Assessment of the tilting properties of the human mitral valve during three main phases of the heart cycle: an echocardiographic study

Echocardiography
Daniel VanherckeP R Verdonck

Abstract

In experimental models of the left heart, the mitral valve (MV) is commonly implanted perpendicular to a central axis of the apex/MV. To adapt this to a more correct anatomical model, as well as for further studies of the left ventricle, we created a database of implantation angles of the MV and annulus during three main phases of the heart cycle, based on standard cardiac ultrasound measurements. Twenty-eight patients were studied with the standard cardiac ultrasound equipment. From the apical echo window, an anteroposterior (AP) plane and a perpendicular commisure-commisure (CC) plane were generated during three critical moments in the heart cycle: systole (S); diastole early filling (E); and diastole late filling (A). In both planes, the angles between the annular plane and each mitral leaflet, as well as the angle between a theoretical longitudinal axis through the apex and center of the MV orifice and the mitral annulus plane, were measured with a custom-made application of Matlab R14. We observed an inclination of the angle mitral annulus/central left ventricle axis, with its lowest point in the direction of the aortic valve (AP plane) of 85 degrees+/-7 degrees in systole (S), 88 degrees+/-8 degrees in early diastole (E),...Continue Reading

References

Aug 1, 1992·Journal of the American College of Cardiology·P BrunJ L Dubois-Rande
Dec 1, 1994·Cardiovascular Research·T Steen, S Steen
Sep 1, 1994·Journal of the American College of Cardiology·M StugaardO A Smiseth
May 1, 1996·Medical & Biological Engineering & Computing·P VerdonckR Verhoeven
Sep 25, 1999·The American Journal of Cardiology·K E HarmonH Hosokawa
Dec 4, 2003·Journal of the American Society of Echocardiography : Official Publication of the American Society of Echocardiography·Kirk T SpencerRoberto M Lang

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