A novel method for estimating 3-D conduction velocity vector fields provided automated qualitative and quantitative descriptions of electrical activity in canine myocardium.
A method was developed to estimate three-dimensional (3-D) conduction velocity vector fields in cardiac tissue. The technique was applied to sinus rhythm and pacing mapped with plunge needles at 396-466 sites in the canine myocardium. The speed and direction of propagation was found from polynomial "surfaces" fitted to space-time (x,y,z,t) coordinates of cardiac activity (a generalization of a prior 2-D method). Conduction velocity under ischemic conditions was examined after occlusion of the circumflex (CFX). Estimates of conduction speeds during pacing and ischemia were slower than those found during normal sinus rhythm. Vector field directions were also found to differ between different types of beats. The method was validated on simulated 3-D plane and spherical waves. The proposed approach to completing velocity vector fields provides automated qualitative and quantitative description of electrical activity in 3-D tissue.
Barnette et al. (Wed,) conducted a other in Cardiac mapping / Ischemia. 3-D conduction velocity vector field estimation method was evaluated on Estimation of conduction speeds and vector field directions. A novel method for estimating 3-D conduction velocity vector fields provided automated qualitative and quantitative descriptions of electrical activity in canine myocardium.