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JAMA:射血分数正常心衰:吸入无机亚硝酸盐可否改善运动能力?

2018-11-30 王淳 环球医学网

2018年11月,发表于《JAMA》上的一项随机临床试验,考察了无机亚硝酸vs安慰剂对射血分数正常心衰(HFpEF)患者的作用。

2018年11月,发表于《JAMA》上的一项随机临床试验,考察了无机亚硝酸vs安慰剂对射血分数正常心衰(HFpEF)患者的作用。

重要性:HFpEF的有效治疗较少。短期服用无机亚硝酸盐或硝酸盐制剂能改善一氧化氮信号,这可能改善HFpEF的有氧工作能力。

目的:考察4周雾化吸入无机亚硝酸盐对HFpEF锻炼能力的作用。

设计、地点和受试者:多中心、双盲、安慰剂对照、2种治疗方法的交叉试验,共纳入105名HFpEF患者。2016年7月22日到2017年9月12日间,从美国17家站点招募受试者,随访最后日期是2018年1月2日。

干预:通过微型雾化器给予无机亚硝酸盐或安慰剂。6周交叉研究期内,受试者先接受2周无研究药物期(基线/洗刷);随后1周接受研究药物(亚硝酸盐或安慰剂)46 mg,每日3次;接下来3周,80 mg,每日3次。

主要结局和测量指标:主要终点是氧耗峰值(mL/kg/min)。次要终点包括加速度计评估的每日活动水平、堪萨斯城市心肌病调查问卷评估的健康状况(评分范围,0~100分,较高评分反映较好的生活质量)、功能分级、超声心动图心脏充盈压力评估、前激素脑钠素N端片段水平、其他运动指标、不良事件和耐受性。治疗4周后对结局进行评估。

结果:在105名随机分配的患者(中位年龄,68岁;56%女性)中,98名(93%)完成试验。在亚硝酸盐期,平均峰值耗氧量同安慰剂期相比差异无统计学意义(13.5 vs 13.7 mL/kg/min;差值,-0.20[95%CI,-0.56~0.16];P=0.27)。治疗期间的每日活动水平(5497 vs 5503个加速度单位;差值,-15[95%CI,-264~234];P=0.91)、堪萨斯城市心肌病调查问卷临床总分(62.6 vs 61.9;差值,1.1[95%CI,-1.4~3.5];P=0.39)、功能分级(2.5 vs 2.5;差值,0.1[95%CI,-0.1~0.2];P=0.43)、超声心动图E/有比值(16.4 vs 16.6;差值,0.1[95%CI,-1.2~1.3];P=0.93)或前激素脑钠素N端片段水平(520 vs 533 pg/ml;差值,11[95%CI,-53~75];P=0.74)差异无统计学意义。亚硝酸盐期有3名受试者(2.9%)出现心衰加重,安慰剂期有8名(7.6%)。

结论和意义:在HFpEF患者中,同安慰剂相比,吸入无机亚硝酸盐4周没有明显改善其运动能力。

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    2019-10-12 paperyu
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目前,心衰的分级是根据患者的左室射血分数(LVEF)而定的,但其预后价值仍存在争议。心肌顺应性是独立于LVEF的一个心衰预后因素。本研究的目的旨在评估整体纵向应变(GLS)对心衰病人的预后价值。本研究纳入了4172名心衰病人,根据LVEF将其分成了LVEF减少组(LVEF <40%)、LVEF中等组(LVEF 40%-49%)和保留型LVEF组(LVEF ≥50%);同时,根据患者的GLS,

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