小兒麻醉對認(rèn)知的影響

CognitionandBrainStructure

FollowingEarlyChildhoodSurgery

WithAnesthesiaBaryniaBackeljauw

BS,CincinnatiChildren’sHospitalMedicalCenter

1ppt課件CognitionandBrainStructure

兒童期是敏感的神經(jīng)發(fā)育階段，由于麻醉藥能夠強(qiáng)烈的興奮或抑制神經(jīng)傳遞，因此麻醉藥能夠干擾神經(jīng)網(wǎng)絡(luò)發(fā)育，導(dǎo)致長期功能障礙。在動物幼體實驗中發(fā)現(xiàn)，麻醉后會出現(xiàn)神經(jīng)元缺失和長期的學(xué)習(xí)、記憶損傷等神經(jīng)認(rèn)知功能受損的情況前言2ppt課件兒童期是敏感的神經(jīng)發(fā)育階段，由于麻醉藥能夠強(qiáng)烈的興奮或抑制神精品資料精品資料你怎么稱呼老師？如果老師最后沒有總結(jié)一節(jié)課的重點的難點，你是否會認(rèn)為老師的教學(xué)方法需要改進(jìn)？你所經(jīng)歷的課堂，是講座式還是討論式？教師的教鞭“不怕太陽曬，也不怕那風(fēng)雨狂，只怕先生罵我笨，沒有學(xué)問無顏見爹娘……”“太陽當(dāng)空照，花兒對我笑，小鳥說早早早……”小兒麻醉對認(rèn)知的影響由于小兒特殊的生理和心理特點，麻醉是否會對其腦功能有所影響、麻醉藥是否影響其發(fā)育等一直以來都是麻醉科、兒科和神經(jīng)科醫(yī)生普遍關(guān)注的問題。雖然進(jìn)行了大量的研究，許多問題尚未清楚。5ppt課件由于小兒特殊的生理和心理特點，麻醉是否會對其腦功能有所影響、BackgroundAnestheticsinducewidespreadcelldeath,permanentneuronaldeletion,andabstractneurocognitiveimpairmentinimmatureanimals,raisingsubstantialconcernsaboutsimilareffectsoccurringinyoungchildren.6ppt課件BackgroundAnestheticsinducewBackgroundEpidemiologicstudieshavebeenunabletosufficientlyaddressthisconcern,inpartduetorelianceongroup-administeredachievementtests,inabilitytoassessbrainstructure,andlimitedcontrolforconfounders.7ppt課件BackgroundEpidemiologicstudieMethodsWecomparedhealthyparticipantsofalanguagedevelopmentstudyatage5to18yearswhohadundergonesurgerywithanesthesiabefore4yearsofage(n=53)withunexposedpeers(n=53)whowerematchedforage,gender,handedness,andsocioeconomicstatus.NeurocognitiveassessmentsincludedtheOralandWrittenLanguageScalesandtheWechslerIntelligenceScales(WAIS)orWISC,asappropriateforage.BrainstructuralcomparisonswereconductedbyusingT1-weightedMRIscans.8ppt課件MethodsWecomparedhealthypar方法9ppt課件方法9ppt課件ResultsAveragetestscoreswerewithinpopulationnorms,regardlessofsurgicalhistory.However,comparedwithcontrolsubjects,previouslyexposedchildrenscoredsignificantlylowerinlisteningcomprehensionandperformanceIQ.10ppt課件ResultsAveragetestscoreswer智力11ppt課件智力11ppt課件聽力理解能力12ppt課件聽力理解能力12ppt課件ResultsExposuredidnotleadtogrosseliminationofgraymatterinregionspreviouslyidentifiedasvulnerableinanimals.DecreasedperformanceIQandlanguagecomprehension,however,wereassociatedwithlowergraymatterdensityintheoccipitalcortexandcerebellum.13ppt課件ResultsExposuredidnotleadt14ppt課件14ppt課件ConclusionsThepresentfindingssuggestthatgeneralanesthesiaforasurgicalprocedureinearlychildhoodmaybeassociatedwithlong-termdiminutionoflanguageabilitiesandcognition,aswellasregionalvolumetricalterationsinbrainstructure.15ppt課件ConclusionsThepresentfindingConclusionsAlthoughcausationremainsunresolved,thesefindingsnonethelesswarrantadditionalresearchintothephenomenon’smechanismandmitigatingstrategies.16ppt課件ConclusionsAlthoughcausation17ppt課件17ppt課件為什么成年人和兒童早期接受麻醉后的影響差異很大？動物研究發(fā)現(xiàn)，未完全成熟的小腦神經(jīng)元易受麻醉藥物影響，而小腦結(jié)構(gòu)的損害可能與較低的IQ相關(guān)。討論18ppt課件為什么成年人和兒童早期接受麻醉后的影響差異很大？討論18pp動物實驗證明：全麻藥物可誘發(fā)神經(jīng)細(xì)胞凋亡，最終導(dǎo)致神經(jīng)系統(tǒng)功能損害19ppt課件動物實驗證明：全麻藥物可誘發(fā)神經(jīng)細(xì)胞凋亡，最終導(dǎo)致神經(jīng)系統(tǒng)功動物研究發(fā)現(xiàn)，未完全成熟的小腦神經(jīng)元易受麻醉藥物影響，而小腦結(jié)構(gòu)的損害可能與較低的IQ相關(guān)。20ppt課件動物研究發(fā)現(xiàn)，未完全成熟的小腦神經(jīng)元易受麻醉藥物影響，而小腦全麻藥觸發(fā)嚙齒類動物發(fā)育期大腦的神經(jīng)細(xì)胞凋亡，并致成年期的神經(jīng)功能缺陷，在人類發(fā)育期大腦全麻藥是否也能導(dǎo)致相似的神經(jīng)毒性？

