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Hildén, Karin
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Publications (2 of 2) Show all publications
Hult, P., Fjällbrant, T., Hildén, K., Dahlström, U., Wranne, B. & Ask, P. (2005). Detection of the third heart sound using a tailored wavelet approach: Method verification. Medical and Biological Engineering and Computing, 43(2), 212-217
Open this publication in new window or tab >>Detection of the third heart sound using a tailored wavelet approach: Method verification
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2005 (English)In: Medical and Biological Engineering and Computing, ISSN 0140-0118, E-ISSN 1741-0444, Vol. 43, no 2, p. 212-217Article in journal (Refereed) Published
Abstract [en]

Heart sounds can be considered as mechanical fingerprints of myocardial function. The third heart sound normally occurs in children but disappears with maturation. The sound can also appear in patients with heart failure. The sound is characterised by its low-amplitude and low-frequency content, which makes it difficult to identify by the traditional use of the stethoscope. A wavelet-based method has recently been developed for detection of the third heart sound. This study investigated if the third heart sound could be identified in patients with heart failure using this detection method. The method was also compared with auscultation using conventional phonocardiography and with characterisation of the patients with echocardiography. In the first study, 87% of the third heart sounds were detected using the wavelet method, 12% were missed, and 6% were false positive. In study 2, the wavelet-detection method identified 87% of the patients using the third heart sound, and regular phonocardiography identified two (25%) of the subjects. © IFMBE: 2005.

National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-28715 (URN)10.1007/BF02345957 (DOI)13884 (Local ID)13884 (Archive number)13884 (OAI)
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2017-12-13
Hult, P., Fjällbrant, T., Hildén, K., Dahlström, U., Wranne, B. & Ask, P.Bioacoustic detection of the third heart sound: a preliminary patient study.
Open this publication in new window or tab >>Bioacoustic detection of the third heart sound: a preliminary patient study
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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.

Keywords
Noninvasive, Third heart sound, Wavelet, Heart failure, Heart sounds, Phonocardiogram, Auscultation, Echocardiography
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-86738 (URN)
Available from: 2013-01-02 Created: 2013-01-02 Last updated: 2013-09-26
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