**7. Conclusion**

Irrespective of heart failure etiology, functional mitral regurgitation has a significant unfavorable impact on prognosis. The benefits of surgical treatment in functional mitral regurgitation are unclear and thus, resynchronization therapy remains a valuable option in eligible patients. Indications for such treatment should be considered as early as possible, before the development of a severe left ventricular dilatation, a predictor of failure in resynchronization therapy.
