Extraction of the aortic and pulmonary components of the second heart sound using a nonlinear transient chirp signal model

2001 ◽  
Vol 48 (3) ◽  
pp. 277-283 ◽  
Author(s):  
Jingping Xu ◽  
L.-G. Durand ◽  
P. Pibarot
Keyword(s):  
Heart Sound ◽  
Chirp Signal ◽  
Signal Model ◽  
Nonlinear Transient ◽  
Second Heart Sound

scholarly journals Electronic Stethoscope Design

2020 ◽  
pp. 10-16
Author(s):  
Mustafa Berkant Selek ◽  
Mert Can Duyar ◽  
Yalcin Isler
Keyword(s):  
Early Diagnosis ◽  
Heart Valve ◽  
Heart Sound ◽  
Late Diagnosis ◽  
Digital Data ◽  
Main Difficulty ◽  
Negative Effects ◽  
Electronic Stethoscope ◽  
Heart Murmurs ◽  
Second Heart Sound

Nowadays, despite the developing technology lots of patients lost their lives because of wrong and late diagnosis. With early diagnosis, most diseases and negative effects of the diseases for the patient can be prevented. Early diagnosis can also prevent cardiological diseases. Although auscultation of the chest with a stethoscope is an effective and basic method, a stethoscope isn't enough for the diagnosis of some diseases. One example of these diseases is heart valve malfunctions when the valves do not work as desired heart murmurs occur. The main goal of this project is to develop an electronic stethoscope and observing obtained signals as a graphic. The main difficulty while auscultation of chest with a stethoscope is, this procedure needs lots of experience and also even tough physician have enough experience, it's very hard to diagnose grade 1 and 2 heart murmurs. Furthermore, while auscultation tachycardia patients, generally it's very hard to decide where the first heart (S1) sound and second heart sound (S2) begins. In this project, it is planned to demonstrate heart sounds as a graphic. This method provides physicians to diagnose all kinds of chest sounds easily even the sounds which they cannot diagnose or recognize with their ears by stethoscope. Moreover, as the chest sounds are obtained as digital data, these data can be sent as desired. When a physician needs to get someone else's idea, these recordings can be sent to another professional.

VARIABLES AFFECTING SPLITTING OF THE SECOND HEART SOUND IN NORMAL CHILDREN

PEDIATRICS ◽  
1969 ◽  
Vol 43 (2) ◽  
pp. 183-191
Author(s):  
Robert F. Castle ◽  
Carol A. Hedden ◽  
N. Park Davis
Keyword(s):  
Heart Rate ◽  
Children And Adolescents ◽  
Supine Position ◽  
Heart Sound ◽  
Second Sound ◽  
Normal Children ◽  
Major Variable ◽  
Second Heart Sound ◽  
Normal Respiration

Phonocardiograms were recorded in a population of normal children and adolescents (116 subjects) in order to evaluate variables which might affect splitting of the second heart sound. Tracings were recorded during normal respiration in supine and sitting positions. Position was the major variable affecting splitting. Eighty-five percent of this population exhibited greater variation in splitting when sitting than while supine. In the remainder of the subjects, the splitting variation was greater in the supine position. Heart rate, sex, age, height, and weight had little or no effect on the splitting pattern of the second sound; 15% of the subjects exhibited fixed splitting of the second sound in either, but not both, the supine and upright positions. This was defined as less than 10 msec variation in splitting during normal respiration. This observation indicates the necessity of assessing the second sound in both supine and upright positions before a judgment is made concerning the existence of an abnormal splitting pattern.

Chirp Signal Model

2020 ◽  
pp. 179-216
Author(s):  
Swagata Nandi ◽  
Debasis Kundu
Keyword(s):  
Chirp Signal ◽  
Signal Model

Second Heart Sound (S2)

2012 ◽  
pp. 115-115
Author(s):  
Achyut Sarkar
Keyword(s):  
Heart Sound ◽  
Second Heart Sound
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