1983
DOI: 10.1161/01.cir.68.1.42
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Detection of aortic porcine valve dysfunction by maximum entropy spectral analysis.

Abstract: A high-resolution method of spectral analysis, of the class generally called "maximum entropy method," was used in a study of aortic porcine valve closing sounds in 37 patients (

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Cited by 28 publications
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“…
Models of valve sound production [1][2] and cl inical studies [3][4][5][6][7][8] have demon strated that the natural modes of reso nance of biological heart valves increase with calcium deposit and stiffening of the valve leaflets.In the course of ex ploring the potential of spectral analy sis of valve closing sounds for the de tection of valvular degeneration, a method was developed for determining, in dog, the influence of PR interval (PRI) and heart rate (HR) on the spectra of intracardiac and thoracic first and sec ond heart sounds.
METHOD AND ANALYSISA surgical protocol was designed to implant, in dogs, a Medtronic AV sequen tial rate-programmable pacemaker (Model 7005C) and to destroy the AV node with one to four 0.1 ml formaldehyde inj ec tions.After a recovery period of two to three weeks, a second investigation was then set-up to record the following sig nals: the ECG, the intracardiac left ven tricular and aortic pressures, the intra cardiac left ventricular and aortic phonocardiograms (PCGs), two thoracic PCGs and the left ventricular pressure derivative. The thoracic sounds were recorded with two Hewlett-Packard contact microphones (Model 21050A).
…”
mentioning
confidence: 99%
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“…
Models of valve sound production [1][2] and cl inical studies [3][4][5][6][7][8] have demon strated that the natural modes of reso nance of biological heart valves increase with calcium deposit and stiffening of the valve leaflets.In the course of ex ploring the potential of spectral analy sis of valve closing sounds for the de tection of valvular degeneration, a method was developed for determining, in dog, the influence of PR interval (PRI) and heart rate (HR) on the spectra of intracardiac and thoracic first and sec ond heart sounds.
METHOD AND ANALYSISA surgical protocol was designed to implant, in dogs, a Medtronic AV sequen tial rate-programmable pacemaker (Model 7005C) and to destroy the AV node with one to four 0.1 ml formaldehyde inj ec tions.After a recovery period of two to three weeks, a second investigation was then set-up to record the following sig nals: the ECG, the intracardiac left ven tricular and aortic pressures, the intra cardiac left ventricular and aortic phonocardiograms (PCGs), two thoracic PCGs and the left ventricular pressure derivative. The thoracic sounds were recorded with two Hewlett-Packard contact microphones (Model 21050A).
…”
mentioning
confidence: 99%
“…ABSTRACT Models of valve sound production [1][2] and cl inical studies [3][4][5][6][7][8] have demon strated that the natural modes of reso nance of biological heart valves increase with calcium deposit and stiffening of the valve leaflets.…”
mentioning
confidence: 99%