Medical and Biological Engineering and Computing

, Volume 29, Issue 5, pp 457–464 | Cite as

Discriminationin vitro between the acoustic emissions from Bjork-Shiley convexo-concave valves with and without a broken minor strut

  • D. K. Walker
  • L. N. Scotten
Biomedical Engineering

Abstract

A statistical pattern recognition technique is used to learn and recognise the frequency spectra of the closing sounds emitted by Bjork-Shiley convexoconcave heart valves, with and without fractured minor struts, when operating in vitro. The sounds are generated with test valves operating under a variety of conditions in a model left ventricle. It is found in the learning stage that the discriminant functions generated correctly classified almost all of the cases within the learning set. When applied to cases outside the learning set, including a recording of a clinically implanted valve, the functions correctlyclassify the valves. These preliminary results, for a limited number of valves, lead us to believe that the discriminant analysis of heart valve sounds is a promising noninvasive method for screening patients with implanted Bjork-Shiley convexo-concave valves.

Keywords

Bjork-Shiley valve implants Fracture detection Spectral analysis 

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References

  1. Brochet, E., Bougis de Brux, M. A., Assayag, P., Benacin, Y., Gamerman, G., Guerot, C. andValere, P. E. (1988) Fracture tardive de montant externe d'une valve de Bjork-Shiley position aortique et embolie du disque prothetique.Arch. Mal. Coeur,81 1127–1129.Google Scholar
  2. Brubbak, O., Simonsen, S., Kallman, L. andFredrisen, A. (1981) Strut fracture in the new Bjork-Shiley mitral valve prosthesis.Thorac. Cardiovasc. Surg.,29, 108–109.Google Scholar
  3. Fisher, R. A. (1936) The use of multiple measurements in texonomic problems.Annals. of Eugenics,7, 179–188.Google Scholar
  4. Goerttler, U. andKaiser-Martini, R. (1984) Strut fracture in the Bjork-Shiley mitral valve prosthesis—two case reports.Thorac. Cardiovasc. Surg,32, 320–321.CrossRefGoogle Scholar
  5. Hiratzka, L. F., Kouchoukos, N. T., Grunkemeier, G. L., Miller, D. C., Scully, H. E. andWechsler, A. S. (1988) Outlet strut fracture of the Bjork-Shiley 60 Convexo-Concave valve.J. Am. Coll. Cardiol.,11, 1130–1137.CrossRefGoogle Scholar
  6. IBM Application Program H20-0166-5 (1967) System/360 Scientific Subroutine Package (360A-CM-03X) Version III, Sixth edition, Appendix B 425–429.Google Scholar
  7. Klecka, W. R. andSullivan, J. L. (1980)Discriminant analysis. Sage Publications, Beverly Hills, USA, 07/019.Google Scholar
  8. Koymen, H., Altay, B. K. andIder, Y. Z. (1987) A study of prosthetic heart valve sounds.IEEE Trans. Biomed. Eng.,BME-34, 853–863.Google Scholar
  9. Lindblom, D., Rodriguez, L. andBjork, V. O. (1989) Mechanical failure of the Bjork-Shiley valve. Updated follow-up and considerations on prophylactic replacement.J. Thorac. Cardiovasc. Surg.,97, 95–97.Google Scholar
  10. Montero, C. G., Burgos, R., Rodriguez, J. E. andFiguera, D. (1989) Outlet-strut fracture and disc embolization in 27-mm and smaller Bjork-Shiley convexo-concave valves.Tex. H. Inst. J.,16, 32–35.Google Scholar
  11. Piehler, H. R., Nuhfer, N. J. andJames, S. P. (1988) Evaluation of outlet-strut fractures in Bjork-Shiley 60 convexo-concave tilting disc prothetic heart valves. Symposium on Retrieval and Analysis of Surgical Implants and Biomaterials, Society for Biomaterials. Snowbird, Utah, USA.Google Scholar
  12. Rockelein, G., Breme, J. andvon Der Emde, J. (1989) Lethal blockage of a Bjork-Shiley artificial heart valve caused by strut fracture—the metallurgical aspect.Thorac. Cardiovasc. Surg.,37, 47–51.Google Scholar
  13. Scully, H. E., Damle, A., Goldman, B. S., Tong, C., Azuma, J., Mickelborough, L. L., Schwartz, L. andBaird, R. J. (1988) Clinical performance of Bjork-Shiley mechanical heart valves. A perspective on outlet strut fractures in the 60 and 70 convexo-concave disc models.Can. J. Cardiol.,4, 386–392.Google Scholar
  14. Shawkat, S., Petersen, S. A. andBailey, J. S. (1989) A new technique for the assessment of mechanical prosthetic heart valves: Analysis of their ultrasonic clicks. InSurgery for heart valve disease Bodnar, E. (Ed.), ICR Publishers, London, 96–104.Google Scholar
  15. Stein, P. D., Sabbah, H. N., Albert, D. E. andSnyder, J. E. (1987) Spectral signature of the opening sound of the Bjork-Shiley convexo-concave valve as a potential indicator of strut fracture.Am. J. Noninvas. Cardiol.,1, 369–372.Google Scholar
  16. Taylor, K. (1989) Acute failure of artificial heart valves. The risk is small.Br. J. Noninvas. Cardiol.,1, 369–372.Google Scholar
  17. Taylor, K. (1989) Acute failure of artificial heart valves. The risk is small.Br. Med. J.,297, 996–997.CrossRefGoogle Scholar
  18. Thulin, L. I., Reul, H., Giersiepen, M. andOlin, C. L. (1989) Anin vitro study of prosthetic heart valve sound.Scand. J. Thor. Cardiovasc. Surg.,23, 33–37.Google Scholar
  19. Walker, D. K., Scotten, L. N. andBrownlee, R. T. (1984) New generation tissue valves. Theirin vitro function in the mitral position.J. Thorac. Cardiovasc. Surg.,88, 573–582.Google Scholar

Copyright information

© IFMBE 1991

Authors and Affiliations

  • D. K. Walker
    • 1
  • L. N. Scotten
    • 1
  1. 1.Cardiac Development Laboratory, Royal Jubilee HospitalVivitro Systems Inc.VictoriaCanada

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