[The lower limb blood pressure measurement of ankle-brachial index based on underdetermined blind signal].
As there are a number of ankle arteries and some of them can not be blocked completely under higher pressure from the external inflate cuff, we can not accurately identify the starting point of the pulse wave, so the errors of lower limb systolic blood pressure measurement take place and affect the accuracy of ankle-brachial index in diagnosing vascular disease. In this paper, we constructed delay vectors from the data we already collected from lower limb pulse wave and formed an embedding matrix; thus solving the problem of inadequate sensor dimensions. We extracted a single arterial pulse wave through the blind signal separation on the basis of embedding matrix, and we identified the lower limb systolic blood pressure corresponding to the starting point. Simulation and clinical experiments show the method can be used to separate the wave signals of ankle artery which contains information of systolic blood pressure. It improves the accuracy of lower limb systolic blood pressure measurement and hence provides accurate data for the clinical diagnosis of arterial disease.
Liu
Baohua
B
College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China. liubaohua@ysu.edu.cn
Dai
Chengwu
C
D000465:Algorithms; D000842:Ankle / Q000098:blood supply*; D001794:Blood Pressure; D001795:Blood Pressure Determination / Q000379:methods*; D001916:Brachial Artery / Q000502:physiology*; D006801:Humans; D007866:Leg / Q000098:blood supply*; D011673:Pulsatile Flow / Q000502:physiology; D012815:Signal Processing, Computer-Assisted