Abstract
Cuffless blood pressure (BP) estimation using pulse arrival time (PAT) has become popular in recent years. There are several approaches to calculate PAT from various sensors placed on the body. In this chapter, the shoulder’s bio-impedance (BImp) signal is used as a surrogate together with ECG to estimate cuffless systolic BP (SBP) based on four different PAT readings. Different BP trends have been experimentally validated for varying postures and physical exercises. Data was collected from 43 participants in supine, sitting, or standing postures. Among all these participants, 26 were asked to undertake light, moderate, and heavy cycling on an exercise bike. SBP calculation results using each PAT calculation have been compared in terms of estimation accuracy. Overall, the results of SBP calculation with PAT obtained from the maximum value of the first derivative of BImp pulse signal are at least 2% more accurate than other methods.
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