Present Status of Intracardiac Phonocardiography

Lewis, David H.; Deitz, George W.; Wallace, James D.; Brown, James R.

doi:10.1161/01.cir.18.5.991

Cited by 16 publications

(2 citation statements)

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“…This is good evidence that the tips of the phonocatheters ]&y in the ascending aorta. 12 The phonocatheter inserted through the femoral artery was withdrawn about an inch at a time from the vicinity of the aortic valve and the difference in time of arrival of the heart sound at the two phonocatheter tips was measured in each position. The increase in this difference iu time of arrival with every centimeter that the phonocatheter was drawn back was The one phonocatheter was eventually drawn as far back as the second heart sound could be recorded.…”

Section: Determination Of the Velocity With Which The Second Heart Somentioning

confidence: 99%

Conduction of Cardiovascular Sound Along Arteries

Farber

Purvis

1963

Circulation Research

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The velocity of the transmission of the second heart sound in the thoracic aorta of dogs was measured. The average velocity was found to be 5.7 meters per second. The figure agrees well with the published figures for the pulse wave velocity in the thoracic aorta of dogs. It was shown in humans that the velocity with which the second heart sound is conducted along the carotid artery does not change appreciably with frequency between 25 and 100 cycles per second. The average increase in velocity of 2.7% per half octave increase in frequency is, with 30% probability, due to random errors. The fraction of the energy of a murmur transmitted in the form of a transverse vibration along the abdominal aorta of dogs was estimated from recordings made before and after the transverse motion of the arterial wall was impeded with a clamp. Most of the energy of the murmur was found to be transmitted in the form of a transverse vibration in the aortic wall. It was concluded that most of the energy of cardiovascular sound in arteries is transmitted in a mode which is exactly analogous to the transmission of the pulse wave. Some puzzling features of intravascular sound conduction, such as the apparent transmission of murmurs mainly in the direction of flow, could be explained on this basis.

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Section: Determination Of the Velocity With Which The Second Heart Somentioning

confidence: 99%

Conduction of Cardiovascular Sound Along Arteries

Farber

Purvis

1963

Circulation Research

View full text Add to dashboard Cite

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“…phonokardiographisch nachweisbare akzidentelle Herzgeräusche bei weit geöffneter Gefäßperipherie, niedrigem peripherem Gesamtwiderstand und großem Schlagvolumen auftreten, während sie bei umgekehrtem Verhalten dieser Kreislaufgrößen fehlen. Die Geräusche fanden sich vorwiegend bei Probanden im Jugendalter und jugendlichen Erwachsenenalter, und ihre Entstehung läßt sich wie folgt erklären (28): Bei weit geöffneter Gefäßperipherie fließt bereits während der Systole der größere Teil der aus- (10,20,27,30) in der Pulmonalarterie nachweisbar sind, in der Aorta jedoch fehlen (20). Entscheidend dürften die beiden anderen von Spitzbarth angegebenen Ursachen sein: Die A. pulmonalis ist im Kindes-und Jugendalter weiter als die Aorta, die Unstetigkeit' dadurch größer.…”

Section: Entstehungunclassified