Radiology:心脏MRI测量的右心室功能在植入式心律转复器患者评估中的价值

2021-08-24 shaosai MedSci原创

植入式心律转复除颤器(ICD)是一项对有心脏猝死风险的患者进行一级和二级预防的成熟疗法。随机对照试验表明,植入ICD有利于降低左心室功能障碍患者和心脏骤停患者的死亡率。

植入式心律转复除颤器(ICD)是一项对有心脏猝死风险的患者进行一级和二级预防的成熟疗法。随机对照试验表明,植入ICD有利于降低左心室功能障碍患者和心脏骤停患者的死亡率。在一级预防方面,当代国际指南定义植入ICD候选者左心室功能障碍标准为左心室射血分数(LVEF)小于35%。相比之下,只有约三分之一因左心室功能障碍而有心脏猝死风险的患者符合基于左心室功能障碍的ICD植入标准只有少数人接受了适当的ICD 治疗。因此,有必要进行更多和更精细的风险评估,以改善对ICD植入患者的筛选流程

心脏MRI是测量右心室(RV)容积和功能的参考标准成像方式。大量的证据表明,RVEF是一个强有力的患者死亡独立预测因子,对缺血性和非缺血性心肌病及心力衰竭患者的风险分层意义重大。然而,关于RV功能障碍与心律失常事件关系的相关研究十分有限

近日,发表在Radiology杂志的一项研究探讨了应用心脏MRI测量的RVEF对为一级或二级预防心脏猝死而植入ICD的患者进行休克和死亡风险分层中的价值ICD候选者的筛选及临床诊治流程的规范提供了影像学支持

本项研究2007年1月至2017年5月期间植入ICD前接受心脏MRI的患者进行了评估用心脏MRI测量右心室舒张末期和收缩末期容积和RVEF。主要终点是全因死亡率或适当的ICD冲击的综合。次要点是全因死亡率。RVEF与主要和次要结果之间的关系是通过多变量的Cox回归分析来评估的。对一级预防、缺血原因、左心室射血分数(LVEF)和RVEF之间潜在的相互作用进行了测试。

在411名患者(平均年龄±标准差,60岁;315名男性)中,在63个月的中位随访期间,143名(35%)患者经历了适当的ICD休克或死亡。在单变量分析中,较低的RVEF与适当的ICD冲击或死亡以及单独死亡的风险有关(对数等级趋势测试,P=0.003和0.005)。在调整了植入ICD时的年龄、LVEF、ICD指征(主要与次要)、缺血性心脏病和晚期钆增强的多变量Cox回归分析中,RVEF是主要结果(危险比[HR],RVEF每降低10%为1.21;95%CI:1.04,1.41;P=0.01)和全因死亡率(HR,RVEF每降低10%为1.25;95%CI:1.01,1.55;P=0.04)的独立预测因素。没有发现RVEF与一级或二级预防(HR,1.11±0.17[标准差];P=.49)、缺血性心脏病(HR,1.02±0.15;P=.78)和LVEF(HR,0.91±0.8;P=.29)之间有明显相互作用的证据。

 

 60岁男性,已知有非缺血性心肌病史短轴稳态自由运动心脏MRI图像。图像在舒张期(左)和收缩期(右)获得,以计算右心室容积和射血分数。患者存在中度的房室收缩功能障碍(房室射血分数,34%)和严重的左心室收缩功能障碍(左心室射血分数,31%)。患者接受了植入式心律转复除颤器(ICD)的一级预防植入,在植入4年后接受了一次适当的ICD电击,并在植入5年后死亡。

本研究表明,在接受植入式心律转复除颤器(ICD)用于一级和二级预防心脏猝死的患者中,用心脏MRI测量的右心室射血分数(RVEF)是预测适当ICD休克和全因死亡率的独立指标。这些发现支持在心脏MRI上评估RVEF以改善ICD植入的风险分层

原文出处

Laura Jimenez-Juan,Nissan Ben-Dov,Caio V Goncalves Frazao,et al.Right Ventricular Function at Cardiac MRI Predicts Cardiovascular Events in Patients with an Implantable Cardioverter-Defibrillator.DOI:10.1148/radiol.2021210246

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    2022-06-24 villahu
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    2021-08-26 xfpan13
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    2021-08-26 jiyangfei
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    2021-08-26 未来将来

    MR对心脏的诊断还是有点难度的

    0

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    2021-08-24 仓央嘉措

    我们一般不做mri

    0

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现阶段,心脏MRI已被认为是无创评估心室容积和功能的最佳参考标准。通常情况下,临床上通过使用多次屏气获得多切面的二维cine bSSFP短轴采集以减轻呼吸运动所带来的的伪影。

Eur Radiol:成人Ⅱ型房间隔缺损患者的长期心脏适应性对右心室收缩功能有何影响呢?

CMR可在无辐射的情况下准确且可重复的评价心室容积和功能。CMR可以直接通过缺损或通过肺干和升主动脉前向体积之间的差异间接计算分流体积。在CMR电影成像上可以计算左心室和右心室心肌的张力。