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: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:Bothendotheliallipasegene(LIPG)584C>T(rs2000813)polymorphismandalcoholconsumptionmodulateserumlipidlevels.Buttheirinteractionsonserumlipidprofilesarenotwellknown.ThepresentstudywasundertakentodetecttheinteractionsofLIPG584C>Tpolymorphismandalcoholconsumptiononserumlipidlevels.GenotypingoftheLIPG584C>Twasperformedin763nondrinkersand520drinkersaged15-85.Interactionsbetweenthegenotypesandalcoholconsumptionwereassessedbyusingacross-productterm.Thelevelsofserumtotalcholesterol(TC),triglyceride(TG),high-densitylipoproteincholesterol(HDL-C),apolipoprotein(Apo)AI,andtheratioofApoAItoApoBwerehigherindrinkersthaninnondrinkers(P<0.01forall).Therewasnosignificantdifferenceinthegenotypicandallelicfrequenciesbetweennondrinkersanddrinkers.ThelevelsofserumTC,HDL-CandApoAIinnondrinkersweredifferentamongthethreegenotypes(P<.05-.01).ThesubjectswithCTgenotypehadhigherserumTC,HDL-CandApoAIlevelsthanthesubjectswithCCgenotype.ThelevelsofserumHDL-CandApoAIindrinkersweredifferentamongthethreegenotypes(P<.001andP<.05;respectively).TheindividualswithTTgenotypehadhigherserumHDL-CandApoAIlevelsthantheindividualswithCCandCTgenotypes.ThelevelsofTCinnondrinkerswerecorrelatedwithLIPG584C>Tallele(P<.05),whereasthelevelsofTGandHDL-CwereassociatedwithLIPG584C>Talleles(P<.05)andgenotypes(P<.05);respectively.ThepresentstudysuggeststhatthesubjectswithTTgenotypebenefitedmorefromalcoholconsumptionthanthesubjectswithCTandTTgenotypesinincreasingserumHDL-CandApoAIlevels.
简介:患者女性,40岁。反复心悸晕厥20年再发1天入院。其父在20多岁时猝死。入院时查体:血压120/80mmHg,心率640:/分,律齐,未闻及杂音,入院后查心肌酶学CTnI均正常。查心电图(图1A)示:Q—T间期延长,为0.58s。入院后给予β受体阻断剂治疗,入院期间反复发作尖端扭转型室性心动过速(图1B)。给予利多卡因及电除颤治疗后稍稳定。临床诊断:家族性Q—T间期延长综合征。后患者反复发作室性心动过速。转上级医院行起搏器加上β受体阻断剂治疗。随访未再发作晕厥。
简介:目的探讨心电图活动平板试验(TET)阳性患者Q-T离散度(QTd)变化的意义。方法93例受试者根据TET分为阳性组(A组)38例,男/女=13/25,年龄55±8岁和阴性组(B组)55例,男/女=26/29,比较两组TET前后QTd、QTcd的变化。结果运动前QTd、QTcdA组分别为41±15ms和46±18ms,B组分别(38±14)ms和(46±16)ms,两组比较无显著差异。达次极量运动时A组QTd为(51±17)ms与运动前比较有显著性差异(P<0.05),QTcd为(79±28)ms,与运动前比较有非常显著性差异(P<0.01),B组QTd、QTcd分别为(37±16)ms和(51±19)ms,与运动前比较无显著性差异。两组运动后QTd、QTcd比较有非常显著性差异(P<0.01)。结论TET阳性与QTd之间有良好的临床相关性。可反映运动负荷造成的心肌缺血。