Changes in left ventricular volume during head-up tilt in patients with vasovagal syncope: an echocardiographic study.
Changes in left ventricular volume during head-up tilt in patients with vasovagal syncope: an echocardiographic study.
复制标题
血管迷走性晕厥患者抬头倾斜时左心室容积的变化：一项超声心动图研究。
DOI：
10.1016/s0002-8703(96)90053-8
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发表时间：
1996
影响因子：
4.8
通讯作者：
Fouad-Tarazi,FM
中科院分区：
文献类型：
--
作者：
Yamanouchi,Y;Jaalouk,S;Shehadeh,AA;Jaeger,F;Goren,H;Fouad-Tarazi,FM
我们测试了这样一种假设，即在直立倾斜期间有血管迷走性晕厥的患者，其左心室容量对倾斜的反应比正常受试者更大的减少。采用二维超声心动图进行仰卧位和分级倾斜时的测量。我们比较了7名血管迷走性晕厥患者和9名正常志愿者。在倾斜过程中，血管迷走组的舒张末容量指数下降的速度快于正常受试者。血管迷走组在倾斜时的卒中指数和射血分数比正常受试者更显著地降低，这可能是由于倾斜时静脉系统中的血液容量更多的周边性移位以及迷走神经对心室收缩的早期影响。
We tested the hypothesis that patients who have vasovagal syncope during head-up tilt have a greater decrease in their left ventricular volume in response to tilt than do normal subjects. Measurements were done in the supine position and during graded tilt by using two-dimensional echocardiography. We compared seven patients with vasovagal syncope with nine normal volunteers. The rate of reduction of end-diastolic volume index during tilt was faster in the vasovagal group than in normal subjects. A more significant reduction of stroke index and ejection fraction during tilt was found in the vasovagal group than in normal subjects, possibly because of more peripheral translocation of blood volume in the venous system during tilt and an early vagal effect on ventricular contraction.