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- Title
The Effects of Pacing Site on Left Ventricular Epicardial Surface Velocity Patterns During Systole.
- Authors
Herr, Michael D.; Luck, Jerry C.; Orledge, Jeffrey D.; Copenhaver, Gary L.; McInerney, Joseph J.
- Abstract
Changes in epicardial LV velocity patterns during isovoluinic 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 isovolurnic 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.
- Subjects
CARDIAC pacing; CARDIAC contraction; HEART ventricles; HEART atrium; CARDIOLOGY
- Publication
Pacing & Clinical Electrophysiology, 1994, Vol 17, Issue 5, p901
- ISSN
0147-8389
- Publication type
Article
- DOI
10.1111/j.1540-8159.1994.tb01431.x