Exploring the Role of Serum Cystatin C in Early Detection of Acute Kidney Injury among On-Pump Cardiac Surgery Patients: A Single-Center Investigation in Bangladesh

Background: Acute Kidney Injury (AKI) stands as a prominent postoperative complication in on-pump cardiac surgery, with repercussions on morbidity, mortality, and hospitalization duration. Current diagnostic criteria relying on serum creatinine levels exhibit a delayed identification of AKI, prompting an exploration of alternative biomarkers. Aims and Objectives: This study is designed to overcome diagnostic constraints and explore the viability of serum Cystatin C as an early predictor of Acute Kidney Injury (AKI) in individuals undergoing on-pump cardiac surgery. The investigation aims to establish the relationship between serum Cystatin C levels and the onset of AKI in patients subjected to on-pump cardiac surgery. Primary objectives involve the assessment of the diagnostic effectiveness of serum Cystatin C, its comparison with serum creatinine, and the exploration of its potential for the early identification and treatment of AKI. Methodology: Conducted as a single-center study at the cardiac surgery department of BSMMU in Bangladesh from September 2020 to August 2022, a comparative cross-sectional analysis involved 31 participants categorized into No AKI and AKI groups based on Kidney Disease: Improving Global Outcomes (KDIGO) criteria. Data collection encompassed preoperative, post-CBP (cardiopulmonary bypass) conclusion at 2 hours, postoperative day 1, and postoperative day 2 intervals. Statistical analyses included Chi-squared tests, independent Student’s t-tests, and one-sample t-tests. Significance was set at P Results: The study revealed no significant differences in baseline characteristics between the No AKI and AKI groups, except for CPB time and cross-clamp time. Serum Cystatin C levels in the AKI group exhibited statistical significance at various time points, highlighting its potential as an early detector. Conversely, Serum Creatinine levels in the AKI group showed no statistical significance. The Receiver Operating Characteristic (ROC) curve analysis further supported the efficacy of serum Cystatin C, with an Area under the ROC Curve of 0.864 and a cut-off value of 0.55 (p Conclusion: This study supports the superior utility of serum Cystatin C as an early detector of AKI in on-pump cardiac surgery patients compared to serum creatinine. Its ability to identify AKI several hours earlier may contribute to reduced morbidity, mortality, and healthcare costs. The findings underscore the significance of exploring novel biomarkers for improved post-cardiac surgery renal function assessment.

Preoperative Serum Albumin Levels and Postoperative Acute Kidney Injury in Off-Pump Coronary Artery Bypass Surgery: A Single-Center Study in Bangladesh

Background: Serum albumin, a vital plasma protein, helps maintain intravascular colloidal osmotic pressure, cardiac output, and renal function. Low preoperative serum albumin is linked to poor outcomes, including acute kidney injury (AKI), after off-pump coronary artery bypass (OPCAB) surgery. This study aimed to assess the relationship between preoperative serum albumin levels and early postoperative renal injury. Methods: This prospective comparative cross-sectional study was conducted from August 2019 to February 2021 at the National Heart Foundation Hospital & Research Institute, Bangladesh. It included 160 adult patients with normal preoperative renal function undergoing OPCAB. Patients were divided into two groups: Group A (serum albumin ≥ 4.0 gm/dl) and Group B (serum albumin Results: Preoperative serum albumin was significantly different between groups (Group A: 4.21 ± 0.05 gm/dl, Group B: 3.69 ± 0.04 gm/dl, p = 0.028). Group B had a higher incidence of hypertension (71.25% vs. 51.25%, p st and 3rd postoperative days were higher in Group B (p th day. Postoperative AKI occurred in 18.75% of Group A and 36.25% of Group B. Multivariate regression indicated that low preoperative serum albumin is an independent risk factor for postoperative AKI (p = 0.012, OR = 1.815, CI: 0.675 - 1.162). Conclusion: Preoperative serum albumin level is a valuable predictor of postoperative renal function. Ensuring high normal serum albumin levels before surgery can help minimize the risk of postoperative AKI.

