简介:患者男,25岁.因反复阵发性心悸、头晕就诊.T36.8℃,P92次/min,BP110/70mmHg.心肺体征(-).临床诊断:阵发性室上性心动过速.阵发性心悸发作时,心动过速呈突发突止特点.图为V1导联:P波直立,为异位P波.p-P及R-R间期呈长短交替,分别为0.42s及0.35s,互差0.07s,平均0.385s,频率156次/min.R-P间期固定.为起源于交接区心动过速.QRS波呈rsr'型.P及R形态一致.上述现象为交接区异位起搏点分别经快、慢2条径路同步、传导速度比例恒定(R-P间期恒定)的顺传、逆传所致(见梯形图).P-及R波形态一致,系2条径路分别到达心室及心房前,均经共同通道到达心室及心房之故.
简介:T1mappingusingcardiovascularmagneticresonance(CMR)introducesnoveltechniquesformyocardialtissuecharacterizationtodetectandquantifydiseaseprocessesoccurringatthemicroscopiclevel.EventhoughT1mappinghaslimitedspatialresolution,cellularandmolecularchangesoccurringwithineachvoxelcanaffecttheaggregateT1signalrenderingthemquantifiable.TheestimatedT1-basedparametersquantifiedona“map”demonstratethespatiallocalizationofthesechangeswherebyeachpixelexpressesthequantitativevalueofthatparameter.Thisquantificationpermitsdetectionofdiffusediseaseevenifitisnotdirectlyvisible.Ratherthanrelyingonnonspecificfunctionalmeasures,T1mappingfocusesonintrinsicchangesofmyocardialcompositionthatadvancesunderstandingaboutspecificdiseasepathways.Thesechangesinmyocardialtissuecompositioninformdiagnosisandprognosis.T1mappingencompassestwokeyparameters:native(i.e.,precontrast)T1andextracellularvolumefraction(ECV)derivedfromadditionalpostcontrastT1andbloodT1measurements.Theseadvancesintroducenewtoolstodetectfocalanddiffusemyocardialderangementsoccurringincardiacdiseasethatcanbeotherwisedifficulttodetect.T1andECVmappingfosterprecisionmedicineandpersonalizedcare,promisingtoimprovepatientoutcomesthroughtargetedtherapy.CapitalizingontheopportunitiesintroducedbyT1mappingandECVrequiresfurtherinvestigation.
简介:目的探讨ST—T改变的鉴别方法及诊断意义。方法对210例患者除作心电图(ECG)外井做血生化(血脂、血糖、肝肾功能、心肌酶谱、甲状腺功能测定系列等)、超声心动图、心脏X线等检查,随机抽取54例行试验性治疗,即给予50%G.S250ml加复方丹参注射液20ml,生脉注射液100ml均1/d,10d。再规律休息1w后对比治疗前后ECG。结果54例治疗前后ECG比较无明显变化,并随访3—12个月无一例发生心脏事件,随机抽取32例ECG并做多帧前后比较差异无统计学意叉。结论本组病倒经临床检查排除药物影响、器质性心脏病及继发性心脏病。试验性治疗ST—T无改变,提示此组人群中ST—T改变为非特异性的。
简介:Objectives:Apoptosisisrecognizedasanimportantmechanismincontrast-inducednephropathy(CIN).Cordycepssinensis(CS),atime-honoredtonicfoodandherbalmedicineinChina,canimprovethemicrocirculation,increasethetolerancetoischemiainpatientswithmicrocirculatorydisorders.AsCShasbeenfoundtoberenoprotectiveandanti-apoptoticinmultiplekidneyinjuries,wehypothesizedthatCSwouldpreventCIN.TheobjectiveofthisresearchistostudythemechanismofCSontubularepithelialcellapoptosisindiabeticCINrats.
