Adaptive blood pressure estimation from wearable PPG sensors using peripheral artery pulse wave velocity measurements and multi-channel blind identification of local arterial dynamics

Abstract

A method for estimating pulse wave velocity (PWV) using circulatory waveform signals derived from multiple photoplethysmograph (PPG) sensors is described. The method employs two wearable in-line PPG sensors placed at a known distance from one another at the ulnar and digital artery. A technique for calibrating the measured pulse wave velocity to arterial blood pressure using hydrostatic pressure variation is presented. Additionally, a framework is described for estimating local arterial dynamics using PPG waveforms and multi-channel blind system ID. Initial results implementing the method on data derived from a human subject at different arterial pressures is presented. Results show that the method is capable of measuring the changes in arterial PWV that result from fluctuations in mean arterial pressure.

Wireless physiological monitoring system for psychiatric patients

“…T placed on the ulnar artery (wrist) with the other sensor on the digital ar Figure A-3 [53]. The wrist sensor uses the reflectance oximetry LED and photodiode are placed next to each other over the ulnar on the digital artery uses the transmission method where the photodiode are placed on each side of the digital artery.…”

“…A possible pulse wave velocity (PWV) method shown by McCombie et al [53] using pulse transit time (PTT) techniques can be further investigated.…”

The Emergence of Ambulatory Measurement of Arterial Stiffness and Central Blood Pressure. A Promising Novelty of Clinical Importance or Just Another Marker?

“…Taking into account the fact the PWV depends heavily on arterial pressure, someone can conclude that variations of BP during postural movements could negatively affect the precise measurement of arterial stiffness parameters. The observed obstacle is one of the reasons why efforts to obtain ambulatory PWV measurements are still confined to a very rudimental, experimental level [57,58]. In this context, until more reliable methods for the ambulatory measurement of PWV come up, diurnal variation of arterial stiffness and its possible applications -implications will continue to be a promising field of cardiovascular research.…”

Vizsgálati módszerek fejlesztése és alkalmazása a neurokardiológiai fluktuációk automatizált feldolgozásában

“…Az optikai úton működő fotopletizmográfok olyan -általában kompakt, kisméretű -eszközök, melyek elfogadható pontossággal szolgáltatnak információt szívfrekvenciáról, vérnyomásról, annak dinamikájáról [15][16][17][18]. Ezek az alkalmazások a magasan integrált technológiák terjedésével az utóbbi időben nemcsak a klinikai gyógyászatban, hanem az oktatásban és a magánszfé-rában is egyre népszerűbbek hordozhatóságuk és alacsony áruk révén.…”

“…Ilyen esetekben az ismertetett eljárások sem adtak egyönte-tűen kezelhető válaszokat (18. ábra). 18. ábra.…”