Intraoperative Blood Glucose Levels and Postoperative Acute Kidney Injury in Pediatric Patients Having Congenital Heart Surgery under Cardiopulmonary Bypass

Purpose:This study sought to explore the effect of intraoperative mean blood glucose levels and variability on postoperative acute kidney injury(AKI)in children undergoing congenital cardiac surgery.Methods:We conducted a prospective nested case-control study in children(age<18 years)undergoing congenital heart surgery with cardiopulmonary bypass(CPB)at the Fuwai Hospital between April 01,2022 and July 30,2022.Cases were individuals who developed AKI within the first postoperative 7 days(AKI group)and controls were those without AKI(Non-AKI group)according to KDIGO criteria.AKI and Non-AKI groups unmatched and 1:1 matched by age,sex,and baseline serum creatinine were separately analyzed.Multivariate logistic and conditional logistic regressions were used to assess the associations between blood glucose variables and AKI.Results:688 consecutively approached patients were included in the final analysis.On multivariate analysis,intra-CPB(adjusted odds ratio[OR]0.802;95%confidence interval[CI],0.706 to 0.912;p=0.001)and post-CPB(adjusted OR 0.830;95%CI,0.744 to 0.925;p=0.001)blood glucose levels were associated with postoperative AKI.There were no significant differences in pre-CPB blood glucose(adjusted OR 0.926;95%CI,0.759 to 1.129;p=0.446)or intraoperative glycemic fluctuations(adjusted OR 0.905;95%CI,0.723 to 1.132;p=0.382)between AKI and Non-AKI groups.Results based on matched cases and controls were consistent with those from the unmatched analyses.Conclusion:Higher intraoperative blood glucose levels during and after CPB were protective factors against postoperative AKI in pediatric patients after congenital heart surgery.

Incidence and peri-operative risk factors for development of acute kidney injury in patients after cardiac surgery:A prospective observational study

BACKGROUND Patients admitted to intensive care unit(ICU) after cardiac surgery develop acute kidney injury(AKI) immediately post-operation. We hypothesized that AKI occurs mainly due to perioperative risk factors and may affect outcome.AIM To assess peri-operative risk factors for AKI post cardiac surgery and its relationship with clinical outcome.METHODS This was an observational single center, tertiary care setting study, which enrolled 206 consecutive patients, admitted to ICU after cardiac surgery. Patients were followed-up until ICU discharge or death, in order to determine the incidence of AKI, perioperative risk factors for AKI and its association with outcome.Univariate and multivariate logistic regression analysis was performed to assess predictor variables for AKI development.RESULTS After ICU admission, 55 patients(26.7%) developed AKI within 48 h. From the logistic regression analysis performed, high EuroScore Ⅱ(OR: 1.18;95%CI: 1.06-1.31, P = 0.003), white blood cells(WBC) pre-operatively(OR: 1.0;95%CI: 1.0-1.0, P = 0.002) and history of chronic kidney disease(OR: 2.82;95%CI: 1.195-6.65, P = 0.018) emerged as independent predictors of AKI among univariate predictors. AKI that developed AKI had longer duration of mechanical ventilation [1113(777–2195) vs 714(511–1020) min, P = 0.0001] and ICU length of stay [70(28–129) vs 26(21–51) h, P = 0.0001], higher rate of ICU-acquired weakness(16.4% vs 5.3%, P =0.015), reintubation(10.9% vs 1.3%, P = 0.005), dialysis(7% vs 0%, P = 0.005), delirium(36.4% vs 23.8%, P = 0.001) and mortality(3.6% vs 0.7%, P = 0.046).CONCLUSION Patients present frequently with AKI after cardiac surgery. EuroScore Ⅱ, WBC count and chronic kidney disease are independent predictors of AKI development. The occurrence of AKI is associated with poor outcome.

