HRS2018|华伟教授带您看:心脏起搏领域全新临床研究

2018-05-20 中国医学科学院阜外医院 华伟教授 中国医学论坛报今日循环

当地时间5月9日-12日,第39届美国心律学会科学年会(HRS2018)在美国东部城市波士顿隆重召开,会上公布的Late-Breaking Clinical Trials一直是会议讨论的热点。中国医学科学院阜外医院华伟教授团队对首期公布的4项心脏起搏领域相关最新临床研究结果作一介绍。

当地时间5月9日-12日,第39届美国心律学会科学年会(HRS2018)在美国东部城市波士顿隆重召开,会上公布的Late-Breaking Clinical Trials一直是会议讨论的热点。中国医学科学院阜外医院华伟教授团队对首期公布的4项心脏起搏领域相关最新临床研究结果作一介绍。

PADIT研究    心律失常植入器械预防感染研究

植入器械感染是心律失常器械手术的并发症之一,通常需要移除所植入的器械,是电生理医生最不愿看到的结果。国外传统预防感染策略为术前静脉点滴头孢唑啉,但该抗生素只能覆盖30%以下器械感染相关的病原微生物。

因此有学者提出一种新的围术期强化预防感染策略,包括术前使用头孢唑啉联合万古霉素、术中杆菌肽囊袋清洗以及术后前两天口服头孢氨苄。PADIT研究旨在对比该强化预防策略是否优于传统策略。

该研究为一项随机交叉临床研究,共28个中心的19603例患者参与。根据感染风险程度将患者分为高危和低危两组,其中高危组(12842例)为囊袋二次手术的患者,如更换脉冲发生器、电极导线调整和升级CRT。研究主要设计如下:前两年为患者入组期,所有中心随机一种治疗方式,一年后交叉为另一种治疗方式。研究主要终点设定为高危患者一年内因器械感染住院。

最终9605例患者纳入传统预防组,另外9954例纳入强化预防组。结果显示,入组患者平均年龄为(72.0±13.1)岁,33.9%为女性,有心衰病史者高达40%。随访一年发现,传统组和强化组在器械装置感染住院发生率上无显著统计学差异(1.03% vs 0.78%, P=0.77)。研究者认为,两种植入器械预防感染策略无明显统计学差异,但指出因为低于40%的器械感染发生率限制了统计学效能。

PADIT研究是迄今为止最大的多中心随机交叉对比临床研究,为心律失常植入器械预防感染策略提供了新角度。

FIX-HF-5C研究  心脏收缩调节器在心衰中应用的确证性研究

心脏收缩调节器(CCM)是在心室正常除极后的有效不应期内发放高能量脉冲刺激,该刺激并不起搏心脏,仅提高心肌收缩力,适用于QRS不宽(QRS<130 ms)的顽固性心衰患者。既往CCM的随机对照研究包括FIX- HF-4(N=164,随机双盲)、FIX-HF-5可行性研究(N=50随机双盲)以及FIX-HF-5研究(N=428,随机)均得出心衰患者摄氧峰值(PVO2)较基线水平有不同程度升高。

而FIX-HF-5研究提示,对于左室射血分数(LVEF)在25-45%的轻到中度心衰患者,CCM获益更大。因此,FIX-HF-5C研究是一项针对LVEF 25%-45%心衰人群的确证性随机对照临床研究。

该研究纳入欧美28个中心的160例射血分数25%-45%的心衰患者,随机分入CCM组和对照组。主要有效性终点为植入后24周摄氧峰值(PVO2)的改善。主要安全性终点为脉冲发生器植入相关的并发症高于30%。次要有效性终点为明尼苏达生活质量评分改善。

随访结果显示,与基线相比,随访12月及24个月PVO2均有明显提高,24个月PVO2升高绝对值为0.94 mlO2/kg/min。另外,患者明尼苏达生活质量评价较对照组改善11分,NYHA升高1级以上的百分比也明显高于对照组,差异均有统计学意义。

安全性终点方面,试验组出现7例植入手术或脉冲发生器相关并发症,包括5例电极脱位、1例深静脉血栓形成以及1例患者出现脉冲发生器腐蚀、囊袋刺激以及囊袋调整等。主要安全性终点方面,相较于对照组,CCM组24个月心血管死亡以及心衰恶化再住院风险明显降低(P=0.036)。

因此研究者认为,对于NYHA III/IV级的症状性心衰患者,如果QRS<130 ms,LVEF 25%-45%,CCM可明显改善患者运动耐量和生活质量评分,降低心衰恶化住院风险。

