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Sensors 2017, 17(5), 1176; doi:10.3390/s17051176

A Cuffless Blood Pressure Measurement Based on the Impedance Plethysmography Technique

1
Department of Computer Science and Information Engineering, Chaoyang University of Technology, Taichung 41349, Taiwan
2
Department of Biomedical Imaging and Radiological Science, China Medical University, Taichung 40402, Taiwan
3
Institute of Medicine, School of Medicine, Chung-Shan Medical University; Department of Internal Medicine, Chung-Shan Medical University Hospital, Taichung 40201, Taiwan
*
Authors to whom correspondence should be addressed.
Academic Editors: Edward Sazonov and Subhas Chandra Mukhopadhyay
Received: 10 April 2017 / Revised: 11 May 2017 / Accepted: 16 May 2017 / Published: 21 May 2017
(This article belongs to the Special Issue Wearable and Ambient Sensors for Healthcare and Wellness Applications)
View Full-Text   |   Download PDF [8267 KB, uploaded 23 May 2017]   |  

Abstract

In the last decade, cuffless blood pressure measurement technology has been widely studied because it could be applied to a wearable apparatus. Electrocardiography (ECG), photo-plethysmography (PPG), and phonocardiography are always used to detect the pulse transit time (PTT) because the changed tendencies of the PTT and blood pressure have a negative relationship. In this study, the PPG signal was replaced by the impedance plethysmography (IPG) signal and was used to detect the PTT. The placement and direction of the electrode array for the IPG measurement were discussed. Then, we designed an IPG ring that could measure an accurate IPG signal. Twenty healthy subjects participated in this study. The changes in blood pressure after exercise were evaluated through the changes of the PTT. The results showed that the change of the systolic pressure had a better relationship with the change of the PTTIPG than that of the PTTPPG (r = 0.700 vs. r = 0.450). Moreover, the IPG ring with spot electrodes would be more suitable to develop with the wearable cuffless blood pressure monitor than the PPG sensor. View Full-Text
Keywords: cuffless blood pressure measurement; impedance plethysmography; pulse transit time cuffless blood pressure measurement; impedance plethysmography; pulse transit time
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Liu, S.-H.; Cheng, D.-C.; Su, C.-H. A Cuffless Blood Pressure Measurement Based on the Impedance Plethysmography Technique. Sensors 2017, 17, 1176.

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