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| 1 | Influence of heat treatment on the machinability and corrosion behavior of AZ91 Mg alloy显示文摘In the present study,AZ91 Mg alloy was heat treated at 410℃ for 6,12 and 24 h to investigate the influence of heat treatment on machinability and corrosion behavior.The effect of soaking time on the amount and distribution of Mg 17 Al 12(β-phase)was analyzed under the optical microscope.Microhardness measurements demonstrated the increased hardness with increased heat treatment soaking time,which can be attributed to the solid solution strengthening.The influence of super saturatedα-grains on reducing the cutting force(F z)with respect to increased cutting speed was observed as prominent.The corrosion behavior of the heat treated specimens was studied by conducting electrochemical tests.Surprisingly,corrosion rate of heat treated samples was observed as increased compared with the base material.From the results,it is evident that the machinability of AZ91 Mg alloy can be improved by producing super saturatedα-grains through heat treatment but at the cost of losing corrosion resistance. | Swetha Chowdary V Ravikumar Dumpala Anand Kumar S Kondaiah VV Ratna Sunil B | 2018 | Journal of Magnesium and Alloys2018，6，1： | 7 |
| 2 | Laparoscopic vs open partial colectomy in elderly patients:Insights from the American College of Surgeons- National Surgical Quality Improvement Program database显示文摘AIM: To compare the outcomes between the laparoscopic and open approaches for partial colectomy in elderly patients aged 65 years and over using the American College of Surgeons- National Surgical Quality Improvement Program(ACS NSQIP) database. METHODS: The ACS NSQIP database for the years 2005-2011 was queried for all patients 65 years and above who underwent partial colectomy. 1:1 propensity score matching using the nearest- neighbor method was performed to ensure both groups had similar preoperative comorbidities. Outcomes including postoperative complications, length of stay and mortality were compared between the laparoscopic and open groups. χ2 and Fisher's exact test were used for discrete variables and Student's t-test for continuous variables. P < 0.05 was considered significant and odds ratios with 95%CI were reported when applicable. RESULTS: The total number of patients in the ACS NSQIP database of the years 2005-2011 was 1777035. We identified 27604 elderly patients who underwent partial colectomy with complete data sets. 12009(43%) of the cases were done laparoscopically and15595(57%) were done with open. After propensity score matching, there were 11008 patients each in the laparoscopic(LC) and open colectomy(OC) cohorts. The laparoscopic approach had lower post-operative complications(LC 15.2%, OC 23.8%, P < 0.001), shorter length of stay(LC 6.61 d, OC 9.62 d, P < 0.001) and lower mortality(LC 1.6%, OC 2.9%, P < 0.001). CONCLUSION: Even after propensity score matching, elderly patients in the ACS NSQIP database having a laparoscopic partial colectomy had better outcomes than those having open colectomies. In the absence of specific contraindications, elderly patients requiring a partial colectomy should be offered the laparoscopic approach. | Umashankkar Kannan Vemuru Sunil K Reddy Amar N Mukerji Vellore S Parithivel Ajay K Shah Brian F Gilchrist Daniel T Farkas | 2015 | World Journal of Gastroenterology2015，21，45： | 3 |
| 3 | Evaluating the accuracy of American Society for Gastrointestinal Endoscopy guidelines in patients with acute gallstone pancreatitis with choledocholithiasis显示文摘BACKGROUND Acute gallstone pancreatitis(AGP) is the most common cause of acute pancreatitis(AP) in the United States. Patients with AGP may also present with choledocholithiasis. In 2010, the American Society for Gastrointestinal Endoscopy(ASGE) suggested a management algorithm based on probability for choledocholithiasis, recommending additional imaging for patients at intermediate risk and endoscopic retrograde cholangiopancreatography(ERCP) for patients at high risk of choledocholithiasis. In 2019, the ASGE guidelines were updated using more specific criteria to categorize individuals at