JAMA Cardiol:左室射血分数<30%的低流量、低梯度主动脉瓣狭窄患者的TAVR结局

2018-12-20 xiangting MedSci原创

无论左室功能障碍的严重程度和DSE结果如何,这些结果均支持LFLG AS患者进行TAVR。

在低流量、低梯度主动脉瓣狭窄(LFLG AS)患者中,左心室功能障碍的严重程度仍然是评估主动脉瓣置换的关键因素。

这项研究旨在评价严重左室功能不全的LFLG AS患者经导管主动脉瓣置换术(TAVR)后左室射血分数(LVEF)的变化和临床结局。

这个多中心登记是真实或虚假严重主动脉瓣狭窄-TAVI登记的亚组研究,纳入典型LFLG AS患者,LFLG AS定义为平均跨瓣梯度小于35mmHg、有效瓣口面积小于1.0cm2并且LVEF≤40%。将患者分为极低LVEF组(<30%)和低LVEF组(30%-40%)。极低LVEF组在TAVR前进行多巴酚丁胺负荷超声心动图(DSE),存在收缩性储备定义为每搏输出量增加20%或更多。在1个月、12个月和此后每年对临床结局进行评估,1年随访时进行超声心动图检查。回顾性数据来自2007年至2013年,前瞻性数据来自2013年1月至2018年3月。于2018年3月至10月进行数据分析。治疗:LFLG AS患者接受经导管主动脉瓣置换术

主要结局和指标: LVEF随时间的变化;围手术期和晚期死亡率。

共纳入293例患者,其中128例(43.7%)LVEF极低,165例LVEF低(56.3%)。平均(SD)年龄为80(7)岁,大多数(214 [73.0%])是男性。极低LVEF组的平均(SD)LVEF为22%(5%),低LVEF组为37%(7%)(P<.001)。组间的围手术期死亡率和晚期死亡率无差异(中位数[四分位范围],23 [6-38]个月)。1年随访检查时,LVEF极低组患者的LVEF升高值(平均绝对升高,11.9%[95%CI,8.8%-15.1%])大于低LVEF组(3.6%[95%CI,1.1%-6.1%]; P<.001)。术前进行DSE的92例极低LVEF患者中,结果显示45例(49%)缺乏收缩性储备,但这对临床结局或LVEF随时间的变化没有影响。

对于严重左室功能不全的LFLG AS患者,TAVR与左室功能不全较轻患者相似的临床结局相关。无论收缩性储备如何,TAVR都与LVEF显著升高相关。无论左室功能障碍的严重程度和DSE结果如何,这些结果均支持LFLG AS患者进行TAVR。

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