HHT方法分析冠心病患者支架置入手术对其脉搏波的影响

he HHT method is adopted to explore the influence of implanting a stent into the coronary artery on the wrist pulse signals. A nonlinear and nonstationary digital signal sequence can be decomposed by using the empirical mode decomposition method (EMD) into a set of intrinsic-mode-function (IMF) components, which correspond to disparate excitation mechanisms. This is a new and applicable time series analysis method based on mode decomposition. A series of wrist pulse signals of healthy people in different age groups are decomposed in order to obtain general criteria of different modes in relation to corresponding physiological mechanisms. A few of wrist pulse signals are clinically collected from those patients suffered from coronary artery disease before and after stent implantations and decomposed respectively to obtain the particular pathological mode information. And the special pathologic mode is compared with that of healthy people. It is found that mode C3 is correlative in statistical dependence with whether the coronary artery of a patient is narrow.