In seven chronically instrumented conscious dogs, micromanometers measured left ventricular pressure, and ultrasonic dimension transducers measured left ventricular minor-axis diameter; the latter recording was filtered to examine data between 20 and 100 Hz. Acceptable external heart sounds were recorded with a phonocardiographic microphone in four of the seven dogs. With each dog sedated, intu...

Splitting of the second heart sound in the pulmonary area into two components was first recognized by Potain (1866). In expiration, the two components fuse, while in inspiration delay of pulmonary valve closure (P2) occurs almost invariably in healthy subjects, enabling identification of aortic valve closure (A2) and P2, and hence comparison of the duration of right and left ventricular systole...

Assisting physicians in the auscultation of the patients by providing less costly, automatic and accurate signal processing module for the heart event detection and recognition is of great importance. This paper presents a complete heart sound analysis system covering from the segmentation of beat cycles to the final determination of heart conditions. A basic task for the diseases diagnosis fro...

Right and left atrial pressures with a simultaneous external phonocardiogram and standard lead II electrocardiogram were recorded during routine cardiac catheterization in i5 patients. With one exception, the onset of the second (T1) major component of the first sound coincided with the peak of the right atrial c wavejust as the major left-sided component (M1), previously studied in this labora...

The second heart sounds in 29 cases with right bundle branch block, mainly surgically induced, were studied. Three general types of the second sound were classified. Eleven cases revealed wide splitting of the second sound (0.05 sec. or more), and 14 cases showed narrow splitting less than 0.05 sec.), while 4 cases showed a single 2nd heart sound throughout the respiratory cycle. Ten cases reve...

The analysis of heart sound signals is a basic method for heart examination. It may indicate the presence of heart disorders and provide clinical information in the diagnostic process. In this study, a novel feature dimension reduction method based on independent component analysis (ICA) has been proposed for the classification of fourteen different heart sound types; the method was compared wi...

Phasic right atrial and ventricular pressures and heart sounds were simultaneously recorded from dogs with normal and ectopic ventricular contractions. Heart sounds and electrocardiograms were recorded from humans. The first heart sound is significantly delayed in the absence of atrial systole. The time between onset of the ventricular pressure rise due to ventricular contraction and the beginn...

A phonocardiographic study in a medium frequency range was made over various areas of the precordium in 27 cases of right bundle branch block (RBBB), 28 cases of left bundle branch block (LBBB), and 30 normal subjects of the same age. The various components of the first heart sound plus the pulses at the suprasternal notch and the right carotid artery were studied in regard to timing, relations...

SUMMARY A clinical, electrocardiographic, phonocardiographic, and arteriographic study was made of 20 normal subjects, 20 patients with right bundle-branch block (RBBB) and 20 patients with left bundle-branch block (LBBB). Ventricular asynchronism was documented in nearly all cases of bundle-branch block by the behavior of the arterial pulse and the heart sounds. The first heart sound was of no...