Effect of Dietary Sodium Restriction in the Management of Patients With Heart Failure and Diastolic Dysfunction

"Patients that are eligible and fulfill the inclusion criteria will be invited to participate while hospitalized, and then sign the informed consent form. Then, the dietitian on call will be notified in order to change the dietary map of the patients. The prescription diet for both the intervention and control group will be the same: DIET AS RESEARCH PROTOCOL. PATIENT WILL RECEIVE THE DIET UNTIL DAY \_\_ / \_\_ OR DISCHARGE. PLEASE DO NOT CHANGE IT. This will be combined with the medical staff and with the Nutrition and Dietetics service.~The evaluation of outcomes after hospital discharge will be held in the institution of reference when will be performed clinical evaluation and blood samples collection for neurohormonal activation analysis."