简介:院波特竞争理论以市场结构化为背景,以S-C-P分析范式为支撑,它开创了战略研究的经济学视角,提供了五力模型、通用战略和价值链等战略管理概念、工具和具体建议。但波特竞争理论分析方法和工具本身的局限性使其具有因素同质化、竞争优势外生、战略目标单一、过分关注产品竞争、忽视合作和企业家才能等缺陷;而其深刻的市场结构化烙印则导致了其与当今个性化、知识化和信息化市场的不匹配。波特后期的竞争理论是对其前期理论的自我完善和整合,而其他主流竞争理论对波特竞争理论的完善和超越对现代战略管理极具启示意义。
简介:Aim:Tostudytheadvantageofexcisionofthedistalsymptomaticuretericstumpswiththeretroperitoneallaparoscopicapproach.Methods:Fourpatientswhohadfailedtosettletheirsymptomswiththeinitialconservativemanagementwereincludedinthestudy.Allunderwentexcisionofthedistalsymptomaticuretericstumpswiththeretroperitoneallaparoscopicapproachandthenreceivedprophylacticantibiotics.Results:Wehaveachievedbetterresultsthanthosereportedintheliteratureintermsofoperatingtime(mean1h45min),bloodloss(<10mL),postoperativerecovery(within12h)andhospitalstay(<48h).Conclusion:Retroperitoneallaparoscopicexcisionisasafe,simpleandeffectivemethodinthemanagementofsymptomaticuretericstumps.
简介:Hypertensionisaleadingriskfactorforcardiovasculardisease,theleadingcauseofdeathandmorbidityinoursocietyandonaglobalscale.Majorcomponentsofcardiovasculardiseaseincludestroke,coronaryarterydisease,heartfailure,andchronickidneydisease,inallofwhichhypertensionplaysamajorrole.Theriskofthesecomplicationsincreasesdirectlyandlinearlywithsystolicbloodpressurestartingat115mmHg.Althoughusuallyasymptomatic,hypertensionisreadilydetectableonphysicalexaminationandisamenabletobothlifestylemodificationandpharmacologictreatmentinmostpatients.However,largeproportionsofthehypertensivepopulationremainundetectedandundertreated.Numerousguidelineshavebeenissuedduringthepastfewdecadestopromotedetectionandoptimaltherapy.Despitetheincreaseinriskwithsystolicbloodpressuregreaterthan115mmHg,thegenerallyacceptedthresholdfordiagnosisandtreatmenthasbeensystolicbloodpressuregreaterthan139mmHganddiastolicbloodpressuregreaterthan80mmHgbecauseuntilrecentlytreatmenttolowerlevelshasbeenassociatedwithanunfavorablerelationbetweenclinicalbenefitandharm.Inthepastseveralyears,newguidelines,advisories,commentaries,andclinicaltrialshaveprovidedevidenceforapotentialchangeincurrentrecommendationsforthemanagementofhypertension.Inthisregard,thelong-awaitedeighthreportoftheJointNationalCommitteeonthePrevention,Detection,Evaluation,andTreatmentofHighBloodPressurerecommendedpatientsolderthan60yearsbetreatedtoasystolicbloodpressureoflessthan150mmHg,whichhasgeneratedconsiderablecontroversyandcaution.ThestrikingfindingsoftheSystolicBloodPressureInterventionTrial(SPRINT)havereceivedconsiderableattentionbecauseofthedemonstrationthatintensivetherapytoatargetsystolicbloodpressurebelow120mmHgdecreasescardiovascularmortalityandmorbiditymorethanlessintensivetreatmenttoatargetsystolicbloodpressurebelow140mmHg
简介:Dizzinessaffectsaleutone-thirdofindividualsovertheageof65years,andisoneofthemostconmlonreasonsfortheelderlytoconsulttheirgeneralpractitioner.Syncopeaffectsatleast20%ofthepopulationatmlnetimeandaccountsforabout6%ofgeneralmedicaladmissionsintheUK.Recurrentsymptomsareparticulas-lydisablingbecausetheyaffectanindividual'sabilitytoworkandtodrive,increasesusceptibilitytofallsandassociateinju-rim,andreduceindependenceintheelderly.
简介:Objective:Tosummarizesurgicaltreatmentsandtheircorrespondingcurativeeffectsonsciaticnerveinjuries.Methods:Surgicaltreatmentsonsciaticnerveinjurywereperformedin28patientsfromJanuary1990toJuly2000.Thetreatmentsincludedneurolysis,neurolysispluspartialnerveanastomosis,nerveanastomosisandnervetransplantation.ThecurativeeffectwasevaluatedaccordingtoSunderlandcriteria.Results:Of28cases,22patientswerefollowedupwithafollow-upperiodof13monthsto5years(average30months).Of22nerves,7wereexcellent,5good,7fairand3poor,withanexcellencerateof54.5%.
简介:Thispaperreviewscurrentrecommendationsontheappropriateevaluationandmanagementofcardiacarrhythmiasinthepregnantpatient.Mostarrhythmiasduringpregnancyarebenignandrequirenointervention.Whenrequired,thedecisiontotreatshouldbebasedonsymptomseverityandtheassociatedrisktomotherandfetusposedbypotentiallyrecurringarrhythmiaepisodesthroughoutthepregnancy.Anytreatmentstrategyinthispatientpopulationhasinherentrisktobothmotherandunbornchild.Beforetheinitiationofanyintervention,documentationofaclinicalarrhythmiaandcorrelationwithclinicalsymptomsshouldbeobtained.Thereisnoroleforempirictherapy.