Estimation of conduction velocity vector fields from epicardial mapping data
Estimation of conduction velocity vector fields from epicardial mapping data
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DOI：
10.1109/10.668746
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发表时间：
1998-05-01
影响因子：
4.6
通讯作者：
Smith, WM
中科院分区：
文献类型：
--
作者：
Bayly, PV;KenKnight, BH;Smith, WM
介绍了一种根据观察到的心外膜细胞外电位自动估计传播速度矢量场的方法，该方法依赖于多项式曲面T（x, y）拟合到活动的时空（x, y， T）坐标。传播速度和传播方向由局部多项式曲面的梯度计算得到。速度分量，即总导数，用包含T梯度的偏导数表示，该方法在二维（2-D）传播模拟中得到验证，然后应用于心脏测绘数据。在猪的窦性心律、起搏和心室颤动（VF）期间，估计多个心外膜位置的传导速度。数据通过528通道测绘系统从23 × 22和24 × 21单极电极阵列缝合到右心室心外膜上获得。速度估计显示为矢量场，并用于定性和定量地描述传播在简单和复杂的节奏。
An automated method to estimate vector fields of propagation velocity from observed epicardial extracellular potentials is introduced, The method relies on fitting polynomial surfaces T(x, y) to the space-time (x, y, t) coordinates of activity. Both speed and direction of propagation are computed from the gradient of the local polynomial surface. The components of velocity, which are total derivatives, are expressed in terms of the partial derivatives which comprise the gradient of T, The method was validated on two-dimensional (2-D) simulations of propagation and then applied to cardiac mapping data. Conduction velocity was estimated at multiple epicardial locations during sinus rhythm, pacing, and ventricular fibrillation (VF) in pigs. Data were obtained via a 528-channel mapping system from 23 x 22 and 24 x 21 arrays of unipolar electrodes sutured to the right ventricular epicardium. Velocity estimates are displayed as vector fields and are used to characterize propagation qualitatively and quantitatively during both simple and complex rhythms.