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JACC:硝普钠会对LGSAS和保留EF患者产生哪些影响?

2017-10-10 王立群 环球医学

2017年9月,发表在《J Am Coll Cardiol》上的一项研究,调查了低梯度重度主动脉瓣狭窄(LGSAS)伴保留射血分数(EF)患者对硝普钠的急性血流动力学应答,研究结果表明:硝普钠可降低LGSAS伴保留EF患者的动脉后负荷和左心室充盈压,使得25%的患者重新分类为中度狭窄。

2017年9月,发表在《J Am Coll Cardiol》上的一项研究,调查了低梯度重度主动脉瓣狭窄(LGSAS)伴保留射血分数(EF)患者对硝普钠的急性血流动力学应答,研究结果表明:硝普钠可降低LGSAS伴保留EF患者的动脉后负荷和左心室充盈压,使得25%的患者重新分类为中度狭窄。

背景: LGSAS伴保留EF还未完全理解。动脉后负荷和舒张功能不全对LGSAS血流动力学表现的影响仍然未知。

目的:旨在确定LGSAS伴保留EF患者对硝普钠的急性血流动力学应答。

方法:进行心导管插入术的症状性LGSAS和保留EF患者,在硝普钠给药前和给药后比较了血流动力学测量。

结果:41例患者(25例低血流(LF),每搏输出量指数(SVI)≤35ml/m2,16例血流正常(NF))纳入到本研究中。基线时,LF患者具有较低的总动脉顺应性(0.36±0.12ml/m2/mmHg vs 0.48±0.16 ml/m2/mmHg;P=0.01)和较高的有效动脉弹性(2.77±0.84mmHg.m2/ml vs 1.89±0.82 mmHg.m2/ml;P=0.002)。所有患者中,硝普钠会降低弹性、左心室充盈压、肺动脉压,并改善依从性(P<0.05)。6例LF(24%)和4例NF(25%)患者的主动脉瓣区增加至≥1.0cm2。硝普钠带来的SVI改变与基线SVI成反比,仅在LF患者中证实有所改善(3±6ml/m2;P=0.02)。

结论:硝普钠可降低LGSAS伴保留EF患者的动脉后负荷和左心室充盈压,使得25%的患者重新分类为中度狭窄。基线SVI和SVI改变与后负荷降低之间具有负相关性,表明对后负荷的高度敏感性为LF-LGSAS病理生理学的显着促成因素。这些数据强调了使用后负荷降低在LGSAS的诊断性评估中的重要作用。

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    2018-08-05 jiyangfei
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    2018-02-23 hbwxf
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