Impact of bariatric surgery on glucose and lipid metabolism and liver and kidney function in food-induced obese diabetic rats

BACKGROUND Obesity usually causes diabetes mellitus(DM)and is a serious danger to human health.Type 2 DM(T2DM)mostly occurs along with obesity.Foodborne obesityinduced DM is caused by an excessive long-term diet and surplus energy.Bariatric surgery can improve the symptoms of T2DM in some obese patients.But different types of bariatric surgery may have different effects.AIM To investigate the effect of bariatric surgery on glucose and lipid metabolism and liver and kidney function in rats.METHODS Male Sprague-Dawley rats aged 6-8 wk underwent Roux-en-Y gastric bypass surgery(RYGB),sleeve gastrectomy(SG),or gastric banding(GB).Glucose and insulin tolerance tests,analyses of biochemical parameters,histological examination,western blot,and quantitative real-time polymerase chain reaction were conducted.RESULTS In comparison to the sham operation group,the RYGB,SG,and GB groups had decreased body weight and food intake,reduced glucose intolerance and insulin insensitivity,downregulated biochemical parameters,alleviated morphological changes in the liver and kidneys,and decreased levels of protein kinase Cβ/P66shc.The effect in the RYGB group was better than that in the SG and GB groups.CONCLUSION These results suggest that RYGB,SG and GB may be helpful for the treatment of foodborne obesity-induced DM.

Short- and Long-Term Outcomes of Cardiac Surgery in Kidney Transplant Recipients: A Review—Kidney Transplant and Cardiac Surgery

Background: Cardiovascular diseases remain the leading cause of death in kidney transplant patients and increasing proportion of these patients are referred to cardiac surgery. Data on short- and long-term outcomes of these patients are limited to single center reports with no randomized trials and no prospective studies published previously. The aim of this review was to report both short- and long-term outcomes of these patients. Methods: Literature review was conducted using three databases from inception to June 2022. Multiple search terms were used and limited to English language. Thirty-one relevant articles were included. Outcomes of interest were short-term mortality, long-term survival, renal allograft failure and infection in kidney transplant patients undergoing cardiac surgery. Results: Cardiac risk factors (diabetes mellitus, hypertension, hyperlipidemia) were prevalent in kidney transplant patients. 30-days mortality ranged across the studies from zero to 18.8%. The 1-year survival ranged from 71% - 97% and 5-years survival ranged from 31% - 95.7%. Commonest causes of death were cardiac and sepsis. Multiple predictors of mortality were reported. Postoperative acute kidney injury ranged from 0 - 74% with most of them being transient. Kidney graft failure ranged from 0 - 45% with 5-year kidney graft survival rates ranged between 37% - 80%. Post-operative infection rates ranged from 1% - 25% and the most common sites were pneumonia followed by septicemia and surgical site infections. Conclusion: Cardiac surgery can be performed in kidney transplant patients with good short- and long-term results.

Multi-aspect analysis of ureteral access sheath usage in retrograde intrarenal surgery: A RIRSearch group study

Objective:To evaluate the effect of ureteral access sheath(UAS)use and calibration change on stone-free rate and complications of retrograde intrarenal surgery(RIRS).Methods:Data from 568 patients undergoing RIRS for kidney or upper ureteral stones were retrospectively included.Firstly,patients were compared after 1:1 propensity score matching,according to UAS usage during RIRS(UAS used[+]87 and UAS non-used[−]87 patients).Then all UAS+patients(n=481)were subdivided according to UAS calibration:9.5-11.5 Fr,10-12 Fr,11-13 Fr,and 13-15 Fr.Primary outcomes of the study were the success and complications of RIRS.Results:Stone-free rate of UAS+patients(86.2%)was significantly higher than UAS−patients(70.1%)after propensity score matching(p=0.01).Stone-free rate increased with higher caliber UAS(9.5-11.5 Fr:66.7%;10-12 Fr:87.0%;11-13 Fr:90.6%;13-15 Fr:100%;p<0.001).Postoperative complications of UAS+patients(11.5%)were significantly lower than UAS−patients(27.6%)(p=0.01).Complications(8.7%)with 9.5-11.5 Fr UAS was lower than thicker UAS(17.2%)but was not statistically significant(p=0.09).UAS usage was an independent factor predicting stone-free status or peri-and post-operative complications(odds ratio[OR]3.654,95%confidence interval[CI]1.314-10.162;OR 4.443,95%CI 1.350-14.552;OR 4.107,95%CI 1.366-12.344,respectively).Conclusion:Use of UAS in RIRS may increase stone-free rates,which also increase with higher caliber UAS.UAS usage may reduce complications;however,complications seemingly increase with higher UAS calibration.

