Diastolic dysfunction on previous echocardiogram/catheterization or evidence of abnormal neurohormonal activation (B-type natriuretic peptide (BNP) ≥ 100 pg/ml) with supporting evidence (atrial fibrillation, left atrial enlargement, left ventricular hypertrophy)
History of systemic hypertension
Willing to adhere to provided diet
You may not be if
New York Heart Association Class IV heart failure symptoms
Hospitalization for decompensated heart failure within past one month
Uncontrolled hypertension (seated systolic blood pressure ≥ 180 or diastolic blood pressure ≥ 110) at rest, on current antihypertensive regimen
Changes in medical regimen for heart disease or hypertension within past 1 month, including diuretic dose adjustment
Primary exercise limitation due to severe pulmonary disease
Poor echocardiographic windows
Worse than moderate mitral or aortic stenosis or insufficiency.
Serum potassium level \> 5.0 mmol/L at baseline or prior history of serum potassium level \> 6.0
Serum calcium/phosphorus product \> 50 at baseline
