阵发性交感神经兴奋

阵发性交感神经兴奋WHATISPSHPSH：ParoxysmalSympatheticHyperactivityParoxysmal：阵发性SympatheticHyperactivity：交感活性增高WHATISPSH交感神经副交感神经WHATISPSH交感神经兴奋是一种应激反应，起到一定的机体保护作用WHATISPSH交感兴奋时可有以下变化：心率加快胃肠道血管收缩呼吸增快汗腺分泌瞳孔扩大糖原分解膀胱逼尿肌松弛、括约肌收缩肌张力升高！准备战斗！WHATISPSHWHATISPSH平衡是机体正常的生理需求交感VS副交感WHATISPSHPSH：unbalancedsympatheticsurgescausinghyperthermiadiaphoresistachycardiahypertensiontachypneadystonicposturingdevelopabruptlyandlastforashorttimeWHATISPSHWHATISPSHcharacteristic：Thefirstepisodeoccurredonaverage5.9±3.7daysafterbraininjuryThedurationofeachepisodewasonaverage31min(range,15–50min)anditsfrequencywasonaverage5.6/day(range,3―8/day)Only20%ofpatientswhowerefollowedupat12monthsafterinjuryshowedcontinuedsignsofPSHYoungerageandmalegenderhavebeencitedasriskfactorsWHATISPSHcharacteristic：Increasesindopamine,adrenaline,andnoradrenalinelevelsduringtheepisodeshavebeenreportedPatientswhoexperiencePSHhaveworseGlasgowOutcomeScalescoresandworsefunctionalindependentmeasuresthantheirounterpartslongerICUstays,longerhospitalstay,moremechanicalventilationdays,moreinfectiousepisodes,moretracheostomy,andhigherhealthcarecostsWHATISPSHPSHoccursinstages：asymptomaticduetosedation;onsetofsymptomclusters;declineinposturinganddystoniaReasonforPSHCausedbyTBIsubarachnoidhemorrhageencephalitistumorshydrocephalusotherdiseasesMechanismsUnknownfunctionalorstructuraldisconnectionlesionsinthemesencephaloncausedisruptionsinrelayfromthemedulla/hypothalamusexcitatory–inhibitoryratio(EIR)modeldysfunctionofthediencephalic-brainsetminhibitorycenterthatnormallycontrolsafferentstimulusprocessinginthespinalcordoccursDiagnosticWorkupsExclusiondiagnosisInfectionsandsepsisshouldberuledoutinpatientswithfeverandtachycardiaOpiatewithdrawalfromprolongedsedationshouldbeaddressedEEGtoruleoutseizuresDiagnosticWorkupsCFS-AM量表特点得分临床症状同时发生1突发性1轻微刺激引起症状发作1发作症状持续≥3天1脑损伤持续大于≥周1其他治疗后症状无缓解1药物可缓解交感神经症状1发作≥2次/d1无副交感兴奋表现1排除其他原因1获得性脑损伤病史1不可能(＜8分)，可能(8～16分)，很可能(＞17分)ManagementnodirecttreatmentoptionsareavailablecontrolofsymptomsMedicaltreatmentsforPSHincludeα2-agonists,β-blockers,benzodiazepines,dopamineagonists,opioids,GABAergicagents,antrolene,andgabapentin；ManagementClonidine(可乐定)：presynapticα2-receptoragonistwhichreducescentralsympatheticoutflowfromthehypothalamusandventrolateralmedullaDexmedetomidine（右美托咪定）:anintravenoussedativeandthefirstandonlycurrentlyapprovedintravenousα2-agonistManagementBaclofen（巴氯芬）:structuralanalogoftheinhibitoryneurotransmitterγ-minobutyricacid(GABA),indicatedfortreatmentofspasticityandtoimprovemobilityGabapentin（加巴喷丁）：analogofGABAManagementBromocriptine（溴隐亭）:syntheticdopamineagonistthatstimulatesdopaminetype2receptorsandantagonizestype1receptorsinthehypothalamusandtheneostriatumofthebrainDantrolene（丹曲林）:decreasesmusclecontractionbydirectlyinterferingwithcalciumionreleasefromthesarcoplasmicreticulumwithinskeletalmusclecells.ManagementPropranolol（普萘洛尔）:β-BlockersMorphine（吗啡）:μ-opioidreceptoragonist;startingwithintravenouslydministeredmorphineandthenswitchingtoascheduledoralrouteofadministrationofmorphineor