Machine learning approach to predict acute kidney injury after liver surgery

BACKGROUND Acute kidney injury(AKI)after surgery appears to increase the risk of death in patients with liver cancer.In recent years,machine learning algorithms have been shown to offer higher discriminative efficiency than classical statistical analysis.AIM To develop prediction models for AKI after liver cancer resection using machine learning techniques.METHODS We screened a total of 2450 patients who had undergone primary hepatocellular carcinoma resection at Changzheng Hospital,Shanghai City,China,from January 1,2015 to August 31,2020.The AKI definition used was consistent with the Kidney Disease:Improving Global Outcomes.We included in our analysis preoperative data such as demographic characteristics,laboratory findings,comorbidities,and medication,as well as perioperative data such as duration of surgery.Computerized algorithms used for model development included logistic regression(LR),support vector machine(SVM),random forest(RF),extreme gradient boosting(XGboost),and decision tree(DT).Feature importance was also ranked according to its contribution to model development.RESULTS AKI events occurred in 296 patients(12.1%)within 7 d after surgery.Among the original models based on machine learning techniques,the RF algorithm had optimal discrimination with an area under the curve value of 0.92,compared to 0.87 for XGBoost,0.90 for DT,0.90 for SVM,and 0.85 for LR.The RF algorithm also had the highest concordance-index(0.86)and the lowest Brier score(0.076).The variable that contributed the most in the RF algorithm was age,followed by cholesterol,and surgery time.CONCLUSION Machine learning algorithms are highly effective in discriminating patients at high risk of developing AKI.The successful application of machine learning models may help guide clinical decisions and help improve the long-term prognosis of patients.

Neutrophil-to-lymphocyte ratio predicts acute kidney injury occurrence after gastrointestinal and hepatobiliary surgery

BACKGROUND Postoperative acute kidney injury(AKI) is a complex pathological process involved intrarenal and systemic inflammation caused by renal hypoperfusion, nephrotoxic drugs and urinary obstruction. Neutrophil-to-lymphocyte ratio(NLR) is a marker of inflammation reflecting the progress of many diseases. However, whether NLR at admission can predict the occurrence of AKI after surgery in the intensive care unit(ICU) remains unknown.AIM To clarify the relationship between NLR and the occurrence of AKI in patients with gastrointestinal and hepatobiliary surgery in the ICU.METHODS A retrospective analysis of 282 patients receiving surgical ICU care after gastrointestinal and hepatobiliary surgery in our hospital from December 2014 to December 2018 was performed.RESULTS Postoperative AKI occurred in 84 patients(29.79%) in this cohort. NLR by the multivariate analysis was an independent risk factor for occurrence of postoperative AKI in patients with gastrointestinal and hepatobiliary surgery in the ICU. In this cohort, receiver operating characteristic curves of AKI occurrence showed that the optimal cut-off value of NLR was 8.380. NLR was found to be significantly correlated with the white blood cell count, neutrophil count, lymphocyte count, arterial lactate and dialysis(P < 0.05). Additionally, NLR value at admission was higher in AKI patients compared with the non-AKI patients and increased with the severity of AKI. Patients with NLR ≥ 8.380 exhibited significantly higher incidences of postoperative AKI and severe AKI than patients with NLR < 8.380(AKI: 38.12% vs 14.85%, P < 0.001;severe AKI: 14.36% vs 1.98%, P = 0.001).CONCLUSION NLR at admission is a predictor of AKI occurrence in patients with gastrointestinal and hepatobiliary surgery in ICU. NLR should be included in the routine assessment of AKI occurrence.

