Assessment of the closing dynamics in Bjork-Shiley mitral prostheses by digital echocardiography: in vitro validation

Author

Pu, Min ; Vandervoort, Pieter M. ; Greenberg, Neil L. ; Bibawy, George A. ; Eberhardt, Allen C. ; Schreck, Stefan ; Thomas, James D.

Author_Institution

Cardiovascular Imaging Center, Cleveland Clinic Found., OH, USA

fYear

1994

fDate

25-28 Sept. 1994

Firstpage

349

Lastpage

352

Abstract

Some Bjork-Shiley Convexo-Concave (BSCC) mitral prostheses may experience outlet strut fracture (OSF) caused by material fatigue which has been shown to be linearly related to disc closing velocity (DCV). The authors examine whether DCV could be estimated by echocardiography (echo) by means of measurement of disc closing time (DCT). 40 hydrodynamic states were simulated in an in vitro model. A velocity sensor mounted on the sewing ring to provided the DCV. DCT was define as the time from the onset of disc closure indicated by digitally stored M-mode echo tracings to the first closure sound as assessed by phonocardiography. DCV (y) was highly correlated inversely with DCT (x), y=-0.16x+57.7, r=-0.88, p<0.001, and positively with disc closing pressure (r=0.94, p<0.001). When clinically validated, echo may be useful to identify patients with potential risk of OSF.<>

Keywords

echocardiography; prosthetics; Bjork-Shiley mitral prostheses; closing dynamics assessment; digital echocardiography; digitally stored M-mode echo tracings; disc closing velocity; first closure sound; hydrodynamic states; in vitro model; in vitro validation; material fatigue; outlet strut fracture; patients at risk identification; phonocardiography; sewing ring; velocity sensor; Cardiology; Echocardiography; Fatigue; Heart valves; Hydrodynamics; In vitro; Prosthetics; Stress; Time measurement; Velocity measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Computers in Cardiology 1994

Conference_Location

Bethesda, MD, USA

Print_ISBN

0-8186-6570-X

Type

conf

DOI

10.1109/CIC.1994.470173

Filename

470173