Slow Continuous Ultrafiltration Using Central vs Peripheral Line: Feasibility of Implementation, Safety and Efficacy in Acute Heart Failure Syndromes.

Inclusion Criteria: * ≥ 18 years * Patients hospitalized with primary diagnosis of acute heart failure defined as ≥ 2 of the following criteria: * Peripheral or sacral edema * Jugular venous distension or venous central pressure \> 10 mmHg * Hepatomegaly or ascites * Pulmonary edema or pleural effusion on x-ray or pulmonary wedge pressure or end-diastolic pressure \> 20 mmHg. * High pro-BNP * Randomization during first 24 hours * Serum creatinine levels \< 3mg/dL, and K \< 6 mmol/L * The patient should be able to communicate with research staff and meet with study procedures. * The patient will signed informed consent. Exclusion Criteria: * Diagnosis of severe aortic stenosis or severe obstruction to the LVOT, tamponade, cardiac hypertrophic or restrictive cardiomyopathy. * Impossibility of venous catheterization * Acute coronary syndrome * Creatinine greater than 3.0 or K greater than 6 mmol/L. * Systolic blood pressure less than or equal to 100 mmHg * Hematocrit greater than 45% * Prior administration of IV vasoactive drugs in the emergency room (ER) * Clinical instability requiring pressors during hospitalization * Sepsis * On or requires renal dialysis.