Akiyama R, Nagashima T, Tazawa H
Department of Electrical and Electronic Engineering, Muroran Institute of Technology, Japan.
Comp Biochem Physiol A Mol Integr Physiol. 1999 Dec;124(4):469-74. doi: 10.1016/s1095-6433(99)00139-7.
We attempted a new approach based on a modern dynamical system theory to reconstruct the arterial blood pressure signals in relation to heart rate fluctuations of developing chick embryos. The dynamical systems approach in general is to model a phenomenon that is presented by a single time series record and approximate the dynamical property (e.g. heart rate fluctuations) of a system based only on information contained in a single-variable (arterial blood pressure) of the system. The time-series data of the arterial blood pressure was reconstructed in 3-dimensional space to draw characteristic orbits. Since the reconstructed orbits of the blood pressure should retain information contained in the pressure signals, we attempted to derive instantaneous heart rate (IHR) from the reconstructed orbits. The derived IHR presenting HR fluctuations coincided well with the IHR obtained conventionally from the peak-to-peak time intervals of the maximum blood pressure. Movements of the reconstructed orbits of the arterial blood pressure in 3-dimensional space reflected HR fluctuations (i.e. transient decelerations and accelerations).
我们尝试了一种基于现代动力系统理论的新方法，以重建与发育中的鸡胚心率波动相关的动脉血压信号。一般来说，动力系统方法是对由单个时间序列记录呈现的现象进行建模，并仅基于系统单变量（动脉血压）中包含的信息来近似系统的动力学特性（如心率波动）。将动脉血压的时间序列数据在三维空间中进行重建，以绘制特征轨道。由于重建的血压轨道应保留压力信号中包含的信息，我们试图从重建轨道中导出瞬时心率（IHR）。所导出的呈现心率波动的IHR与传统上从最大血压的峰峰值时间间隔获得的IHR非常吻合。动脉血压在三维空间中重建轨道的运动反映了心率波动（即瞬时减速和加速）。
