Title: Design and developing a photoplethysmographic device dedicated to the evaluation of representative indexes in the response to vascular filling using systolic time intervals
Authors: M. Nasr Kaid Ali; Benabdellah Mohammed; A. Amine Aissa Mokbil
Addresses: Department of Biomedical Engineering, Tlemcen University, Chetouane, BP 230, Tlemcen13000, Algeria ' Department of Biomedical Engineering, Tlemcen University, Chetouane, BP 230, Tlemcen13000, Algeria ' Department of Biomedical Engineering, Tlemcen University, Chetouane, BP 230, Tlemcen13000, Algeria
Abstract: In this study, we develop an interface (human-machine) for monitoring the cardiovascular-respiratory system, through the evaluation of analogous indices obtained from a finger photoplethysmography pulse oximetry waveform. This interface consists of sensors, electronics associated with these sensors, acquisition card to make the communication with a local computer post and a graphical interface developed in visual basic environment for signals tracing and data archiving. In this work, we achieved the evaluation of representative indexes for the response to vascular filling, using systolic time intervals (STIs) namely, pre ejection period (PEP), respiratory change in pre ejection period (ΔPEP), left ventricular ejection time (LVET) and systolic time ratio (STR). Given that STIs, are highly correlated to the fundamental cardiac functions. In order to achieve this goal, a data collection study was conducted using synchronised acquisitions of electrocardiogram (ECG), photoplethysmogram (PPG) and pneumotachogram (PTG) signals.
Keywords: photoplethysmogram; PPG; pneumotachogram; PTG; pre ejection period; PEP; ΔPEP; LVET; systolic time ratio; STR; systolic time intervals; STIs; RS232; microcontroller; visual basic; vascular filling; electrocardiogram; ECG.
International Journal of Biomedical Engineering and Technology, 2019 Vol.31 No.3, pp.240 - 259
Received: 13 Dec 2016
Accepted: 23 Mar 2017
Published online: 07 Oct 2019 *