EurekaMag.com logo
+ Site Statistics
References:
48,253,228
Abstracts:
22,798,842
+ Resolve Accession
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
EurekaMag PDF Full Text Supply ServicePDF Full Text Supply Service
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
Submit PDF Full TextSubmit PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn
Follow on LinkedInFollow on Tumblr

+ Translate

Spectral signature of the opening sound of the bjork shiley convexoconcave valve as a potential indicator of strut fracture


, : Spectral signature of the opening sound of the bjork shiley convexoconcave valve as a potential indicator of strut fracture. American Journal of Noninvasive Cardiology 1(6): 369-372

The Bjork-Shiley cardiac-valve prosthesis with a 60.degree. opening convexoconcave disc (BSCC) has failed by fracture at the base of the outlet (short) strut in 206 patients as of March, 1987. There are approximately 25,000 29- to 33-mm and 57,600 21- to 27-mm valves implanted worldwide although 57% of fractures were among 9,4000 29- to 33-mm valves manufactured between February 1981 and June 1982. Once mechanical failure of a valve occurs, reoperation is required within hours. It would be useful, therefore, to identify fracture of a strut before complete failure of the valve occurs. For this purpose, we evaluated in vitro the potential of spectral analysis of the prosthetic valve sound as a noninvasive indicator of strut fracture. An intact 29-mm BSCC valve and a normally functioning 29-mm BSCC valve with a through-and-through fracture of the outlet structure at one welding point were examined in the mitral position of a pulse duplicator (pressure 120/80 mm Hg, rate 70/min). Clear differences of the opening sound were observed. The dominant frequency of the opening sound of the intact valve was 234 Hz and the valve with a fractured strut was 78 Hz. A correlation between the frequency spectrum of the opening sound of the two valves was poor (correlation coefficient of 0.22), indicating a marked difference of the spectral signature. These in vitro observations suggest that frequency analysis of the opening sound of BSCC valves has the potential for a noninvasive identification of subclinical strut fracture.

(PDF 0-2 workdays service)

Order PDF Full Text

Close
Close

Click here to order any other PDF Full Text


Accession: 006459920

PDF Full Text: Submit


Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:
Close
Close

Other references

Mjasisceva, N. V.; Areskina, L. Ja.; Kuceva, L. S.; Skorobogatova, E. P., 1968: Cobamide compounds and compounds of folic acid in blood serum in man. Cobamide compounds and folic acid compounds were estimated in serum of 18 patients with acute leucosis or chronic myelosis or lympholeucaemia and in 10 healthy subjects. Cyanocobalamin was quantitatively the most common cobamide compound in serum....

Sreenivasula Reddy, P.; Ramamurthi, R., 1985: Inhibition of acetylcholinesterase activity in Oziotelphusa after a single injection of crustacean neurodepressing hormone. Geobios (Jodhpur): 121: 26-27

Rogers, K. L.; Repenning, C. A., 1997: Paleontology and stratigraphy of Sam Cave, north-central New Mexico. Journal of Vertebrate Paleontology 17(3 SUPPL ): 71A

Krylov N. A.; Mikhaylova M. P., 1980: Coefficient dynamics for effective exploration in platform regions of Turkmenia and Uzbekistan. Neftegazovaya Geologiya i Geofizika 7): 6-10

Alfrey A.C.; Solomons C.C., 1976: The role of pyro phosphate in disturbing calcification mechanisms in uremia. Australian & New Zealand Journal of Medicine 6(1): 96-97

Arison, R. N.; Feudale, E. L., 1967: Induction of renal tumour by streptozotocin in rats. Nature London, 214: 1254-1255

Hundeshagen H., 1988: European nuclear medicine congress milan italy august 29 september 2 1988. European Journal of Nuclear Medicine 14(5-6): 223-330

Ivanov O. K.; Mozzherin Yu V.; Vilisov V. I., 1986: New data on sjogrenite. Izvestiya Akademii Nauk Kazakhskoy SSR, Seriya Geologicheskaya = Khabarlary Kazakh SSR, Fylym Akademiyasynyn 1986(1(287)): 40-45

Golubovskii, MD.; Ivanov, YuN.; Zakharov, IK.; Berg, PL., 1974: Lnvestigation of synchronous and similar changes of the gene pool in geographically separated natural populations of Drosophila melanogaster. Genetika, 104: 72-83

Miller, D. D.; Kearns, J. V.; Skaggs, S. R., 1966: Feeding values of alfalfa cuttings fed to dairy cattle. (New Mexico Agric. Exp. Stat. Bull. No. 504). Hay was made from the first 4 cuttings of lucerne at the one-tenth bloom stage and from second and third cuttings at the bud stage. There was no significant difference among the hays in composition or digestibility. Cows ate significantly less tot...