high risk for choledocholithiasis. Neither ASGE guideline has been studied in AGP to determine the probability of having choledocholithiasis.AIM To determine compliance with ASGE guidelines, assess outcomes, and compare 2019 vs 2010 ASGE criteria for suspected choledocholithiasis in AGP.METHODS We conducted a retrospective cohort study of 882 patients admitted with AP to a single tertiary care center from 2008-2018. AP was diagnosed using revised Atlanta criteria and AGP was defined as the presence of gallstones on imaging or with cholestatic pattern of liver injury in the absence of another cause. Patients with chronic pancreatitis and pancreatic malignancy were excluded as were those who went directly to cholecystectomy prior to assessment for choledocholithiasis. Patients were assigned low, intermediate or high risk based on ASGE guidelines. Our primary outcomes of interest were the proportion of patients in the intermediate risk group undergoing magnetic resonance cholangiopancreatography(MRCP) first and the proportion of patients in the high risk group undergoing ERCP directly without preceding imaging. Secondary outcomes of interest included outcome differences based on if guidelines were not adhered to. We then evaluated the diagnostic accuracy of 2019 in comparison to the 2010 ASGE criteria for patients with suspected choledocholithiasis. We performed the t test or Wilcoxon rank sum test, as appropriate, to analyze if there were outcome differences based on if guidelines were not adhered to. Kappa coefficients were calculated to measure the degree of agreement between pairs of variables.RESULTS In this cohort, we identified 235 patients with AGP of which 79 patients were excluded as they went directly to surgery for cholecystectomy without prior MRCP or ERCP. Of the remaining 156 patients, 79 patients were categorized as intermediate risk and 77 patients were high risk for choledocholithiasis according to the 2010 ASGE guidelines. Among 79 intermediate risk patients, 54(68%) underwent MRCP first whereas 25 patients(32%) went directly to ERCP. For the 54 patients with intermediate risk who had MRCP first, 36 patients had no choledocholithiasis while 18 patients had evidence of choledocholithiasis prompting ERCP. Of these patients, ERCP confirmed stone disease in 11 patients. Of the 25 intermediate risk patients who directly underwent ERCP, 18 patients had stone disease. One patient with a normal ERCP developed post ERCP pancreatitis. Patients undergoing MRCP in this group had a significantly longer length of stay(5.0 vs 4.0 d, P = 0.02). In the high risk group, 64 patients(83%) had ERCP without preceding imaging, of which, 53 patients had findings consistent with choledocholithiasis, of which 13 patients(17%) underwent MRCP before ERCP, all of which showed evidence of stone disease. Furthermore, all of these patients ultimately had an ERCP, of which 8 patients had evidence of stones and 5 had normal examination.RESULTS Our cohort also demonstrated that 58% of all 156 patients with AGP had confirmed choledocholithiasis(79% of the high risk group and 37% of the intermediate group when risk was assigned based on the 2010 ASGE guidelines). When the updated 2019 ASGE guidelines were applied instead of the original 2010 guidelines, there was moderate agreement between the 2010 and 2019 guidelines(kappa = 0.46, 95%CI: 0.34-0.58). Forty-two of 77 patients were still deemed to be high risk and 35 patients were downgraded to intermediate risk. Thirty-five patients who were originally assigned high risk were reclassified as intermediate risk. For these 35 patients, 26 patients had ERCP findings consistent with choledocholithiasis and 9 patients had a normal examination. Based on the 2019 criteria, 9/35 patients who were downgraded to intermediate risk had an unnecessary ERCP with normal findings(without a preceding MRCP).CONCLUSION Two-thirds in intermediate risk and 83% in high risk group followed ASGE guidelines for choledocholithiasis. One intermediate-group patient with normal ERCP had post-ERCP AP, highlighting the risk of unnecessary procedures. | Supisara Tintara Ishani Shah William Yakah Awais Ahmed Cristina S Sorrento Cinthana Kandasamy Steven D Freedman Darshan J Kothari Sunil G Sheth | 2022 | World Journal of Gastroenterology2022，28，16： | 3 |
