HFpEF  Inclusion Criteria:  Clinical signs of heart failure Preserved Left ventricular (LV) Ejection Fraction (EF >= 50%) Structural Heart Diseases on echocardiogram/ N terminal-pro-brain natriuretic peptide > 125ng/l Elevated LV end-diastolic pressure at rest (>15mmHg) or during exertion (>=25mmHg)  No Heart Failure  Inclusion Criteria:  No signs of heart failure Preserved Left ventricular (LV) Ejection Fraction (EF >= 50%) Normal LV end-diastolic pressure at rest (=<15mmHg) and during exertion (<25mmHg)  Exclusion Criteria:  Significant coronary artery stenosis at time of catheterization Acute coronary syndrome or cerebral insult within 1 month of examination more than moderate valvular diseases pregnancy contraindication to cardiac magnetic resonance imaging