We present the case of a 48-year-old man referred for a reduced exercise tolerance in whom a bileaflet mitral prolapse (Barlow's disease), associated with flail motion of posterior mitral leaflet and ruptured chordae tendineae and complicated by eccentric severe regurgitation, was incidentally diagnosed. Albeit paucisymptomatic, at echocardiography he showed the signs of LV dysfunction and, accordingly, was underwent surgical mitral valvuloplasty with implantation of the Memo 3D ReChord Ring without complications. We analyzed the changes of echocardiographic parameters of cardiac remodeling from baseline to post operative setting, highlighting the utility of modern imaging tools (strain and myocardial work) in grade to gauge with more sensitivity LV deformation and function in different conditions of pre and afterload and to overcome the limits of ancient ejection fraction. In conclusion, especially LV myocardial work may be a promising and accurate non load dipendent tool to quantify subclinical LV dysfunction, to guide therapeutic decisions and in post-surgical follow up.