JZUS - Journal of Zhejiang University SCIENCE

Journal of Zhejiang University SCIENCE A 2011 Vol.12 No.6 P.438-445

A novel non-iterative shape method for estimating the decay time constant of the finger photoplethysmographic pulse

Author(s): Ling-xiao Hou, Ming Wei, Xuan Wang, Xin-zhong Chen, Ying Feng, Kai Jiang
Affiliation(s): Key Laboratory of Biomedical Engineering of Ministry of Education, Department of Biomedical Engineering, Zhejiang University, Hangzhou 310027, China, Department of Anaesthesia, Women’s Hospital, Hangzhou 310006, China, Institute of Space Medical Engineering, Beijing 100094, China
Corresponding email(s): beasthlx@163.com, jiangkai1979@vip.sina.com
Key Words: Photoplethysmogram (PPG), Decay time constant, Non-iterative shape method (NSM), Area difference ratio (ADR)

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Abstract: The photoplethysmogram (PPG) of a pulse wave, similar in appearance to the arterial blood pressure (ABP) waveform, contains rich information about the cardiovascular system. The decay time constant RC, equal to the product of peripheral resistance R and total arterial compliance C, is a meaningful cardiovascular model parameter in vascular assessment. Using or ameliorating the existing ABP methods does not achieve a satisfactory estimation of RC from the PPG volume pulse (VRC). Thus, a novel non-iterative shape method (NSM) of evaluating VRC is introduced in this paper. The mathematic expression between a novel, readily available morphological parameter called the area difference ratio (ADR) and VRC was established. As it was difficult to calculate VRC from the complicated expression analytically, we recommend estimating it using a piecewise linear interpolation criterion. Also, since the effect of the PPG magnitude is eliminated in the calculation of ADR, precaliberation or normalization is dispensable in the NSM. Results of human experiments indicated that the NSM was computationally efficient, and the simulation experiments confirmed that the NSM was theoretically available for ABP.

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