Novel biomarkers of acute kidney injury: Evaluation and evidence in urologic surgery

atients undergoing urologic surgery are at risk of acute kidney injury （AKI） and consequently long-term deterioration in renal function. AKI is further associated with signifcantly higher odds of perioperative complications, prolonged hospital stay, higher mortality and costs. Therefore, better awareness and detection of AKI, as well as identifcation of AKI determinants in the urological surgery setting is warranted to pre-empt and mitigate further deterioration of renal function in patients at special risk. New consensus criteria provide precise definitions of diagnosis and description of the severity of AKI. However, they rely on serum creatinine （SCr）, which is known to be an inaccurate marker of early changes in renal function. Therefore, several newurinary and serum biomarkers promise to address the gap associated with the use of SCr. Novel biomarkers may complement SCr measurement or most likely improve the diagnostic accuracy of AKI when used in combinations. However, novel biomarkers have to prove their clinical applicability, accuracy, and cost effectiveness prior to implementation into clinical practice. Most preferably, novel biomarkers should help to positively improve a patient’s long-term renal functional outcomes. The purpose of this review is to discuss currently available biomarkers and to review their clinical evidence within urologic surgery settings.

Two acute kidney injury risk scores for critically ill cancer patients undergoing non-cardiac surgery

BACKGROUND:Several risk scoures have been used in predicting acute kidney injury(AKI)of patients undergoing general or specific operations such as cardiac surgery.This study aimed to evaluate the use of two AKI risk scores in patients who underwent non-cardiac surgery but required intensive care.METHODS:The clinical data of patients who had been admitted to ICU during the first 24 hours of ICU stay between September 2009 and August 2010 at the Cancer Institute,Chinese Academy of Medical Sciences & Peking Union Medical College were retrospectively collected and analyzed.AKI was diagnosed based on the acute kidney injury network(AKIN) criteria.Two AKI risk scores were calculated:Kheterpal and Abelha factors.RESULTS:The incidence of AKI was 10.3%.Patients who developed AKI had a increased ICU mortality of 10.9%vs.1.0%and an in-hospital mortality of 13.0 vs.1.5%,compared with those without AKI.There was a significant difference between the classification of Kheterpal's AKI risk scores and the occurrence of AKI(P<0.001).There was no significant difference between the number of Abelha's AKI risk scores and the occurrence of AKI(P=0.499).Receiver operating characteristic curves demonstrated an area under the curve of 0.655±0.043(P=0.001,95%confidence interval:0.571-0.739) for Kheterpal's AKI risk score and 0.507±0.044(P=0.879,95%confidence interval:0.422-0.592) for Abelha's AKI risk score.CONCLUSION:Kheterpal's AKI risk scores are more accurate than Abelha's AKI risk scores in predicting the occurrence of AKI in patients undergoing non-cardiac surgery with moderate predictive capability.

Risk factors for acute kidney injury following coronary artery bypass graft surgery in a Chinese population and development of a prediction model

BACKGROUND Acute kidney injury(AKI)after coronary artery bypass graft(CABG)surgery is associated with significant morbidity and mortality.This retrospective study aimed to establish a risk score for postoperative AKI in a Chinese population.METHODS A total of 1138 patients undergoing CABG were collected from September 2018 to May 2020 and divided into a derivation and validation cohort.AKI was defined according to the Kidney Disease Improving Global Outcomes(KDIGO)criteria.Multivariable logistic regression analysis was used to determine the independent predictors of AKI,and the predictive ability of the model was determined using a receiver operating characteristic(ROC)curve.RESULTS The incidence of cardiac surgery–associated acute kidney injury(CSA-AKI)was 24.17%,and 0.53%of AKI patients required dialysis(AKI-D).Among the derivation cohort,multivariable logistic regression showed that age≥70 years,body mass index(BMI)≥25 kg/m2,estimated glomerular filtration rate(eGFR)≤60 mL/min per 1.73 m2,ejection fraction(EF)≤45%,use of statins,red blood cell transfusion,use of adrenaline,intra-aortic balloon pump(IABP)implantation,postoperative low cardiac output syndrome(LCOS)and reoperation for bleeding were independent predictors.The predictive model was scored from 0 to32 points with three risk categories.The AKI frequencies were as follows:0-8 points(15.9%),9-17 points(36.5%)and≥18 points(90.4%).The area under of the ROC curve was 0.730(95%CI:0.691-0.768)in the derivation cohort.The predictive index had good discrimination in the validation cohort,with an area under the curve of 0.735(95%CI:0.655-0.815).The model was well calibrated according to the Hosmer-Lemeshow test(P=0.372).CONCLUSION The performance of the prediction model was valid and accurate in predicting KDIGO-AKI after CABG surgery in Chinese patients,and could improve the early prognosis and clinical interventions.

