Application of the cone-kernel distribution to study the effect of myocardial contractility in the genesis of the first heart sound in dog

Author

Chen, Danmin ; Durand, Louis-Gilles ; Lee, Howard C.

Author_Institution

Lab. of Biomed. Eng., Clinical Res. Inst. of Montreal, Que., Canada

Volume

2

fYear

1995

fDate

20-23 Sep 1995

Firstpage

959

Abstract

In order to examine the effect of myocardial contractility in the production of the first heart sound (S1), the cone-kernel distribution (CKD) was applied to the thoracic S1 in dogs under various cardiac contractile states. The results showed that the dominant components of S1 are highly concentrated in a specific frequency band between 30 and 50 Hz with a horizontal flat or a semi-lunar shape, independent of the myocardial contractile state. There was no systematic increasing frequency component in the signal distributions like that found in the muscle sound. These results suggest that the myocardial contribution in S1 may be absent. However, there is some evidence that the myocardial contribution may be obscured by the other stronger components, and thus cannot be detected by the time-frequency representation (TFR) techniques

Keywords

bioacoustics; biomechanics; cardiology; muscle; 30 to 50 Hz; cardiac contractile states; cone-kernel distribution; dog; first heart sound genesis; myocardial contractility effect; signal distributions; thoracic S1; time-frequency representation techniques; Biomedical engineering; Dogs; Electrical capacitance tomography; Heart; Laboratories; Muscles; Myocardium; Production; Shape; Time frequency analysis;

fLanguage

English

Publisher

ieee

Conference_Titel

Engineering in Medicine and Biology Society, 1995., IEEE 17th Annual Conference

Conference_Location

Montreal, Que.

Print_ISBN

0-7803-2475-7

Type

conf

DOI

10.1109/IEMBS.1995.579380

Filename

579380