简介:摘要目的探讨低浓度罗哌卡因复合舒芬太尼应用于潜伏期腰-硬联合麻醉后自控镇痛对分娩的影响。方法已临产的初产妇90例,随之分为三组,30例初产妇宫口开大1-2.5cm时开始分娩镇痛作为A组(潜伏期组),30例初产妇宫口≥3cm时开始分娩镇痛作为B组(活跃期组),未行分娩镇痛30例作为C组,观察三组产程进展、催产素使用率、新生儿评分、产后出血及剖宫产率。结果A组催产素使用率与B组及C组相比有显著差异(P<0.05),但三组第一产程、第二产程、第三产程、新生儿评分、产后出血及剖宫产率均无显著差异(P>0.05)。结论低浓度罗哌卡因复合舒芬太尼应用于潜伏期自控镇痛对母儿均无明显影响,值得推广。
简介:目的:比较定量脑电图与中潜伏期听觉诱发电位在监测全麻状态下认知功能方面的可行性。方法:研究对象为10名健康志愿者,从0.2MAC开始,逐渐增加异氟醚吸入浓度,每个浓度平衡15分钟后,观察指令反应,qEEG,MLAEP的变化,于使指令反应消失该异氟醚浓度下进行内隐记忆的听刺激,停止吸入后1小时调查外显及内隐记忆情况。结果:中潜伏期听觉诱发电位(MLAEP)中的Pa、Nb波随指令反应和记忆的变化而变化,并可确定外显记忆消失的各波潜伏期界值,随着外显记忆的消失,qEEGF7、F8、A1导联q波相对功率明显降低(P<0.05);随着指令反应的消失,O1及O2导联的a波相对功率明显降低(P<0.05),O2导联d波功率明显升高(P<0.05),但所有qEEG参数变异较大,不能定出界值。结论:(1)MLAEP中的Pa波,Nb波在判断全麻下认知功能方面有重要价值,并可确定出外显及内隐记忆消失的各波潜伏期界值,(2)qEEG在判断麻醉状态下认知功能方面只能作为一种趋势的预示,不能作为可靠的定量指标。
简介:Inthispaper,itisprovedthat,given3controlpointsA,BandC,ifthecamera'sopticalcenterOliesononeofthethreeplanesperpendiculartotheplaneABCandgoingthroughoneofthethreealtitudesofthetriangleABC,andadditionallyitsprojectionontheplaneABCiswithinthecircumscribedcircleofthetriangle,thatis,Oiswithintheso-called'dangercylinder',thenthecorrespondingP3Pproblem{O,(ABC)}musthave4positivesolutions.Thisresultispurelygeometrical,andmoreinstructive.Itcanbringsomenewinsightintoabetterunderstandingofmultiple-solutionprobleminthePnPproblem,andcouldbeusedassometheoreticalguidetoarrangecontrolpointsinrealapplications.
简介:1IntroductionTherareearthcobaltalloyshavethepotentialformakingthemagneticandmagnetoopticalmaterials.Sofar,therareearthcobaltalloyfilmsaresubstantiallyproducedbysputteringorvacuumplating.Ifsuchfilmsarepreparedbyelectrodepositioninstead,productionefficiencywouldbeimprovedandthecompositionofthealloycouldbecontrolled.Becausetheoxidationreductionpotentialsofrareearthelementsareverynegative,organicsolventsmaybeusedaselectrolyticmedia.ElectrodepositionofGdCoandSmCoinorganicsolutionshasbeenreporte...
简介:Thecopolymerizationofp-diethynylbenzene(PDEB)withphenylacetylene(PhA),4,4’-diethynylbiphenyl(DEBP)orm-diethynylbenzene(MDEB)arestudiedbyvaryingmoleratiosofmonomers.WhenthemoleratiosofPDEB/PhAarelessorequalto1/5,thecopolymersaresolubleandfusible,buttheothercopolymersareinsolubleandinfusible.Theresultsshowthatthegoodsolventofcross-linkedcopolymersisbenzeneandtheirsolubilityparameteris9.15cal0.5.cm(-1.5).Andtheirswellability(θp),Hugginsparameter(χ),density(d425)andtheaveragemolecularweightsbetweencrosslinks(c)aremeasured.Itisfoundthatθpandcofcopolymersaregreaterbutd425islessthanthatofrespectivehomopolymers.IRspectrashowthatthecopolymershavetransoidconfigurationandsmallnumberofunreactedethynylgroupsexistinthecopolymers.Themechanismaboutthepolymerizationoracetylenicderivativesinitiatedby(Ph3P)2PdCl2isdiscussed.