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Development of a Finger-Ring-Shaped Hybrid Smart Stethoscope for Automatic S1 and S2 Heart Sound Identification

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Author(s)
Soomin LeeQun WeiHeejoon ParkYuri NaDonghwa JeongHongjoon Lim
Keimyung Author(s)
Qun, WeiPark, Hee Jun
Department
Dept. of Biomedical Engineering (의용공학과)
Journal Title
Sensors (Basel)
Issued Date
2021
Volume
21
Issue
18
Keyword
finger-ring shapeheart soundsphonocardiogramphotoplethysmogramShannon entropystethoscope
Abstract
Cardiac auscultation is one of the most popular diagnosis approaches to determine cardiovascular status based on listening to heart sounds with a stethoscope. However, heart sounds can be masked by visceral sounds such as organ movement and breathing, and a doctor's level of experience can more seriously affect the accuracy of auscultation results. To improve the accuracy of auscultation, and to allow nonmedical staff to conduct cardiac auscultation anywhere and anytime, a hybrid-type personal smart stethoscope with an automatic heart sound analysis function is presented in this paper. The device was designed with a folding finger-ring shape that can be worn on the finger and placed on the chest to measure photoplethysmogram (PPG) signals and acquire the heart sound simultaneously. The measured heart sounds are detected as phonocardiogram (PCG) signals, and the boundaries of the heart sound variation and the peaks of the PPG signal are detected in preprocessing by an advanced Shannon entropy envelope. According to the relationship between PCG and PPG signals, an automatic heart sound analysis algorithm based on calculating the time interval between the first and second heart sounds (S1, S2) and the peak of the PPG was developed and implemented via the manufactured prototype device. The prototype device underwent accuracy and usability testing with 20 young adults, and the experimental results showed that the proposed smart stethoscope could satisfactorily collect the heart sounds and PPG signals. In addition, within the developed algorithm, the device was as accurate in start-points of heart sound detection as professional physiological signal-acquisition systems. Furthermore, the experimental results demonstrated that the device was able to identify S1 and S2 heart sounds automatically with high accuracy.
Keimyung Author(s)(Kor)
웨이췬
박희준
Publisher
School of Medicine (의과대학)
Citation
Soomin Lee et al. (2021). Development of a Finger-Ring-Shaped Hybrid Smart Stethoscope for Automatic S1 and S2 Heart Sound Identification. Sensors (Basel), 21(18), 6294. doi: 10.3390/s21186294
Type
Article
ISSN
1424-8220
Source
https://www.mdpi.com/1424-8220/21/18/6294
DOI
10.3390/s21186294
URI
https://kumel.medlib.dsmc.or.kr/handle/2015.oak/44066
Appears in Collections:
1. School of Medicine (의과대학) > Dept. of Biomedical Engineering (의용공학과)
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