摘要
目的探索腕部充气测量血压的方法及原理,实现小波变换提取脉搏波以及无创血压的计算,为现有腕式电子血压计提供更精确的算法。方法采用小波变换对采集的袖带脉搏压力混合信号进行去噪处理,并分离脉搏波与袖带压。在此基础上采用差分法与阈值法寻找脉搏波峰值点并修正波形干扰点,再对脉搏波峰值点进行高斯曲线拟合法拟合出平滑包络线,并采用改进的幅度系数法进行收缩压、舒张压的计算,并对30名测试者用本方法与听诊法进行对比测试,观察相关性。结果该方法的测试结果与听诊法对比相关性良好,测量血压速度快,舒适度高。结论基于小波变换的充气法测量血压的算法相比传统方法去噪效果好,脉搏波提取精确度高,血压计算结果符合AAMI标准,但需在软件处理算法中做进一步简化研究。
Objective To explore the principles and methods of the wrist inflatable blood pressure,and to realize the method using wavelet transform to extract the pulse wave and calculate the noninvasive blood pressure, we provide a more accurate algorithm for existing wrist electronic blood pressure monitor. Methods The cuff pulse mixed pressure signal is denoised and separated by wavelet transform. Based on this, we use finite difference method and threshold method to find the pulse peak value points and fix the points of waveform interference. Then,the pulse peak value points are smoothly enveloped by Gaussian curve fitting method, and the sysolic pressure and the diastolic pressure are calculated by using the improved amplitude coefficient method. Thirty subjects are tested by this method and the auscultation method to observe the correlation. Results The correlation of this method and auscultation method is good, and the blood pressure are measured fast and comfortable by this method. Conclusions Pneumatic blood pressure measurement based on wavelet transform shows that this method is better in denoising effect and has a higher precision compared with the traditional method. The calculated results accord with AAMI standards,and we need to do further research in simplifying the software processing algorithms.
出处
《北京生物医学工程》
2015年第6期600-606,共7页
Beijing Biomedical Engineering
基金
北京交通大学校医院合作项目(2013JBZ014)资助
关键词
充气测量法
小波变换
差分
无创血压
高斯拟合
pneumatic measurement
wavelet transform
difference
noninvasive blood pressure
Gaussian curve fitting
