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| 1 | National trends in resection of the distal pancreas显示文摘AIM:To investigate national trends in distal pancreatectomy(DP) through query of three national patient care databases.METHODS:From the Nationwide Inpatient Sample(NIS,2003-2009),the National Surgical Quality Improvement Project(NSQIP,2005-2010),and the Surveillance Epidemiology and End Results(SEER,2003-2009) databases using appropriate diagnostic and procedural codes we identified all patients with a diagnosis of a benign or malignant lesion of the body and/or tail of the pancreas that had undergone a partial or distal pancreatectomy.Utilization of laparoscopy was defined in NIS by the International Classification of Diseases,Ninth Revision correspondent procedure code;and in NSQIP by the exploratory laparoscopy or unlisted procedure current procedural terminology codes.In SEER,patients were identified by the International Classification of Diseases for Oncology,Third Edition diagnosis codes and the SEER Program Code Manual,third edition procedure codes.We analyzed the databases with respect to trends of inpatient outcome metrics,oncologic outcomes,and hospital volumes in patients with lesions of the neck and body of the pancreas that underwent operative resection.RESULTS:NIS,NSQIP and SEER identified 4242,2681 and 11 082 DP resections,respectively.Overall,laparoscopy was utilized in 15%(NIS) and 27%(NSQIP).No significant increase was seen over the course of the study.Resection was performed for malignancy in 59%(NIS) and 66%(NSQIP).Neither patient Body mass index nor comorbidities were associated with operative approach(P = 0.95 and P = 0.96,respectively).Mortality(3% vs 2%,P = 0.05) and reoperation(4% vs 4%,P = 1.0) was not different between laparoscopy and open groups.Overall complications(10% vs 15%,P < 0.001),hospital costs [44 741 dollars,interquartile range(IQR) 28 347-74 114 dollars vs 49 792 dollars,IQR 13 299-73 463,P = 0.02] and hospital length of stay(7 d,IQR 4-11 d vs 7 d,IQR 6-10,P < 0.001) were less when laparoscopy was utilized.One and two year survival after resection for malignancy were unchanged over the course of the study(ductal adenocarinoma 1-year 63.6% and 2-year 35.1%,P = 0.53;intraductal papillary mucinous neoplasm and nueroendocrine 1-year 90% and 2-year 84%,P = 0.25).The majority of resections were performed in teaching hospitals(77% NIS and 85% NSQIP),but minimally invasive surgery(MIS) was not more likely to be used in teaching hospitals(15% vs 14%,P = 0.26).Hospitals in the top decile for volume were more likely to be teaching hospitals than lower volume deciles(88% vs 43%,P < 0.001),but were no more likely to utilize MIS at resection.Complication rate in teaching and the top decile hospitals was not significantly decreased when compared to non-teaching(15% vs 14%,P = 0.72) and lower volume hospitals(14% vs 15%,P = 0.99).No difference was seen in the median number of lymph nodes and lymph node ratio in N1 disease when compared by year(P = 0.17 and P = 0.96,respectively).CONCLUSION:There appears to be an overall underutilization of laparoscopy for DP.Centralization does not appear to be occurring.Survival and lymph node harvest have not changed. | Armando Rosales-Velderrain Steven P Bowers Ross F Goldberg Tatyan M Clarke Mauricia A Buchanan John A Stauffer Horacio J Asbun | 2012 | World Journal of Gastroenterology2012，18，32： | 8 |
| 2 | Advances in cellulose ester performance and application显示文摘 | Kevin J Edgar Charles M Buchanan John S Debenham Paul A Rundquist Brian D Seiler Michael C Shelton Debra Tindall | 2001 | Progress in Polymer Science2001，，9： | 2 |
