Design and Parametric Analysis of a Wearable Dual-Photoplethysmograph Based System for Pulse Wave Velocity Detection
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© 2017 IEEE. Ambulatory blood pressure monitoring (ABPM) is a term used to describe measurement of blood pressure (BP) at regular intervals and can be an important diagnostic tool, especially for hypertensive patients. Since traditional cuff-based measurement of blood pressure is not convenient for a continuous, ABPM measurement, one approach that is being explored is pulse wave velocity (PWV), which is known to be correlated with blood pressure. However, an easily wearable and reliable system has not been realized to date. In this work, we examine the feasibility and design requirements for measuring PWV using two photoplethysmography sensors placed 4 cm apart on the arm. Measurements of PWV in vivo were made with our system and we showed that PWV measurements changed in accord with induced variations in blood pressure of the subject. Furthermore, we examined the minimum requirements for the sampling rate and bit resolution for the analog-to-digital converter (ADC) in our system with error in PWV measurement as the criterion. Our results show the feasibility of measuring PWV at small distances and outlined the design requirements for an ABPM device.
author list (cited authors)
Trujillo, Z., Nathan, V., Coté, G. L., & Jafari, R.