The amplitude and intensity of heart sounds were measured at the chest wall in 25 patients with acute myocardial infarction in order to determine what meaningfUl clinical information can be derived from observing the intensity of the heart sounds. During the early period after infarction, the first heart sound (Si), the aortic component of the second heart sound (A2), and the pulmonary componen...

this study represents an intelligence procedure for diagnosis simultaneously avian newcastle disease virus, infection bronchitis virus and influenza using heart sound signal. for this aim, the chickens were divided into four groups. the first group was considered as control samples. the second, third and fourth groups were infected with newcastle disease virus, infection bronchitis and avian in...

Seven patients have been described who developed a third heart sound in association with a paravalvar leak around a Starr-Edwards mitral valve prosthesis. These patients had all had the mitral valve cusps, chordae tendineae, and part of the papillary muscles excised. The presence of a third heart sound in them supports the concept of Potain (I900) that the third heart sound arises by vibrations...

t has long been known that patients with anemia often have cardiac murmurs, especially “innocent” or “flow” systolic murmurs. These murmurs are not related to valvular disease; they are, however, related to alterations of cardiac dynamics. Tachycardia, increased cardiac output, and dilatation of the heart result from a significant drop of the hemoglobin level. Thus, the myocardium is stressed b...

In this paper, we investigate the possibility of using heart sound as a biometric for human identification. The most significant contribution of using heart sound as a biometric is that it cannot be easily simulated or replicated as compared to other conventional biometrics. Our approach consists of a robust feature extraction scheme which is based on cepstral analysis with a specified configur...

15. Castle RF: Variables affecting the splitting of the second heart sound in atrial septal defect. Am Heart J 73: 468, 1967 16. Morrow AG, Sanders RJ, Braunwald E: The nitrous oxide test An improved method for the detection of left to right shunts. Circulation 17: 284, 1958 17. Curtiss El, Reddy PS, O'Toole JD, Shaver JA: Alterations of right ventricular systolic time intervals by chronic pres...

Auscultation of the heart is accompanied by both electrical activity and sound. Heart auscultation provides clues to diagnose many cardiac abnormalities. Unfortunately, detection of relevant symptoms and diagnosis based on heart sound through a stethoscope is difficult. The reason GPs find this difficult is that the heart sounds are of short duration and separated from one another by less than ...

The fourth heart sound was clearly recorded by using the signal averaging method. Furthermore, the simultaneous recording of the Doppler signal with the fourth heart sound was performed. Thus, it was demonstrated that the Doppler signal started after the P wave and followed by the fourth heart sound. In 2 cases, the effect of the double Master's test and taking a bath was studied on the compute...

A method to trigger multigated blood-pool (MGBP) acquisition using both the first and second heart sound has been developed. The heart sound gating (HSG) circuitry identifies, individually, both the first (S1) and second (S2) heart sounds from their timing relationship alone, and provides two trigger points during the cardiac cycle. First heart sound gating may be performed to assess the systol...