| 3 | Terahertz Semiconductor Quantum Well Devices显示文摘For eventually providing terahertz science with compact and convenient devices,terahertz (1~10THz) quantum-well photodetectors and quantum-cascade lasers are investigated.The design and projected detector performance are presented together with experimental results for several test devices,all working at photon energies below and around optical phonons.Background limited infrared performance (BLIP) operations are observed for all samples (three in total),designed for different wavelengths.BLIP temperatures of 17,13,and 12K are achieved for peak detection frequencies of 9.7THz(31μm),5.4THz(56μm),and 3.2THz(93μm),respectively.A set of THz quantum-cascade lasers with identical device parameters except for doping concentration is studied.The δ-doping density for each period varies from 3.2×1010 to 4.8×1010cm-2.We observe that the lasing threshold current density increases monotonically with doping concentration.Moreover,the measurements for devices with different cavity lengths provide evidence that the free carrier absorption causes the waveguide loss also to increase monotonically.Interestingly the observed maximum lasing temperature is best at a doping density of 3.6×1010cm-2. | Liu H C Luo H Ban D Waichter M Song C Y Wasilewski Z R Buchanan M Aers G C SpringThorpe A J Cao J C Feng S L Williams B S Hu Q | 2006 | Journal of Semiconductors2006，27，4： | 2 |
| 4 | GaAs/AlGaAs多量子阱空间光调制器入射角度特性研究显示文摘研究了GaAs/AlGaAs多量子阱(MQW)空间光调制器(SLM)在不同入射角度下的调制特性。对腔模位置与入射角度的关系进行了理论计算和实验验证,两者具有较好的一致性。当入射角在0°~75°之间变化时,腔模从871nm变化至845nm,可调节范围达26nm。当入射光从垂直入射变化为约45°入射时,SLM对比度从(CR)3.8提高到16.3,调制电压从9.5V下降至6.5V。理论分析和实验结果表明,入射角度调节能够有效提高GaAs/AlGaAs MQW SLM调制性能。 | 黄寓洋 刘惠春 Wasilewski Z R Buchanan M Laframboise S R 杨晨 崔国新 边历峰 杨辉 张耀辉 | 2010 | 光电子.激光2010，21，5： | 2 |
| 5 | A randomized controlled crossover study comparing synthetic porcine and human secretins with biologically derived porcine secretin to diagnose Zollinger-Ellison Syndrome显示文摘 | METZ DC BUCHANAN M PURICH E | 2001 | Aliment Pharmacol Ther2001，5，15： | 1 |
| 6 | Involvement of chemokine receptors in breast cancer metastasis显示文摘 | Muller A Homey B Soto H Ge N Catron D Buchanan M E | 2001 | Nature2001，410，： | 1 |
| 7 | Ovine dinucleotide repent polymorphism at the MAF 33 Locus显示文摘 | Buchanan F C Crawford A M | 1992 | Animal Genetics1992，23，： | 1 |
| 8 | F0 membrane domain of ATP synthase from bovine heart mitochondria:purification subunit composition and reconstitution with F1-ATPase 显示文摘 | COLLINSON L R RUNSWICK M J BUCHANAN S K | 1994 | Biochem1994，33，25： | 1 |
| 9 | 10-cyclohexane oxidation reactions models mechanistic with active site methane monooxygenase enzyme and tbutyl hydroperoxide in aqueous micelles: insights and the role of t-butoxy radicals in the C-H functionalization reaction显示文摘 | RABION A BUCHANAN R M SERIS J L | 1997 | J Mol Catal A: Chem1997，116，： | 1 |
| 10 | Cardiovascular and neuroendocrine adjustment to public speaking and mental arithmetic stressors显示文摘 | Al' Absi M Bongard S Buchanan T | 1997 | Psychophysiology1997，，34： | 1 |
| 11 | Computer generated graphite pencil rendering of 3D polygonal models显示文摘 | Sousa M C Buchanan J W | 1999 | Computer Graphics Forum1999，18，3： | 1 |
| 12 | Ca^2+ store depletion causes STIM1 to accumulate in ER regions closely associated with the plasma membrane 显示文摘 | Wu M M Buchanan J Luik R M | 2006 | J Cell Biol2006，174，6： | 1 |
| 13 | Computer-generated graphite pencil rendering of 3D polygonal models显示文摘 | J W Buchanan | 1999 | Computer Graphics Forum1999，18，3： | 1 |
| 14 | Primary vaginal melanoma Thirteen -year disease-free survival after wide local excision and review of recent literature显示文摘 | Dennis J Buchanan M D John Schlaerth M D | 1998 | Am Obstet Gynecol1998，178，3： | 1 |
| 15 | Ovine microsatellites at the Oar FCBll ,Oar FCB128 ,Oar FCB193,0arFCB266 and OarFCB304 Loci 显示文摘 | Buchanan F C Crraford A M | 1993 | Animal Genetics1993，24，： | 1 |
| 16 | Computer generated graphite pencil rendering of 3D polygonal models 显示文摘 | Sousa M C Buchanan J W | 1999 | Computer Graphics Forum1999，18，3： | 1 |
| 17 | Preparation of n- monoalkyl maleates and n-mono- and dialkyl fumarates 显示文摘 | Dymicky M Buchanan R L | 1985 | Organic Preparations and Procedures Internotional1985，17，2： | 1 |
| 18 | Preliminary evaluation of an Immunochomatographic strip test for specific treponema pallidum anti- bodies显示文摘 | Zarakolu P Buchanan I Tam M | 2002 | Clin Microbiol2002，8，： | 1 |
| 19 | Use of near-infrared spectroscopy to evaluate an active in a film coated tablet显示文摘 | Buchanan B R Baxter M A Chen T S | 1996 | Pharmacol Res1996，13，4： | 1 |
| 20 | Ambrosia beetle Xylosandrus germanus transmits Dutch elm disease under controlled conditions显示文摘 | BUCHANAN M D | 1940 | J Econ Entomol1940，33，： | 1 |
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