Comparison of the Effects of Minimally Invasive Percutaneous Nephrolithotomy and Open Surgery on Kidney Stones

Objective:To compare the treatment effects of minimally invasive percutaneous nephrolithotomy and open surgery on kidney stones.Methods:From November 2018 to November 2019,80 patients with kidney stones who were treated in our hospital were selected and divided into two groups according to the random number table method.Each group contained 40 patients.The patients in control group were treated with open surgery while the patients in observation group were treated with minimally invasive percutaneous nephrolithotomy.The surgical indicators,rate of stone removal,and adverse events were compared between the two groups.Results:There was no statistically significant difference in surgical time between the two groups(P>0.05).Compared with the control group,the observation group had less intraoperative blood loss and shorter hospital stay,and the differences were statistically significant(P<0.05).The stone clearance rate(95.00%)in the observation group was higher than that in the control group(77.50%),and the difference was statistically significant(P<0.05).Compared with the control group,the incidence of postoperative adverse effects was lower in the observation group,and the difference was statistically significant(P<0.05).Conclusion:Minimally invasive percutaneous nephrolithotomy for kidney stones is effective in reducing the intraoperative blood loss,shortening the length of hospital stay,improving the rate of stone clearance and reducing the occurrence of adverse effects.Therefore,this treatment method should be promoted for clinical use.

Upper Urinary Tract Calculi in Senegal: A Comparative Study between Open Surgery and Endoscopy, a Review of 89 Cases

Objective: The aim was to assess the place of endourologic intervention in our practice and compare it to open surgery in the management of upper urinary tract calculi in Senegal. Patients and Methods: This was a retrospective study conducted at both the Principal and Grand Yoff Hospitals of Dakar from January 2009 to December 2013 in which 89 patients with upper urinary tract calculi were mobilized. All patients with symptomatic upper urinary tract colic symptoms were included. Results: Eighty-nine were followed up during the study period, 63 men and 36 women (sex of ratio 1.2). The average age was 44 years with extremes 22 - 75 years. Forty two patients, including 28 men and 14 women (sex ratio 1: 2) were treated with open surgery. The mean age was 42.75 years (4 - 75 years). The average duration of hospitalization after open surgery was 8 days (4 - 60 days). The mean stone size in open surgery was 23 mm (5 mm - 45 mm). Complications noted were: 2 cases of urinomas (4.76%), 1 case of lower back fistula (2.38%), 1 case of renal pelvis fistula (2.38%) and 1 case (2.38%) of infection. Forty seven patients including 35 men (55.6%) and 12 women (46.2%) were treated by endourology. The average length of hospital stay was 2 days (2 d - 3 d). The average stone size treated by endourology was 13 mm (5 mm - 40 mm). No complications were observed in this group. The cost of open surgery was a third of that of endourology. Conclusion: Endoscopic surgery, as is observed from industrialized countries occupies a prominent place in the treatment of upper urinary tract calculi in Senegal;however, the only limiting factor encountered is the cost which remains out of reach for patients and burdening the budgets of our hospitals with limited means.

