钝性胸部
创伤后
心功能障碍与心肌细胞内ATPase变化的关系
闵家新1朱佩芳2王正国2吴秋平1彭祖胜1
(1.第三军医大学附属新桥医院胸外科,重庆400037;
2.第三军医大学附属大坪医院野战外科研究所,重庆400042)
摘要:目的探讨心肌细胞内三磷酸腺苷酶(ATPase)的变化在钝性胸部创伤(BCT)后心功能障碍发生机制中的意义。方法采用随机数字表法将36只兔分为6组:正常对照组(创伤前),伤后2h、4h、8h、12h和24h组,每组6只。用BIMⅡ型生物撞击机建立BCT模型,经右颈总动脉插管至左心室测左室压力,在创伤后2h、4h、8h、12h和24h各时间点测定血流动力学指标和心肌匀浆组织、线粒体及胞浆内ATPase活性。结果与对照组比较,创伤后2h时2h组左心室收缩期末压(LVESP)、左心室内压最大上升速率(+dp/dtmax)、等容收缩压(IP)、实测心肌最大收缩速度(Vpm)明显下降(P<005),在伤后4~12h时4h组、8h组、12h组恢复至创伤前水平(P>0.05);等容舒张期左室内压下降时间常数(T)、左心室舒张期末压(LVEDP)、左室内压最大下降速率(-dp/dtmax)在伤后24h组与对照组比较差异有统计学意义(P<0.05,0.01)。伤后2h组、4h组心肌匀浆组织、线粒体及胞浆ATPase活性下降(P<0.05,001),分别至伤后8~12h时分别恢复至创伤前水平(P>0.05)。相关分析表明:LVEDP和-dp/dtmax与心肌匀浆组织Na+-K+-ATPase活性改变呈明显负相关(r=-0.674,-0.691,P<0.05),与Ca2+-ATPase活性改变呈明显负相关(r=-0.613,-0.642,P<0.05);与心肌细胞线粒体Na+-K+-ATPase活性改变呈明显负相关(r=-0.622,-0.616,P<0.05);与心肌细胞胞浆Ca2+-ATPase活性改变呈明显负相关(r=-0.672,-0.658,P<0.05),与心肌细胞胞浆Na+-K+-ATPase活性改变
呈明显负相关(r=-0.627,-0.632,P<005),与心肌细胞胞浆Mg2+-ATPase活性改变呈明显负相关(r=-0.677,-0.661,P<0.05)。结论BCT后左心室收缩/舒张功能受到损害,尤以舒张功能障碍为主,心肌细胞中ATPase活性下降可能是其原因之一。
关键词:创伤;钝性胸部创伤;心脏功能;三磷酸腺苷酶
〖HT5”H〗中图分类号:R654.2文献标识码:A文章编号:1007-4848(2009)02-0123-04
TheRelationshipBetweenCardiacDysfunctionandtheChangesofAdenosineTriphosphateEnzymeinMyocardialCellsafterBluntChestTrauma
MINJia-xin1,ZHUPei-fang2,WANGZheng-guo2,WUQiu-ping1,PENGZu-sheng1.(1.DepartmentofThoracicSurgery,XinqiaoHospital,theThirdMilitaryMedicalUniversity,Chongqing400037,P.R.China;2.ResearchInstituteofFieldSurgery,theThirdMilitaryMedicalUniversity,Chongqing400042,P.R.China)Correspondingauthor:ZHUPeifang,E-mail:mjx8@163.comAbstract:ObjectiveToinvestigatethechangesandrolesofmyocardialadenosinetriphosphateenzyme(ATPase)inthemechanismofcardiacdysfunctionafterbluntchesttrauma(BCT).MethodsThirtysixrabbitsweredividedinto6groupswithrandomnumbertable,controlgroup,2hgroup,4hgroup,8hgroup,12hgroupand24hgroup,6ineachgroup.ThemodelsofBCTwereestablishedwithBIMⅡbiologicalimpactmachine,catheterizationtechniquewasusedthroughtherightjugulararteryintotheleftventriclemeasureitspressure.ThehemodynamicsandtheactivitiesofATPaseinmyocardialcellplasm,homogenateandmitochondriaweremeasuredatpreinjury(controlgroup),2h,4h,8h,12hand24hpostinjury.ResultsLeftventricularendsystolicpressure(LVESP),themaximalascendingrateofleftintraventricularpressure(+dp/dtmax),isovolemecpressure(IP)andthemaximalphysiologicalvelocity(Vpm)decreasedsignificantlyat2hgroupafterBCT(P<0.05),andrecoveredtopreinjurylevelin4h,8hand12hgroupduring4-12hafterBCT;isovolumicrelaxationphaseleftventricularpressuredescendingtimeconstant(T).Leftventricularenddiastolicpressure(LVEDP)andthemaximaldescendingrateofleftintraventricularpressure(-dp/dtmax)weresignificantlyhigher(P<0.05,001).TheactivityofATPaseinhomogenate,mitochondriaandcellplasmdecreasedsignificantlyat2hgroupand4hgroupafterBCT(P<0.05,001,respectively),and8hgroupand12hgrouprecoveredafterBCT.Therewasnegativecorrelationsbetween[CM(159mm]LVEDPand-dp/dtmaxandthedecreaseoftheactivityofNa+-K+-ATPaseinhomogenate(r=-0.674,-0691,P<005),theCa2+-ATPaseinhomogenate(r=-0.613,-0.642,P<0.05),theNa+-K+-ATPaseinmitochondria(r=-0622,-0.616,P<0.05),theCa2+-ATPaseinmyocardialcellplasm(r=-0.672,-0.
658,P<005),theNa+-K+-ATPaseinmyocardialcellplasm(r=-0.627,-0.632,P<0.05),andtheMg2+-ATPaseinmyocardialcellplasm(r=-0.677,-0.661,P<0.05).ConclusionTheleftventricularfunctionisimpairedobviouslyafterBCT,especiallyindiastolicphase.ThedecreaseoftheactivityofATPaseinmyocardialcellsmaybeoneofthereasonsofcardiacdysfunctionafterBCT.
Keywords:Trauma;Bluntchesttrauma;Cardiacfunction;Adenosinetriphosphateenzyme
Foundationitem:NatureScienceFoundationofScienceCommitteeofChongqing(2006BB5073)