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Finite Element analysis for Edge-to-Edge Technique to Treat Post-Mitral Valve Repair Systolic Anterior Motion

Zhong Q., Zeng W., Huang X., Zhao X.

Acta of Bioengineering and Biomechanics

2014

Vol. 16, no. 4

3--12

Systolic anterior motion of the mitral valve is an uncommon complication of mitral valve repair, which requires immediate supplementary surgical action. Edge-to-edge suture is considered as an effective technique to treat post-mitral valve repair systolic anterior motion by clinical researches. However, the fundamentals and quantitative analysis are vacant to validate the effectiveness of the additional edge-to-edge surgery to repair systolic anterior motion. In the present work, finite element models were developed to simulate a specific clinical surgery for patients with posterior leaflet prolapse, so as to analyze the edge-to-edge technique quantificationally. The simulated surgery procedure concluded several actions such as quadrangular resection, mitral annuloplasty and edge-to-edge suture. And the simulated results were compared with echocardiography and measurement data of the patients under the mitral valve surgery, which shows good agreement. The leaflets model with additional edge-to-edge suture has a shorter mismatch length than that of the model merely under quadrangular resection and mitral annuloplasty actions at systole, which assures a better coaptation status. The stress on the leaflets after edge-to-edge suture is lessened as well.

Left ventricle simulator for surgeons' support

Umezu M., Arita M., Iwasaki K., Shiraishi Y., Tono S., Uchida K.

Biocybernetics and Biomedical Engineering

2002

Vol. 22, no. 4

47-53

The authors have been developing various types of mock circulatory systems to evaluate a performance of artificial organs. Among several attempts, it was indicated that a simulation of the mitral valve region was very difficult due to a complicated shape and movement of the valve. In this paper, a new trial to install a porcine valve into the mock circulatory system is introduced. A fresh porcine valve with papillary muscles and chordae was fixed into the mitral position of the modified Windkessel-type mock circulatory system. To allow direct 3-D observation of the mitral annulus, a digital video camera and a laser displacement sensor were employed. A circulation was generated by a pneumatically-driven artificial ventricle. When a normal circulatory condition (pump rate: 70BPM, Flow: 3L/min) was selected, similar opening and closing motion to the natural mitral valve could be reproduced. Moreover, a diseased condition was made by shifting a position of papillary muscles. After this procedure, an abnormal movement, such as significant leakage, could also be reproduced.