对于QRS波不宽的心衰患者,CCM植入器械的装置备受期待,本研究提示CCM在此类病人上的临床获益令人鼓舞,但相较于CRT,CCM还需更多的循证依据。

ENHANCE CRT研究  靶向左室电极植入方法在non-LBBB患者中的应用

CRT通过将左室电极放置于侧静脉或侧后静脉,激动左室最延迟部位以解决双室的不同步收缩,其最佳适应证是合并完全性左束支传导阻滞(left bundle branch block, LBBB)的慢性心衰患者,而对于non-LBBB患者,研究显示多效果欠佳,推测这类患者左室激动最延迟的部位不同于LBBB患者。QLV定义为腔内图上QRS波起点左心室导线感知波最高峰的时间间距,有研究发现它能判断CRT导线是否接近左室激动最晚部位。因此,QLV方法或许有望解决non-LBBB反应性这个问题。

ENHANCE CRT研究是来自29个中心共248例患者参与的一项前瞻性随机双盲多中心临床研究。入选标准需满足:(1) 心电图为non-LBBB形态 (包括完全性右束支阻滞和室内阻滞);(2)QRS波≥120ms;(3)NYHA 分级III-IV级;(4)ICD或起搏器升级、起搏比例<10%以及CRT新植入;(5)接受植入CRT-D四级导线装置。主要排除标准为合并持续或永久性房颤的患者。符合标准的患者按2:1随机分入QLV组和传统植入对照组,均植入St Jude左室四级导线。主要终点设定为临床复合终点评分(clinical composite score, CCS)。

190例患者纳入最终分析(QLV组128例,对照组62例)。随访12个月结果显示,在CCS反应率上,QLV组为67.2%,对照组为72.6% (P=0.38);在心血管死亡率和心衰住院率上,两组分别为(3.9% vs 4.8%,16.4% vs 16.1%, P=0.94);而在术后6月和12月LVEF恢复上两组有统计学差异,QLV组分别为(5.5 ± 11.0%和5.8% ± 9.6%),而对照组为(5.0 ± 8.4%和5.5% ±11.0%)(两组P<0.001)。研究者认为,non-LBBB患者对CRT临床反应良好,QLV指导有CRT指征的non-LBBB患者植入左室电极能改善心功能,但在终点事件上与传统方式无差异。

尽管Enhance CRT研究的中性结果并不十分满意,但它首次探讨靶向电极植入方法在non-LBBB这类病人上的RCT临床应用。

PREVENTION OF SYNCOPE TRIAL III研究  有晕厥史和双束支阻滞的老年患者,推荐植入永久起搏器还是植入式心电监测器?

对于有双束支阻滞的老年患者,晕厥多与间断高度房室传导阻滞有关,但也存在一些其他情况,例如迷走神经性晕厥、直立性低血压等等。那么对于这类病人,植入永久起搏器还是植入式心电监测(ICM)能让病人获益更多?

PREVENTION OF SYNCOPE TRIAL III研究是一项多中心随机研究,入选标准需满足:(1)至少1次的晕厥史;(2)体表心电图存在双束支阻滞;(3)年龄≥50岁;(4)签署知情同意。而排除标准要求:(1)既往植入ICD、起搏器等器械;(2)有指南推荐的I类起搏适应证;(3)LVEF<35%;(4)有永久性起搏禁忌症;(5)肥厚型心肌病;(6)存在自发或诱导的持续性室速;(7)心梗史<3个月;(8)脑电图提示癫痫;(9)明确记录到其他晕厥原因。所有入选患者随机分入永久性起搏器治疗组和ICM组。研究主要终点设定为研究相关主要不良事件(major adverse study-related events, MASRE),包括晕厥、需介入治疗的症状性窦性心动过缓、需介入治疗的无症状性窦性心动过缓、急性或慢性植入装置并发症以及心血管死亡。

最终115例患者纳入分析(起搏器组57例,ICM组58例),平均随访33个月显示,晕厥发生率上起搏器组与ICM组并无显著统计学差异(27% vs 31%,P=0.5, Wilcoxon),但在无MASRE生存率上前者明显高于后者(63% vs 22%,P<0.001)。研究者认为,对于近期有晕厥史且心电图提示双束支阻滞的老年患者,永久性起搏器植入是更好的决策。

尽管该研究的阳性结果支持这类病人植入永久性起搏器,但也提出了一些思考,例如电生理检查对于这类病人的应用价值。因此,实际临床决策仍需综合评估考虑。

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    学习

    0

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    2018-05-22 ysjykql
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    2018-05-22 yfjms

    学习

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    2018-05-21 zb1235672

    好知识值得借鉴!

    0

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    2018-05-20 131****1460

    学习了受益匪浅

    0

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    2018-05-20 wzb521zf

    一起学习学习

    0

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