Establishment of mitral regurgitation model by a transapical artificial chordae tendineae implantation device in swines
Objective To research the procedure for creating an animal model of mitral regurgitation by implanting a device through the apical artificial chordae tendineae,and to assess the stability and dependability of the device.Methods Twelve large white swines were employed in the experiments.Through a tiny hole in the apex of the heart,the artificial chordae tendineae of the mitral valve was inserted under the guidance of transcardiac ultrasonography.Before,immediately after,and one and three months after surgery,cardiac ultrasonography signs were noted.Results All models were successfully established.During the operation and the follow-up,no swines died.Immediately after surgery,the mitral valve experienced moderate regurgitation.Compared with preoperation,there was a variable increase in the amount of regurgitation and the values of heart diameters at a 3-month follow-up(P＜0.05).Conclusion In off-pump,the technique of pulling the mitral valve leaflets with chordae tendineae implanted transapically under ultrasound guidance can stably and consistently create an animal model of mitral regurgitation.
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