Evaluation of the effect of posture on carotid-to-toe pulse transit time values estimated using system identification Online publication date: Tue, 23-Jul-2019
by Aws Zuhair Sameen; Rosmina Jaafar; Edmond Zahedi
International Journal of Biomedical Engineering and Technology (IJBET), Vol. 31, No. 1, 2019
Abstract: Pulse transit time (PTT) is defined as the time a pulse wave needs to travel from one point of the blood circulation to another point. Monitoring PTT values of a person is useful in non-invasive, cuff-less estimation of blood pressure measurement. In this paper, PTT values estimated from two PPG signals from the reflective photoplethysmography of carotid and toe that are collected from 12 healthy subjects (eight males and four females) age 23.8 ± 1.5 years. PTT has been estimated using an auto-regressive (ARX) model. PTT values were estimated for all subjects in three different positions; sit, stand and supine. Results show that the PTT in sit and stand positions are statistically no different (84.5 ± 19.6 ms versus 78 ± 15.9 ms, p = 0.44). However, the PTT in the supine position is significantly higher than the two other positions (145.7 ± 18.4 ms versus 84.5 ± 19.6 ms and 145.7 ± 18.4 ms versus 78 ± 15.9 ms respectively, p < 0.01 for both situations).
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