The effects of pacing site on left ventricular epicardial surface velocity patterns during systole.
The effects of pacing site on left ventricular epicardial surface velocity patterns during systole.
复制标题
起搏部位对收缩期左心室心外膜表面速度模式的影响。
DOI：
10.1111/j.1540-8159.1994.tb01431.x
复制
发表时间：
1994
期刊：
影响因子：
--
通讯作者：
McInerney,JJ
中科院分区：
文献类型：
--
作者：
Herr,MD;Luck,JC;Orledge,JD;Copenhaver,GL;McInerney,JJ
在15只犬上观察了心室起搏引起的等容收缩和射血过程中心外膜左室速度型的变化。一种非侵入性成像技术，提供了高的时间分辨率被用来研究的时间向外扩张的LV在等容收缩和一个向内的LV速度波阵面在喷射过程中的传播模式。使用该技术，以5 msec间隔测量LV游离壁上50-70个位置的表面位移（± 0.1 mm SD）。通过区分表面位移波形计算速度，并使用插值程序提供LV表面的详细彩色编码速度图。根据闭胸腔内起搏期间从四个部位（右心房、右心室心尖、左心室心尖和右心室流出道）获得的数据确定LV表面速度。这些表面速度显示出不同的空间和时间模式，为每个起搏部位。结果表明，这种非侵入性标测程序有可能确定异位心室病灶的位置。
Changes in epicardial LV velocity patterns during isovolumic contraction and ejection as induced by ventricular pacing were studied in 15 canines. A noninvasive imaging technique that provided high temporal resolution was used to study the timing of an outward expansion of the LV during isovolumic contraction and the propagation pattern of an inward LV velocity wavefront during ejection. With this technique, surface displacements were measured (± 0.1 mm SD) at 50–70 locations on the LV free wall at 5‐msec intervals. Velocities were calculated by differentiating the surface displacement waveforms and an interpolation procedure was used to provide detailed color coded velocity maps of the LV surface. LV surface velocities were determined from data obtained during closed‐chest endocardial pacing from each of four sites: right atrium, right ventricular apex, left ventricular apex, and right ventricular outflow tract. These surface velocities showed a distinct spatial and temporal pattern for each pacing site. The results show that this noninvasive mapping procedure has potential for determining the location of an ectopic ventricular focus.