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Bioacoustic detection of the third heart sound: a preliminary patient study
Linköping University, Department of Biomedical Engineering. Linköping University, The Institute of Technology.
Linköping University, Department of Biomedical Engineering. Linköping University, The Institute of Technology.
Linköping University, Department of Medicine and Care. Linköping University, Faculty of Health Sciences.
Linköping University, Department of Medicine and Care. Linköping University, Faculty of Health Sciences.ORCID iD: 0000-0001-6353-8041
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

Body sounds are related to mechanical processes in the body. Thus, the heart can be seen as a sound generator and the heart sounds as mechanical fingerprints of myocardial function.

This sound normally occurs in children but disappear with maturation. The sound can also appear in patients with heart failure. The sound is characterized by its low amplitude and low frequency content, which makes it difficult to identify by the use of the traditional stethoscope.

We have recently developed a wavelet based method for detection of the third heart sound. Our intention with this study was to investigate if a third heart sound could be identified in patients with a diagnosis of heart failure attending the heart failure clinic using this detection method. It was also our intention to compare our method with auscultation using a conventional phonocardiography, and characterizing the patients with echocardiography.

Using the wavelet method (study 1), 87% of the third heart sounds that were identified from the recordings (with the visual method as a reference) were detected, 12% were missed and 2% were false positive. In study 2, the wavelet detection method identified all (100%) of patients with identified third heart sound and regular phonocardiography identified 2 (13%) of the subjects.

Keyword [en]
Noninvasive, Third heart sound, Wavelet, Heart failure, Heart sounds, Phonocardiogram, Auscultation, Echocardiography
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-86738OAI: oai:DiVA.org:liu-86738DiVA: diva2:581550
Available from: 2013-01-02 Created: 2013-01-02 Last updated: 2013-09-26
In thesis
1. Bioacoustic principles used in monitoring and diagnostic applications
Open this publication in new window or tab >>Bioacoustic principles used in monitoring and diagnostic applications
2002 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The idea behind this work is linked to the experience gained from the long use of the stethoscope, and to the fact that sound originating from the body is a mechanical fingerprint, reflecting the human body functions.

The aims of this thesis have been to develop bioacoustic systems using modern medical signal processing in three applications. The first was to develop a method for monitor the respiration, the second was to develop a detection method for the third heart sound and, the third was to study a swallowing detection technique and look into the potential of bioacoustic development in this area.

Respiratory monitoring is of vital importance in several clinical situations. A bioacoustic signal analysis approach has been developed for monitoring of respiration. This approach includes strategies to differentiate between inspiration and expiration. In two different patient groups, the method has managed to detect 98% of the respiratory cycles.

The third heart sound has been found to be related to heart failure. A tailored wavelet technique has been developed fur detection of the third heart sound. The method has been used in children and in patients with heart failure. The wavelet metod detected 87% of the third heart sounds and only 2% were classified as false positive.

An investigation of an existing method for swallowing detection, computerized laryngeal analyser (CLA), was performed toghether with a pilot study involving swallowing sounds for the detection. The CLA technique was found to be inadequate for swallowing detection. The bioacoustic approach showed promise for detection of swallows.

We expect in the future that bioacoustics will be an important medical field, for diagnosis, monitoring, rehabilitation and education. The methods show potential for increased use, both in hospital and primary care.

Place, publisher, year, edition, pages
Linköping: Linköpings universitet, 2002. 72 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 778
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-24564 (URN)6729 (Local ID)91-7373-438-1 (ISBN)6729 (Archive number)6729 (OAI)
Public defence
2002-11-08, Aulan, Administrationshuset, Universitetssjukhuset, Linköping, 10:15 (Swedish)
Opponent
Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2013-01-02

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Hult, PeterHildén, KatrinDahlström, UlfWranne, BengtAsk, Per

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Hult, PeterHildén, KatrinDahlström, UlfWranne, BengtAsk, Per
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Department of Biomedical EngineeringThe Institute of TechnologyDepartment of Medicine and CareFaculty of Health Sciences
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