The mechanism of production of the first and second heart sounds is re-examined on the
basis of known physical laws and physiologic experiments of the last decade. A general …

The sound pressure correlates of the second heart sound were studied in 22 patients during
diagnostic cardiac catheterization. Simultaneous right ventricular and pulmonary artery …

The physical examination, that is, inspection, palpation, and auscultation, is as valuable
today as it ever was, even for structures as inaccessible as the heart and pulmonary …

The aortic valve echogram was recorded in open chest dogs simultaneously with aortic flow,
acceleration of flow, aortic and left ventricular pressures, and intracardiac …

The second heart sounds of 26 normal, young males, recorded at the aortic and pulmonary
areas, were analysed for their frequency content by means of the fast Fourier transform. For …

Abstract Changes of the second heart sound are caused by shifting in position and changes
in magnitude of the aortic or pulmonary component, or both. Differences in the magnitude of …

A special electrical contacting device was developed and used to time the relationship
between aortic valve closure and the aortic incisura in closed chest anesthetized dogs. High …

This investigation was designed to determine the echocardiographic correlates of the aortic
and pulmonary components of the second heart sound. Simultaneous recordings of the …

T he term “isovolumetric relaxation period” is probably more correctly substituted for the
older expression “isometric relaxation period.” The duration of this period has been …

The dynamic correlates of the second heart sound were studied by right and left heart
catheterization in 15 subjects with pure aortic valve stenosis and in 6 subjects who had no …