简介:目的研究妊娠中晚期心电图短P—R间期产生机制以及对胎儿的影响。方法对32例妊娠中晚期发现短P—R间期者(观察组)和30例P—R间期正常的中晚期孕妇(对照组)进行24h动态心电图(DCG)及胎儿心电图(FECG)检查;对观察组进行输氧一周后复查常规心电图(ECG)、FECG、及产后3个月复查ECG。结果观察组心率变异(HRV)较正常对照组明显降低,有显著性差异(P〈0.001、P〈0.005及P〈0.01);观察组输氧后短P—R间期恢复正常,FECG前后变化不大。结论妊娠中晚期的P—R间期缩短与需氧量增加、自主神经功能失调、交感神经占优势相关.可作为中晚期妊娠者自主神经功能失衡的客观指标;对胎儿影响不大。
简介:目的探讨3.0TMR心肌灌注成像(MRmyocardialperfusionimagingMRMPI)检查技术应用及方法。方法对25例冠脉CTA确诊的冠心病患者行MR首过心肌灌注、延迟增强成像,经两位高年资医师以双盲法对图像质量进行评价分析。结果21例图像质量达到诊断要求,21例受检者狭窄度≥50%的冠脉共34支中,29支显示首过灌注减低,9支显示延迟增强,其中心肌透壁增强4例,非透壁增强5例。4例图像质量不能达到诊断要求。结论在控制好受检者心率及呼吸,掌控好技术要点的情况下,MR心肌灌注成像完全可以得到符合诊断要求的图像,有效评价心肌缺血情况及程度,为冠心病的临床诊断及合理治疗提供可靠的依据。
简介:目的分析心向量图T环形态改变,探讨T环改变对冠心病的诊断价值。方法对心电图ST-T正常的45例冠心病(A组)与45例健康者(B组)做VCG检查,分析额面(F面)、右侧面(SR面)、横面(H面)T环形态改变。将T环形态改变分为8种类型,仅1种改变为单纯型,2种或2种以上改变为复合型。结果A组9例呈单纯型,36例呈复合型。其中T环运转相反(46.7%)、T环长/宽值缩小(33.3%)、QRS/T值增大(33.3%)、T环振幅过大(17.8%)、QRS-T夹角增大、畸形T环(11.1%)呈单纯型与复合型2种形式;T环双支对称(17.8%)、线型T环(15.6%)仅呈复合型。B组有8例呈单纯型T环改变,余37例T环形态正常。其中QRS/T值增大(2.2%)、T环振幅过大(6.7%)、QRS-T夹角增大(8.9%)与A组差异分别为P<0.01、P>0.05、P>0.05。后2种虽然与冠心病组差异不显著,但属正常变异。B组其它类型改变均无。P<0.01。结论心向量图T环形态改变对冠心病正常心电图患者心肌缺血的诊断有重要价值。
简介:BackgroundInthisstudy,weaimedtoevaluatetheimpactofabnormalglucose,lipidandCystatin-ConthevirtualPvectorcharacteristics,whichhaven’tbeenreportedinpreviousstudies.Methods204ofnon-diabetesmellitus(NDM),130ofDM(type2)and39ofimpairedglucosetolerance(IGT)patientswereconsecutivelyandretrospectivelyrecruited.Weselectedaone-minutelengthofelectrocardiogramat4AMforanalysis.Afteraseriesofcalculatingalgorisms,weobtainedthevirtualplanarPvectorparameters.ResultsTherewerenosignificantdifferencesinFPV,FPA,RSPV,RSPA,HPVandHPAgroups.Afteradjustingconfoundingfactors,theregressioncoefficients(RC)wereestimatedasfollow:forFPV,femalegender(RC-0.21,P=0.02),triglyceride(RC-0.09,P<0.01),RVOT(RC0.03,P=0.02);forRSPV,femalegender(RC-0.21,P<0.01),triglyceride(RC-0.10,P<0.01),averageheartrate(RC0.01,P=0.02);forHPV,triglyceride(RC-0.08,P<0.001),LDL(RC-0.19,P<0.01),ApoB(RC0.67,P<0.01);forRSPA,Btypeofblood(RC-22.06,P=0.02),Cystatin-C(RC-72.79,P=0.02),thicknessofinterventricularseptum(RC3.70,P=0.01).Cystatin-CwassuggestedasacurerelatedtoRSPA,andthecut-offpointwas1.6mg/L.TherewerenosignificantriskfactorsassociatedwithFPAandHPA.TherewasnodifferenceinvirtualPvectoramongDM,IGTandNDMgroups.ConclusionIncreasedlevelsoflipidandCystatin-CsignificantlyimpactthecharacteristicsofvirtualPvector,whereasglucosedoesnot.Thesechangesmaycomefromahigherlowvoltageatrialareaandabnormalorientationofatrialdepolarization.