Di Rienzo M, Castiglioni P, Parati G, Mancia G, Pedotti A
LaRC--Centro di Bioingegneria, Fondazione Pro Juventute, Milano, Italy.
Med Biol Eng Comput. 1996 Mar;34(2):133-41. doi: 10.1007/BF02520018.
Sino-aortic denervation (SAD) is employed in cats to evaluate the baroreflex influence on blood pressure (BP) and pulse interval (PI) spectral components from 0.00008 to 0.9 Hz as assessed by FFT wide-band spectra and their 1/f modelling; and the linear coupling between BP and PI and between systolic and diastolic BP as assessed by coherence analysis. Specific procedures have been developed to obtain an effective smoothing of spectra and coherence functions. SAD induced an increase in BP powers from 0.03 to 0.0006 Hz and a power reduction of most of the remaining BP components; a reduction of PI powers at all frequencies; marked deviations of BP spectra from the 1/f trend; a reduction of the coherence between BP and PI from 0.12 to 0.5 Hz and a coherence enhancement at lower frequencies. These findings indicate that the arterial baroreflex modulates both fast and slow spectral components of BP and PI; homogeneously enhances PI fluctuations at all frequencies; produces differentiated effects on BP fluctuations along the frequency axis; and at low frequencies exerts the buffering action on BP through strategies which reduce the BP-PI linear link.
在猫身上采用去 sino - 主动脉神经支配（SAD）来评估压力反射对血压（BP）和脉搏间期（PI）频谱成分（频率范围为 0.00008 至 0.9 Hz，通过快速傅里叶变换宽带频谱及其 1/f 建模进行评估）的影响；以及通过相干分析评估 BP 与 PI 之间以及收缩压与舒张压之间的线性耦合。已开发出特定程序以有效平滑频谱和相干函数。SAD 导致 0.03 至 0.0006 Hz 的 BP 功率增加，其余大部分 BP 成分的功率降低；所有频率下 PI 功率降低；BP 频谱明显偏离 1/f 趋势；BP 与 PI 之间 0.12 至 0.5 Hz 的相干性降低，低频处相干性增强。这些发现表明，动脉压力反射调节 BP 和 PI 的快速和慢速频谱成分；在所有频率上均匀增强 PI 波动；沿频率轴对 BP 波动产生不同影响；并且在低频处通过减少 BP - PI 线性联系的策略对 BP 发挥缓冲作用。
