To our knowledge, no study has analysed the impact of the rate of myocardial diffuse fibrosis, non-invasively estimated by ECV, in the risk of LV dysfunction during MR and AR, especially after surgery. The measurement of ECV could become an important tool for risk stratification in left-sided regurgitant VHD. Thus, it would provide an early marker of LV myocardial involvement before the occurrence of global remodeling, might help physicians in surgical decision, and would improve prognosis. This is an innovative original project because it uses modern imaging modalities to answer to a crucial question. The clinical implications would be important because this work would modify the international surgical indications of MR and AR in order to finally improve the prognosis of patients with this frequent heart disease. Moreover, investigators will analyze the genetic factors that can influence the myocardial reaction resulting from these regurgitations, which will improve the quality of this work and offer new future perspectives.