title: A Chair-Based Unobtrusive Cuffless Blood Pressure Monitoring System Based on Pulse Arrival Time.
abstract: In this paper, we present an unobtrusive cuffless blood pressure (BP) monitoring system based on pulse arrival time (PAT) for facilitating long-term home BP monitoring. The proposed system consists of an electrocardiograph (ECG), a photoplethysmograph (PPG), and a control circuit with a Bluetooth module, all of which are mounted on a common armchair to measure ECG and PPG signals from users while sitting on the armchair in order to calculate continuous PAT. Considering the good linear correlation of systolic BP (SBP) and the nonlinear correlation of diastolic BP (DBP) with PAT, a new BP estimation method was proposed. Ten subjects underwent BP monitoring experiments involving stationary sitting on a chair, lying on a bed, and pedaling using an ergometer in order to assess the accuracy of the estimated BP. A cuff-type BP monitor was used as reference in the experiments. Results showed that the mean difference of the estimated SBP and DBP was within 0.2 ± 5.8 mmHg ( p < 0.00001) and 0.4 ± 5.7 mmHg ( p < 0.00001), respectively, and the mean absolute difference of the estimated SBP and DBP were 4.4 and 4.6 mmHg, respectively, compared to references. Additionally, five subjects participated in data collections consisting of sitting on a chair twice a day for one month. Compared to the reference, the difference did not obviously increase along with time, even though individualized calibration was executed only once at the beginning. These results suggest that the proposed system has quite the potential for long-term home BP monitoring.
authors.forename: Zunyi
authors.initials: Z
authors.lastname: Tang
authors.forename: Toshiyo
authors.initials: T
authors.lastname: Tamura
authors.forename: Masaki
authors.initials: M
authors.lastname: Sekine
authors.forename: Ming
authors.initials: M
authors.lastname: Huang
authors.forename: Wenxi
authors.initials: W
authors.lastname: Chen
authors.forename: Masaki
authors.initials: M
authors.lastname: Yoshida
authors.forename: Kaoru
authors.initials: K
authors.lastname: Sakatani
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kobayashi
authors.forename: Shigehiko
authors.initials: S
authors.lastname: Kanaya
mesh_terms: D000465:Algorithms; D001794:Blood Pressure / Q000502:physiology; D001795:Blood Pressure Determination / Q000379:methods*; D004562:Electrocardiography / Q000379:methods; D005260:Female; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008297:Male; D017156:Photoplethysmography / Q000379:methods; D012815:Signal Processing, Computer-Assisted