Loop diuretics (such as Furosemide) are powerful diuretic agents which are used as a first-line therapy in volume overloaded patients with low ejection fraction heart failure. Despite their widespread use, they can cause severe electrolyte and volume abnormalities contributing to increased morbidity and mortality . These adverse effects are exacerbated even further in heart failure patients with normal ejection fraction since these patients are usually older, have worse renal function and are more susceptible to volume depletion and its effects. The FDA approved Natrecor for Acute Decompensated Heart Failure and did not differ between low ejection fraction and normal ejection fraction heart failure. Given however, the low number of patients with normal ejection fraction heart failure in clinical trials and the paucity of outcome data in these patients, we propose to specifically study them.