Digital signal processing of the wideband external pulse recorded during cuff deflation: a new way to measure blood pressure.
Aa new method of measuring blood pressure (BP) is presented. This technique involves automatic analysis of the wideband external pulse (WEP) recorded by a pressure sensor positioned over the brachial artery during standard BP cuff deflation. Three distinct components of this "K" or "WEP" signal can be defined: K1, K2, and K3 [1]. Each component has a different shape and "appearance/disappearance property. K1 is a low frequency inaudible signal present with cuff pressure above systolic. The K2 signal appears at SP and disappears at Dp (K2-algorithm) and can be used to measure BP. Using this property, the "K2-algorithm" has been shown to be more accurate than the auscultatory technique [1]. To implement an automatic measurement using the K2-algorithm, signal processing techniques are applied to K signals.
Yeol
Joe W
JW
Dept. of Mechanical Eng., Columbia Univ., New York, NY 10027, USA.
Ryu
Yeong S
YS
Blank
Seymour G
SG
D000465:Algorithms; D001331:Automation; D001794:Blood Pressure; D001795:Blood Pressure Determination / Q000295:instrumentation / Q000379:methods*; D015924:Blood Pressure Monitors; D004562:Electrocardiography / Q000295:instrumentation / Q000379:methods; D004867:Equipment Design; D006339:Heart Rate; D006801:Humans; D015233:Models, Statistical; D012107:Research Design; D012815:Signal Processing, Computer-Assisted; D013997:Time Factors; D014160:Transducers, Pressure