite. Compared to the larger cohort of PCNL patients, age, sex, complications, and stone free rates were consistent. Patients with solitary kidneys had more medical co-morbidities (64.7% vs 45%), with higher rates of diabetes (18.4% vs 13%) and pre-existing renal impairment (18.4% vs 3%). Univariate analyses of patient age, sex, comorbidities, stone composition, stone size, number of tracts and stone free rates were unable to identify a significant predictor of early and long-term postoperative renal function. CONCLUSIONS: These results show that while in the early post-operative period renal function slightly declines, it recovers in the long-term post PCNL for patients with solitary kidneys. Based on these findings, PCNL correlates with overall improved long-term renal function in patients with solitary kidneys. Given the higher rate of pre-existing medical co-morbidity and likely history of recurrent stone disease (high rates of cysteine and struvite stones), this solitary kidney cohort is presumably a high-risk population for future renal impairment. This further emphasizes the need to preserve renal function with PCNL in stone formers with solitary kidneys.

MP51-17 IMPACT OF PERCUTANEOUS NEPHROLITHOTRIPSY ON EARLY AND LONG-TERM RENAL FUNCTION IN PATIENTS WITH A SOLITARY KIDNEY

INTRODUCTION AND OBJECTIVES: The impact of percutaneous nephrolithotripsy (PCNL) on renal function is an especially important consideration in stone formers with solitary kidneys. The objectives of this study were to evaluate the effect of PCNL on kidney function and further characterize patient demographics and perioperative outcomes of this unique cohort. METHODS: A retrospective review of medical records was performed on patients with a solitary or single functioning renal unit who underwent PCNL at a single institution between 1990 and 2013. Data on early and long-term post-operative renal function were collected and analyzed. Patient demographics and perioperative factors were compared to our larger cohort of PCNL patients and evaluated as potential predictors of post-operative renal function. RESULTS: Of 2318 patients, there were 76 PCNL events for patients with a solitary renal unit (40 female and 36 male). Long-term data (over 2 years post-operatively) was available for 48 PCNL events (24 female and 24 male). Estimated glomerular function (eGFR) slightly worsened in the early post-operative period, from 51 2.9 to 47 2.7 ml/min/1.73m2 (p <0.01). In the long-term however, eGFR improved, from 48 3.7 to 57 5.9 ml/min/1.73m2 (p <0.02). Predominant stone compositions included 19.7% cysteine, 19.7% calcium oxalate monohydrate and 11.8% and struvite. Compared to the larger cohort of PCNL patients, age, sex, complications, and stone free rates were consistent. Patients with solitary kidneys had more medical co-morbidities (64.7% vs 45%), with higher rates of diabetes (18.4% vs 13%) and pre-existing renal impairment (18.4% vs 3%). Univariate analyses of patient age, sex, comorbidities, stone composition, stone size, number of tracts and stone free rates were unable to identify a significant predictor of early and long-term postoperative renal function. CONCLUSIONS: These results show that while in the early post-operative period renal function slightly declines, it recovers in the long-term post PCNL for patients with solitary kidneys. Based on these findings, PCNL correlates with overall improved long-term renal function in patients with solitary kidneys. Given the higher rate of pre-existing medical co-morbidity and likely history of recurrent stone disease (high rates of cysteine and struvite stones), this solitary kidney cohort is presumably a high-risk population for future renal impairment. This further emphasizes the need to preserve renal function with PCNL in stone formers with solitary kidneys.

Functional and clinical evaluation of renal injury in patients treated with adjuvant chemoradiotherapy for gastric cancer: Low dose and comorbidity considerations

AimTo analyze the dosimetric factors affecting long-term renal function in patients with gastric cancer following postoperative radiotherapy with concomitant chemotherapy to the upper abdomen. MethodsBetween January 2005 and July 2010, 13 patients treated with three-dimensional conformal radiotherapy and concurrent fluorouracil-based chemotherapy (CRT) were included in this analysis. After a median follow-up of 55 months, creatinine, glomerular filtration rate (GFR), total kidney and left kidney volumes, before and after CRT and mercaptoacetyltriglycine (MAG3) scintigraphy, were used to evaluate the renal function and were correlated with the dosimetrics data. ResultsSignificant correlations were found in the loss of left kidney volume and V35 (20.6%) (p = 0.035) and V40 (15.7%) (p = 0.031) and in the loss of relative functional contribution of the main kidney and V35 Gy (p = 0.027) and V40 Gy (p = 0.019). In patients with a slightly low basal GFR (n = 6), the relative functional contribution of the left kidney significantly decreased, regardless of the dosage. ConclusionFunctional renal impairment without any clinical signs or symptoms can be observed in low doses after radiotherapy. Careful treatment planning and a detailed evaluation of the functional renal capacity before treatment may help to reduce late renal toxicity.