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KMID : 1137820060270030083
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의공학회지
2006 Volume.27 No. 3 p.83 ~ p.88
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A New Method for Unconstrained Pulse Arrival Time (PAT) Measurement on a Chair
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Kim Ko-Keun
Chee Young-Joon
Lim Yong-Gyu
Choi Jin-Wook
Park Kwang-Suk
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Abstract
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A new method of measuring pulse arrival time (PAT), which is usually used for the estimation of systolic blood pressure, in an unconstrained manner using a chair, is proposed. The capacitive-coupled ECG (CC-ECG) measurement system and the air cushion with balancing tubes system were used for unconstrained PAT measurement. Firstly, the correlation between the standard PAT (S-PAT) from the photoplethysmography (PPG) and the PAT measured in an unconstrained manner (U-PAT) was evaluated. It was observed that U-PAT, which is the time delay from the R-peak of ECG to the steepest decent point of air cushion pressure wave, is significantly correlated with the S-PAT. Secondly, systolic blood pressure (SBP) measured by the radial tonometer is compared to the U-PAT. The ten-beat averaged U-PAT removed respiration effects and demonstrated a high intra-subject correlation with SBP in all participants. Finally, the tonometry SBP was estimated from these U-PAT values for one participant intermittently during half a day.
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KEYWORD
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pulse arrival time (PAT), blood pressure, unconstrained, ubiquitous healthcare
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