Successful endoscopic surgery for emphysematous pyelonephritis in a non-diabetic patient with autosomal dominant polycystic kidney disease: A case report

BACKGROUND Emphysema pyelonephritis(EPN)is a very dangerous type of urinary tract infection.It is a lethal disease that develops rapidly and causes the patient to deteriorate rapidly,and it can easily lead to systemic infections and even sepsis.The incidence is extremely low,and it is prevalent in patients with diabetes.We here report a case of EPN in a non-diabetic patient with autosomal dominant polycystic kidney disease(ADPKD).We share the diagnosis and treatment procedure for this extremely rare condition to make this disease easier to identify and address early.CASE SUMMARY A 47-year-old woman presented to the emergency department of our hospital with a high fever and left back pain lasting 4 d.She had a history of autosomal dominant polycystic kidney and polycystic liver.She was diagnosed with left type I EPN and her vital signs deteriorated so quickly that she underwent an emergency operation in which a D-J tube was inserted into her left ureter on the second day after admission.Two months later,she underwent a second-stage flexible ureteroscopy and lithotripsy.Despite postoperative sepsis,she finally recovered after active symptomatic support treatment and effective anti-infective treatment.CONCLUSION Although EPN is more likely to occur in diabetic patients,for non-diabetic patients with ADPKD and upper urinary tract obstruction,the disease also causes rapid deterioration.Early and accurate diagnosis and timely removal of the obstruction by invasive means may be able to save the damaged kidney and the patient’s life.

Acute kidney injury following spinal instrumentation surgery in children

AIM To determine acute kidney in jury （AKI） incidence and potential risk factors of AKI in children undergoing spinal instrumentation surgery. METHODS AKI incidence in children undergoing spinal instru-mentation surgery at British Columbia Children’s Hospital between January 2006 and December 2008 was determined by the Acute Kidney Injury Networ classification using serum creatinine and urine output criteria. During this specific time period, all patients following spinal surgery were monitored in the pediatric intensive care unit and had an indwelling Foley catheter permitting hourly urine output recording. Cases of AKI were identifed from our database. From the remaining cohort, we selected group-matched controls that did not satisfy criteria for AKI. The controls were matched for sex, age and underlying diagnosis （idiopathic vs non-idiopathic scoliosis）. RESULTS Thirty five of 208 patients met criteria for AKI with an incidence of 17% （95%CI： 12%-23%）. Of all children who developed AKI, 17 （49%） developed mild AKI （AKI Stage 1）, 17 （49%） developed moderate AKI （Stage 2） and 1 patient （3%） met criteria for severe AKI （Stage 3）. An inverse relationship was observed with AKI incidence and the amount of fluids received intra-operatively. An inverse relationship was observed with AKI incidence and the amount of fuids received intra-operatively classifed by fluid tertiles： 70% incidence in those that received the least amount of fluids vs 29% that received the most fluids （〉 7.9, P = 0.02）. Patients who developed AKI were more frequently exposed to nephrotoxins （non steroidal anti inflammatory drugs or aminoglycosides） than control patients during their peri-operative course （60% vs 22%, P 〈 0.001）. CONCLUSION We observed a high incidence of AKI following spinal instrumentation surgery in children that is potentially related to the frequent use of nephrotoxins and the amount of fuid administered peri-operatively.

Patient Frailty Can Increase the Risk of Acute Kidney Injury after Cardiac Surgery: Pilot Study

Background: Acute kidney injury (AKI) is a severe common postoperative complication of cardiac surgery (CS). It increases the risk of mortality by up to 80%. Therefore, it is essential to have preoperative risk evaluation tools. Frailty is a marker of deterioration of physiologic systems and may be associated with AKI. Purpose: The study aimed to determine the utility of frailty as a predictor of AKI after CS. Method: We enrolled 91 patients undergoing CS with cardiopulmonary bypass to determine if they had frailty before surgery and were associated with postoperative AKI. The diagnosis of postoperative AKI was based on the serum creatinine criteria of the Acute Kidney Injury Network classification up to 7 days following CS. Results: The incidence of postoperative AKI was 62% in the frail group and 21% in the non-frail group. Frailty was associated with a higher risk of AKI (relative risk [RR] = 3.00, 95% CI 1.56 - 5.77, p = 0.00). In regression models, there were associations between frailty and postoperative AKI. Conclusion: This study demonstrated that frailty could be a predictor for post-CS AKI. Therefore, frailty assessment should become an essential part of the preoperative evaluation to help the anesthesiologist to estimate the surgical risk and develop preoperative and transoperative strategies to preserve the renal function and improve the cardiac surgery outcome.