21ppt課件全麻藥觸發(fā)嚙齒類動物發(fā)育期大腦的神經(jīng)細(xì)胞凋亡，并致成年期的神臨床上沒有足夠臨床資料和流行病學(xué)證據(jù)；麻醉后人腦神經(jīng)元凋亡的組織學(xué)證據(jù)也無法獲得（在實踐上和道德上是不可能的）Wilder等和Kallman等回顧性研究認(rèn)為4歲前接受麻醉藥，使用一種以上全麻藥和長時間暴露是導(dǎo)致學(xué)習(xí)能力減退的危險因素，其中2歲前暴露風(fēng)險較大22ppt課件臨床上沒有足夠臨床資料和流行病學(xué)證據(jù)；麻醉后人腦神經(jīng)元凋亡的23ppt課件23ppt課件并不能排除這些神經(jīng)認(rèn)知功能方面的異常是由圍手術(shù)期因素導(dǎo)致的，例如疼痛、炎癥反應(yīng)或一些遺傳相關(guān)的因素。

未能區(qū)分手術(shù)和麻醉各自本身的影響，也不能排除需要手術(shù)的患兒原發(fā)疾病更易發(fā)生學(xué)習(xí)能力減退的可能目前并沒有排除這些因素的干擾。討論-混雜因素24ppt課件并不能排除這些神經(jīng)認(rèn)知功能方面的異常是由圍手術(shù)期因素導(dǎo)致的，分析發(fā)現(xiàn)，對于本研究中絕大多數(shù)接受麻醉的孩子，各項量表的評分不僅在正常范圍內(nèi)，甚至有的還高于總體人群平均水平。因此，如果將這些孩子與總體人群比較，則顯示麻醉并沒有上述不良影響。討論-統(tǒng)計學(xué)25ppt課件分析發(fā)現(xiàn)，對于本研究中絕大多數(shù)接受麻醉的孩子，各項量表的評分Ourstudyhasseverallimitations.TheMRIdatausedinthisstudyarebetween8and11yearsold.Morecontemporaryimagingtechniquesmightprovidebetterresolutionandimprovedsensitivitytosubtlebrainvolumetricdifferences.Furthermore,thetimingbetweenthesurgicalprocedureandtheMRIscanandneurocognitiveassessmentvariedfromlessthan2to15yearsaftersurgery,whichcouldhavelimitedtheextentofthedetectablechangesduetobrainplasticityandrepair.Thestudy’ssamplesizewasrelativelysmall,andthetimeintervalsincetheoriginalstudymadeadequatefollow-updifficult.Moreover,studyparticipantswerevolunteeredbytheirparentsfortheinitiallanguageassessmentstudy,whichcouldaffectgeneralizabilityoftheresultstoabroaderpopulationbutdidnotinfluencethecomparisonsbetweenthe2studygroups,whichweredrawnfromthesamecohort.Astypicalforsurgeryininfantsandtoddlers,manychildreninourstudyunderwentsurgeryforchronicearinfections,whichcouldpotentiallyhaveinfluencedlanguagedevelopmentduetohearingimpairment26ppt課件OurstudyhasseverallimitatiConcernsforneurobehavioraldisordersandabnormalitiesinbrainfunctioncausedbyenvironmentalchemicalexposureduringearlybraindevelopmenthaverecentlybeenextendedtoanestheticsandsedatives,whichareadministeredtomillionsofyoungchildrenworldwide.1,16

Manysurgicalproceduresearlyinlifetreatlife-threateningconditions,avertserioushealthcomplications,orimprovequalityoflifeandthereforecannotbeeasilypostponedoravoided.Neurotoxiceffectsofallcommonlyusedanestheticsandsedativeshavenowbeenfoundinawidevarietyofanimalspecies,andpostexposurelearningimpairmentshavebeendocumentedinrodentsandnonhumanprimates.8,17Accordingly,thepresentstudyassessedtheeffectsofearlychildhoodanesthesiaforsurgeryonlong-termcognitivefunctionandbrainstructurebycomparingpreviouslyexposedchildren,whoseanesthesiarecordswerereviewed,vers