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: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:Arrhythmogenicrightventriculardysplasia/cardiomyopathy(ARVD/C)ischaracterizedbyfibro-fattyreplacementoftherightventricle.However,thefeasibilityandsignificanceofmyocardialfibrosisdetec-tedbydelayedenhancement(DE)using3.0Tmagneticresonanceimaging(MRI)in.ARVD/Cisseldomlystudied.MethodsTwenty-sevenconsecutivepatientswereprospectivelyevaluatedforARVD/C.Magneticreso-nanceimagingwasperformedona3.0Tscanner.Tenminutesafterintravenousadministrationof0.2mmol/kgofgadodiamide,DE-MRIwasobtained.DiagnosisofARVD/CwasbasedupontheTaskForcecriteriaandin-cludedMRIfindings.ResultsSeventeen(59%)of27patientsmettheTaskForcecriteriaforARVD/C.Rightven-tricleDEwasfoundinall(100%)ARVD/Cpatientscomparedwithnone(0%)ofthe10patientswithoutARVD/C(P<0.001).AdditionalleftventricularDEwasfoundin8/17ARVD/Cpatientswhilewithoutleftventricularmor-phologicalandfunctionalabnormalitiesdetectedbyechocardiographyorMRI.ConclusionsDEusing3.0TMRIcouldeffectivelydetectmyocardialfibrosisintherightandleftventricularmyocardiuminARVD/Cpatients.DetectionofmyocardialfibrosismayhaveanimportantclinicalsignificanceinARVD/Cdiagnosis.Histologicalleftventriclein-volvementmaybeeasilymissedbyechocardiography.
简介:患者,女,43岁.1998年11月26日以心慌、胸闷就诊.查体:心率53次/min,心律不齐,心界不大,血压120/90mmHg.因心律失常原因待查,作心电图检查.
简介:患者男性,88岁。3个月前动态心电图诊断为完全性右束支传导阻滞,二度(2:1)房室传导阻滞。此次突发晕厥再次行动态心电图检查(图1A)示:三度房室传导阻滞,缓慢心率35次/分,房室交接区逸搏心律伴完全性右束支传导阻滞,Q—T间期长达0.70s。动态心电图全程记录反复发作的多形性室性心动过速,长Q—T间期诱发尖端扭转型室性心动过速。最长持续时间29s伴短暂阿斯发作,自行终止(图1B)。次日患者发作频率增多,紧急安装临时心脏起搏器,未见阿斯发作,第三天改为永久性VVI心脏起搏器(图略)。
简介:目的探讨中国汉族人群谷胱甘肽硫转移酶(glutathioneS-transferases.GST)M1及T1基因(GSTMI/GSTFl)多态性与先天性心脏病(先心病)发病风险的关系。方法采用病例一对照研究(病例组365例,对照组372例),运用多重聚合酶链反应检测先心病患者及健康对照GSTM1/GSTT1基因型:并利用多因素非条件logistic回归模型,进行先心病发病风险影响因素关联强度及交互作用分析。结果GSTM1/GSTI'I基因多态性及研究对象母亲围孕期吸烟、饮酒、化学物质接触、孕前体质量指数、教育程度、定期产检以及怀孕知情时间在病例组和对照组之间分布存在明显差异(P〈O.05)。GSTM1/GSTT1基因缺失与先心病发病风险显著正相关(OR=1.56,P=0.049;OR=1.73,P=0.036)。经logistic回归分析,GSTM1(-)/GSTT1(-)基因型和研究对象母亲围孕期吸烟、饮酒、化学物质接触以及孕前高体质量指数是先心病发病的高危因素,研究对象母亲围孕期定期产检以及摄人充足的叶酸是先心病的保护因素。研究对象母亲围孕期吸烟与GSTM1(-)/GSTFl(-)基因型之间具有正相加交互作用。与母亲围孕期不吸烟且GSTM1/T1基因未缺失的研究对象相比,其母亲围孕期吸烟且携带GSTM1(-)和(或)GSqTl(-)基因型的先心病发病风险显著上升(OR=9.01,3.87,3.01;95%CI:1.73—39.69,1.21~19.57,1.13—9.69)。结论GSTM1/GSTY1基因缺失是先心病发病风险的独立危险因素;GSTM1(-)/GSTY1(-)基因型与孕母围孕期吸烟在先心病的发生中具有协同作用。
简介:目的探究心脏磁共振T1Mapping成像与细胞外容积(ECV)在评估扩张型心肌病(DCM)心肌纤维化中的应用.方法选取2015年11月~2017年3月于成都市第五人民医院放射科检查的63例DCM患者作为DCM,另选取52例健康者作为对照组,所有受试者均进行T1Mapping成像与延迟钆增强扫描,比较两组左心室质量指数、左室射血分数(LVEF)、左室舒张末期容积(LVEDV)、左室收缩末期容积(LVEDI)、每搏输出量、心率变化.根据DCM组患者是否出现延迟强化(LGE)分为LGE组与非LGE组,分别比较DCM组和对照组、LGE组和非LGE组的增强前T1值、增强后5min、15min、30min的T1值、细胞外容积(ECV)值.构建受试者工作特征(ROC)曲线,分析增强前TI、ΔTI、ECV区分DCM组与对照组的曲线下面积(AUC)并比较TI、ΔTI、ECV的诊断效能.结果DCM组左心室质量指数、LVEDV、LVEDI均高于对照组,LVEF、每博输出量均低于对照组,差异均有统计学意义(P〈0.05).两组患者心率比较差异无统计学意义(P〉0.05).DCM组增强前T1、增强后5min、15min、30minT1值、ECV值均高于对照组,差异有统计学意义(P〈0.05).DCM组中LGE组43例,非LGE组19例,LGE组增强前T1、增强后5minT、15min、30minT1、ECV均高于非LGE组,差异有统计学意义(P〈0.05).ROC曲线区分DCM组和对照组,ECV的AUC值高于ΔTI和增强前T1.增强前TI、ΔTI、ECV区分两组的敏感度、准确率对比,差异有统计学意义(P〈0.05).ECV敏感度、准确率高于增强前T1,差异有统计学意义(P〈0.05),ΔTI和ECV敏感度、准确率对比,差异无统计学意义(P〉0.05).结论心脏磁共振T1Mapping和ECV技术在评估均DCM心肌纤维化中具有较高的应用价值.