Spectroanalytic Evalution of Aortic Prosthetic Valves

Gordon, Richard F.; Najmi, Moosa; Kingsley, Benedict; Segal, Bernard L.; Linhart, Joseph W.

doi:10.1378/chest.66.1.44

Cited by 20 publications

(8 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hylen et al (1969) stated that in ball variance of aortic prosthesis, the high frequency components of the valvular sounds, which were difficult to detect by means of phonocardiography, fell off and the peak frequency of AOS fell below 1300 Hz in 11 cases out of 12 cases of ball variance. Kingsley (1972) and Gordon et al (1974) also reported the detection of malfunctioning aortic prosthesis using an octave hand-analyzer and emphasized the usefulness of sound spectroanalysis.…”

Section: Discussionmentioning

confidence: 99%

Sound Spectroanalytic Diagnosis of Malfunctioning Prosthetic Heart Valve

Kagawa

Nitta

Satoh

et al. 1977

Tohoku J. Exp. Med.

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

Sound Spectroanalytic Diagnosis of Malfunctioning Prosthetic Heart Valve

Kagawa

Nitta

Satoh

et al. 1977

Tohoku J. Exp. Med.

View full text Add to dashboard Cite

“…Phonocardiography was performed with a suction microphone placed at the apex of the heart. Spectroanalysis is a method of evaluating sound emission by monitoring sound frequency and intensity (Waxler et al, 1973;Gordon et al, 1974). It has been used extensively in modem industry to test the function of certain machinery.…”

Section: Methodsmentioning

confidence: 99%

“…It has been used extensively in modem industry to test the function of certain machinery. The function of prosthetic valves can also be evaluated by determining the frequency profile of the opening and closing clicks for each type of prosthetic valve (Gordon et al, 1974). A normally functioning prosthesis will produce opening and closing sounds at specific frequencies, depending upon the individual characteristics of that particular valve.…”

Section: Methodsmentioning

confidence: 99%

“…Valve dysfunction, such as that caused by thrombus formation or tissue ingrowth (Najmi and Segal, 1965;Herr et al, 1967;Hylen et al, 1968Hylen et al, , 1969Hylen et al, , 1970Delman, 1972), will be shown by a lower frequency than expected for that particular valve. Frequency profiles have been established in the laboratory at our institution for Starr-Edwards prosthetic valves with metal (titanium and 'stellite') and non-metal (silastic) poppets (Table 4) (Gordon et al, 1974).…”

Section: Methodsmentioning

confidence: 99%

“…Spectroanalysis is a fairly new technique used to complement the information obtained by echocardiographic and phonocardiographic examination (Winters et al, 1967;Hylen et al, 1969;Waxler et al, 1973;Gordon et al, 1974). This paper compares two types of Starr-Edwards prosthetic aortic valves-one with a metal (titanium or 'stellite') poppet and one with a non-metal (silastic) poppetand shows how spectroanalysis can distinguish between the two valve types and indicate valve dysfunction as well.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Clinical significance of multiple systolic clicks from Starr-Edwards prosthetic aortic valves.

Simon¹,

Kotler²,

Segal³

et al. 1977

Heart

View full text Add to dashboard Cite

The use of echocardiography, phonocardiography, and spectroanalysis has enhanced the ability to detect prosthetic valve dysfunction even before the onset of symptoms in many patients. Reduction in the intensity of the opening and closing clicks and the appearance of new murmurs have been the most frequently reported observations in predicting prosthetic valve dysfunction. Simultaneous echocardiography, phonocardiography, and spectroanalysis were performed on 31 patients with Starr-Edwards prosthetic aortic valves. Eighteen patients had valves with metal (titanium or 'stellite') poppets, and 13 had valves with non-metal (silastic) poppets. In all patients with normally functioning valves with metal poppets, there were multiple systolic clicks on auscultation and confirmed by phonocardiography and spectroanalysis. In none of the patients with non-metal poppets were there clicks other than those associated with the normal opening and closing movements of the poppets. Three of the 18 patients with metal poppets did not manifest multiple systolic clicks, yet the cut-offfrequencies on spectroanalysis for opening and closing clicks in 1 of these patients were normal. Prosthetic valve dysfunction was shown in all 3 patients by cardiac catheterisation or at operation. We conclude that multiple systolic clicks are normal for patients with Starr-Edwards prosthetic aortic valves with metal (titanium or 'stellite') poppets, and that the absence of multiple systolic clicks may indicate prosthetic valve dysfunction even when the cut-off frequencies of the opening and closing clicks are normal.Because of the large number and different types of prosthetic valves, it is essential that the clinician be familiar with the normal characteristics of each type. Spectroanalysis is a fairly new technique used to complement the information obtained by echocardiographic and phonocardiographic examination (Winters et al., 1967;Hylen et al., 1969;Waxler et al., 1973;Gordon et al., 1974). This paper compares two types of Starr-Edwards prosthetic aortic valves-one with a metal (titanium or 'stellite') poppet and one with a non-metal (silastic) poppetand shows how spectroanalysis can distinguish between the two valve types and indicate valve dysfunction as well. Subjects and methods

show abstract

Wavelet analysis of valve closing sound detects malfunction of bileaflet mechanical valve

et al. 2008

View full text Add to dashboard Cite

Several studies have reported the asynchronous closure of normal bileaflet valves (NBVs), resulting in a split in its closing sound; however, the clinical significance of this split has never been studied in malfunctioning bileaflet valves (MBVs). The study comprised 218 valves in 184 patients, including normal monoleaflet valves (n = 10), NBVs (n = 198), and MBVs (n = 10). Valve function was confirmed by cinefluoroscopy prior to analysis of the valve sound by the Morlet continuous wavelet transform (CWT). The split interval (SI) for each heartbeat was measured, and the coefficient of variation (CV) of its mean (valve SI) was calculated as a parameter for the fluctuation of the SI. The CWT of monoleaflet valves showed a single spike, whereas NBVs exhibited a clear split. There was no significant difference in valve SI between the aortic and mitral positions; however, the mean of the CV was significantly greater in the mitral position (n = 90, 0.507 +/- 0.254) than in aortic position (n = 108, 0.353 +/- 0.228, P = 0.000045). The split was not found in six (aortic; three, mitral; three) of ten patients with MBVs. The other four patients had a distinct split, but the CV was significantly lower for MBVs (0.138 +/- 0.105) than for NBVs (0.343 +/- 0.221, P = 0.042). Receiver-operating characteristics analysis demonstrated the cutoff line of the CV to be 0.112 for detecting malfunctioning aortic valves with the highest accuracy of 86.1%. This new system using the Morlet CWT can detect MBVs. It will be a useful modality for screening the function of bileaflet valves.

show abstract

Spectroanalytic Evalution of Aortic Prosthetic Valves

Cited by 20 publications

References 7 publications

Sound Spectroanalytic Diagnosis of Malfunctioning Prosthetic Heart Valve

Sound Spectroanalytic Diagnosis of Malfunctioning Prosthetic Heart Valve

Clinical significance of multiple systolic clicks from Starr-Edwards prosthetic aortic valves.

Wavelet analysis of valve closing sound detects malfunction of bileaflet mechanical valve

Contact Info

Product

Resources

About