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JACC:3D心肌灌注磁共振显像预测CAD更佳

2012-08-02 邓涛 医心网

    2012年7月18日《美国心脏病学会杂志》(JACC)发表论文称,3D心肌灌注磁共振显像(MRI)可准确预测血流储备分数(FFR)测定的致缺血狭窄,冠心病患者无创诊断和危险分层具有可行性。伦敦国王学院的Sven Plein研究组检查了53例患者(平均63岁)3D心肌灌注MRI对比血管造影期间测量的FFR诊断血流受限冠脉狭窄的准确性。研究人群总发病率6

    2012年7月18日《美国心脏病学会杂志》(JACC)发表论文称,3D心肌灌注磁共振显像(MRI)可准确预测血流储备分数(FFR)测定的致缺血狭窄,冠心病患者无创诊断和危险分层具有可行性。伦敦国王学院的Sven Plein研究组检查了53例患者(平均63岁)3D心肌灌注MRI对比血管造影期间测量的FFR诊断血流受限冠脉狭窄的准确性。研究人群总发病率64%,159支冠脉中的64支进行了FFR测量,39支FFR<0.75。共47支血管有严重狭窄:24例单支血管病变、7例二支血管病变、3例三支血管病变。

       患者3D心脏MRI检查时间平均为51±4分钟/例,影像质量好。7例(13%)有心内膜下暗边相关伪影,8例(15%)有呼吸运动伪影,但影像总质量足以诊断疾病。MRI影像具有良好敏感性、特异性和阳性及阴性预测值,每例患者和每个区域诊断准确度分别是90.6%和88.1%。心脏MRI评估的杜克危险评分和缺血容量呈强相关(r=0.82; 95% CI:0.70~0.89)(P<0.0001)。“这项研究显示FFR和3D心肌灌注(心脏MRI)具有高度一致性。”Plein等人总结。

       之前几项研究包括新近的前瞻性CE-MARC试验(Clinical Evaluation of MAgnetic Resonance imaging in Coronary heart disease),发现MRI探查稳定性CAD比单光子发射计算机体层摄影(SPECT)更准确。但3D技术具备心脏MRI的优点,并能克服MRI的技术局限——不能提供完整心肌图像。“3D显像信噪比优于2D显像,所有数据都是一次性抓取,故图像都是相同心相的。”他们写道。

       这项研究用FFR而非造影作为评估病变血流动力学意义的参考标准,是一个新方面。3D灌注显像作为心脏MRI的新应用之一,“似乎越来越有用”Harbor-UCLA医学中心Matthew J. Budoff说,目前的研究“向正确的方向迈进了一步。”“这是一个非常积极的研究,尽管是规模小的单中心研究,但这种证实非常关键,尤其是对比金标准进行证实——血流储备分数是最好的金标准。”

       Budoff评论说,对于这类研究FFR是比造影更好的对比对象,因为它与血运重建的需要相关性好,“MR容易受非议,单中心研究都没有成功。多中心研究可以用更好的盲法、执行更严格。我认为下一步是在大型多中心试验重复这个研究,让大家真切地看到该技术的准确度。”在研究附随评论中,汉诺威医学院的Jens Vogel-Claussen医生也提出未来的研究需要验证该技术的可靠性,以及不同生产商设备的可用性。“以往已通过2D灌注显像MRI和PET检查缺血和非缺血心脏病,未来要研究定量3D MRI灌注测量心脏病的可行性和临床价值。”

     研究细节:所有受试者接受3T磁共振扫描仪检查,以3D扰相梯度回波序列显示灌注影像,压力灌注心脏MRI检查之后检查左心室10~12个短轴切面影像,15分钟后用相同浓度与体积的对比剂进行静态心肌灌注扫描。
 
 
 


 

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    2012-09-23 hbwxf
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