HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) References Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Add to Personal Folders Download to citation manager Author home page(s): Yoshito Kawachi Kouichi Tokunaga Permission Requests Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Kawachi, Y. Articles by Nakamura, M. Search for Related Content PubMed PubMed Citation Articles by Kawachi, Y. Articles by Nakamura, M.

Ann Thorac Surg 1985;39:456-461
© 1985 The Society of Thoracic Surgeons

---

Articles

In Vivo Hemodynamics of Prosthetic St. Jude Medical and Ionescu-Shiley Heart Valves Analyzed by Computer

From the Division of Cardiovascular Surgery and the Information Science Laboratory for Biomedicine, Kyushu University Faculty of Medicine, Fukuoka, Japan

Accepted for publication September 21, 1984.

^* Address reprint requests to Dr. Kawachi, Division of Cardiovascular Surgery, Kyushu University Faculty of Medicine, Maidashi 3-1-1, Higashi-ku, Fukuoka 812, Japan

Using a method of our own design, we evaluated intraoperatively the function of prosthetic heart valves. The changing hemodynamics induced by a stress test were assessed by simultaneously measuring the mean transvalvular pressure gradient and the stroke volume. The effective orifice area (EOA) of the valves was determined for each stroke by computer analysis, and this value was compared with the actual orifice area. Data were collected from 19 patients undergoing aortic or mitral valve replacement or both with 17 St. Jude Medical and 12 Ionescu-Shiley valves. The mean pressure gradient increased with tachycardia and an increase in mean left atrial pressure in the mitral position, but decreased with a decrease in cardiac output and peak left ventricular pressure in the aortic position. The St. Jude Medical valve had a smaller mean pressure gradient than the Ionescu-Shiley bioprosthesis. For both valves, the EOA increased with valve size. The St. Jude Medical valve had a greater EOA than the Ionescu-Shiley bioprothesis, regardless of the valve size (p < 0.005). However, the performance of prosthetic leaflets was better with the Ionescu-Shiley bioprosthesis than with the St. Jude Medical mechanical valve (p < 0.001). This method involving computer analysis of each cardiac cycle proved to be useful for evaluating prosthetic heart valve function in the presence of changing hemodynamics.

This article has been cited by other articles:

				G. T. Christakis, K. J. Buth, B. S. Goldman, S. E. Fremes, V. Rao, G. Cohen, M. A. Borger, and R. D. Weisel Inaccurate and misleading valve sizing: a proposed standard for valve size nomenclature Ann. Thorac. Surg., October 1, 1998; 66(4): 1198 - 1203. [Abstract] [Full Text] [PDF]

				J. M. Duncan, D. A. Cooley, G. J. Reul, D. A. Ott, G. L. Hallman, O. H. Frazier, J. J. Livesay, W. E. Walker, and P. R. Adams Durability and Low Thrombogenicity of the St. Jude Medical Valve at 5-Year Follow-up Ann. Thorac. Surg., November 1, 1986; 42(5): 500 - 505. [Abstract] [PDF]