Accentuated Mitral Regurgitation

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Short case presentation
72 yo female with a history of atrial fibrillation and severe mitral regurgitation after a mitral valve repair. The ring had dehiscence at A1. A cardiac cath did not show any coronary artery disease.

What are the echocardiographic findings?
What is the etiology of the mitral regurgitation?
Why is the mitral regurgitation accentuated during systole?
List are review the reasons for the jet accenuation in this case.