Inclusion Criteria:  Stable HFpEF patients with NYHA Class II-III or elevated BNP ≥100 N=30 (Target: 30). Age: 50 ~ 80 years. ECHO evidence of EF ≥50% and Grade 2 or 3 diastolic dysfunction. Chronic loop diuretic use Currently on beta-blocker  Exclusion Criteria:  Beta blocker was prescribed for treating other cardiac conditions such as atrial fibrillation or coronary artery disease. Heart rate > 100 bpm Recent hospitalization due to HF within 3 months Non-English speaker