| 4 | Choledochal cyst with large stone cast and portal hypertension显示文摘BACKGROUND:Choledochal cysts in adults are more commonly associated with complications such as cystolithiasis,recurrent cholangitis,portal hypertension and malignancy,than in the pediatric age group.METHOD:We report a case of adult choledochal cyst with long-term complication of large stone cast and portal hypertension due to secondary biliary cirrhosis.RESULTS:A 50-year-old patient presented with obstructive jaundice and hepatosplenomegaly.On investigation,she was diagnosed as having a choledochal cyst with large stone cast and portal hypertension.Single stage resection of the choledochal cyst with Roux-en-Y hepaticojejunostomy was done by meticulous dissection and ligation of collaterals.CONCLUSION:Single stage resection of a choledochal cyst is possible in spite of associated portal hypertension,if the portal vein is patent. | Shivendra Singh Laxman Singh Kheria Sunil Puri Amrinder S Puri Anil K Agarwal | 2009 | Hepatobiliary & Pancreatic Diseases International2009，8，6： | 2 |
| 5 | Nonalcoholic steatohapatitis显示文摘 | Sunil G Fredric D Chopra S | 1997 | Ann Intern Med1997，126，： | 1 |
| 6 | Adsorption of carbon dioxide,methane,nitrogen,oxygen and argon in NaETS-4显示文摘 | PILLAI S Renjith PETER A Sunil JASRA V Raksh | 2008 | Microporous and Mesoporous Materials2008，，113： | 1 |
| 7 | Expression of flavonoid biosynthesis genes vis-à-vis rutin content variation in different growth stages of Fagopyrum species显示文摘 | NIDHI G SUNIL K S JAI C R | | 0，，： | 1 |
| 8 | Early nasal intermittent positive pressure ventilation versus continuous positive airway pressure for respiratory distress syndrome显示文摘 | Sai Sunil Kishore M Dutta S Kumar P | 2009 | Acta Paediatr2009，98，9： | 1 |
| 9 | Managing Risk to Avoid supply-Chain Breakdown显示文摘 | SUNIL C MANMOHAN S S | 2004 | MIT Sloam Management Review2004，，3： | 1 |
| 10 | United States' International Retirement Migratian:The Reasons for Retiring to the Environs of Lake Chapala, Mexico 显示文摘 | Sunil T S Rojas V Bradley D E | 2007 | Ageing and Society2007，27，4： | 1 |
| 11 | Positive effect s of metformin inchildhood insulin resist an cesyndrome显示文摘 | Svetlana T Sunil S Amrit B | | 0，，02： | 1 |
| 12 | Automatic recognition of features from freeform surface CAD models 显示文摘 | Sunil V B Pande S S | 2008 | Computer-Aided Design2008，40，4： | 1 |
| 13 | Radial basis function neural network for approximation and estimation of nonlinear stochastic dynamic systems 显示文摘 | YUNG C S | 1994 | IEEE Trans on Neural Networks1994，5，4： | 1 |
| 14 | An optimal algorithm for approximate nearest neighbor searching in fixed dimensions 显示文摘 | Sunil Arya David M Mount Nathan S Netanyahu Ruth Silverman Angela Y Wu | 1998 | Journal of the ACM1998，45，6： | 1 |
| 15 | Sorption of Nz,O2,and Ar in Mn ( lI )-Exchanged Zeolite A and X Using Volumetric Mea- surements and Grand Canonical Monte Carlo Simulation显示文摘 | SEBASTIAN J PILLAI R S SUNIL A | 2007 | Ind Eng Chem Res2007，46，3： | 1 |
| 16 | Sr and ^87Sr/^86 Sr in waters and sediments of the Brahmaputra river systems Silicate weathering,CO2 consumption and Sr flux显示文摘 | Sunil K S Anil K Christian F L | 2006 | Chemical Geology2006，234，： | 1 |
| 17 | Water balanceapproach for rainwater harvesting using remote sensingand GIS techniques, jammu himalaya, India显示文摘 | Jasrotia S Abinash Majhi Sunil Singh | 2009 | WaterResour Manage2009，23，14： | 1 |
| 18 | An approach to recog- nize interacting features from B-Rep CAD models of prismatic machined parts using a hybrid (graph and rule based ) tech- nique显示文摘 | SUNIL V B AGARWAL R PANDE S S | 2010 | Computers in Industry2010，61，7： | 1 |
| 19 | Interactions of murine gammaherpesvirus 68 with B and T cell lines 显示文摘 | Sunil - Chandra N P Efstathiou S Nash A A | 1993 | Virology1993，193，2： | 1 |
| 20 | Extraction of extracellular polymericsubstances from aerobic granule with compact interior structure显示文摘 | Adav Sunil S Lee Duu-Jong | 2008 | Journal of Hazardous Materials2008，154，13： | 1 |
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