Comparison of the trauma between combined retrograde intrarenal surgery and mini-percutaneous nephrolithotomy for upper ureteral calculi

Objective: To compare the trauma between combined retrograde intrarenal surgery and mini-percutaneous nephrolithotomy for upper ureteral calculi. Methods: Patients with upper ureteral calculi who received lithotripsy in Pengzhou Hospital of Traditional Chinese Medicine between February 2015 and March 2017 were selected and randomly divided into two groups;RIRS group received combined retrograde intrarenal surgery and the Mini-PCNL group received mini-percutaneous nephrolithotomy. 3 d after surgery;the contents of liver and kidney function indexes and stress hormones in serum as well as the expression of CD4+T cell transcription factors in peripheral blood were measured. Results: Serum ALT;AST;γ-GT;BUN and Cr contents of RIRS group 3 d after surgery were not significantly different from those of Mini-PCNL group;and HO-1;ET-1;ACTH;Cor and YKL-40 contents in serum as well as RORγt and T-bet mRNA expression in peripheral blood were significantly lower than those of Mini-PCNL group while Gata-3 and Foxp3 mRNA expression in peripheral blood were higher than those of Mini-PCNL group. Conclusion: Combined retrograde intrarenal surgery for upper ureteral calculi activates less stress response and inflammatory response than mini-percutaneous nephrolithotomy.

Effect of Humanistic Nursing Care on Health Knowledge Mastery and Nursing Satisfaction Among Patients Undergoing Kidney Stone Surgery

Objective:To deeply understand the influence of humanistic nursing care on the health knowledge mastery and nursing satisfaction among patients undergoing kidney stone surgery.Methods:Sixty patients with kidney stone who underwent surgical treatment in our hospital from June 2019 to June 2020 were randomly divided into reference group and experimental group by random number table method.There were 30 patients in each group.The patients of reference group were given routine nursing care,and the patients of experimental groups were given humanistic nursing care.The mastery score of various health knowledge,nursing satisfaction and postoperative complications were compared between the two groups.Results:The scores of health knowledge mastery among the patients in experimental group who were treated with humanistic nursing care were much higher than those in reference group who were treated with routine nursing care.The nursing satisfaction of patients in experimental group(96.67%)was significantly higher than that in reference group(80.00%),and the incidence of complications after kidney stone surgery in the experimental group(6.67%)was higher than that in the reference group(26.67%)(P<0.05).Conclusion:Humanistic nursing care is greatly conducive to the mastery of health knowledge in patients undergoing kidney stone surgery,and this nursing mode can meet the needs for nursing work and potentially minimize postoperative complications.

Role of simulation in kidney stone disease:A systematic review of literature trends in the 26 years

BACKGROUND Minimally invasive techniques for treatment of urinary stones requires expertise,experience and endoscopic skills.Simulators provide a low-stress and low-risk environment while providing a realistic set-up and training opportunities.AIM To report the publication trend of‘simulation in urolithiasis’over the last 26 years.METHODS Research of all published papers on“Simulation in Urolithiasis”was performed through PubMed database over the last 26 years,from January 1997 to December 2022.Papers were labelled and divided in three subgroups:(1)Training papers;(2)Clinical simulation application or surgical procedures;and(3)Diagnostic radiology simulation.Each subgroup was then divided into two 13-year time periods to compare and identify the contrast of different decades:period-1(1997-2009)and period-2(2010-2022).RESULTS A total of 168 articles published on the application of simulation in urolithiasis over the last 26 years(training:n=94,surgical procedures:n=66,and radiology:n=8).The overall number of papers published in simulation in urolithiasis was 35 in Period-1 and 129 in Period-2,an increase of+269%(P=0.0002).Each subgroup shows a growing trend of publications from Period-1 to Period-2:training papers+279%(P=0.001),surgical simulations+264%(P=0.0180)and radiological simulations+200%(P=0.2105).CONCLUSION In the last decades there has been a step up of papers regarding training protocols with the aid of various simulation devices,with simulators now a part of training programs.With the development of 3D-printed and high-fidelity models,simulation for surgical procedure planning and patients counseling is also a growing field and this trend will continue to rise in the next few years.