Prospective Observational Cohort Study of Moderate Aortic Valve Disease

This observational study is following patients with moderate aortic valve disease — a condition where the heart's main outflow valve is narrowed or leaking but not yet severely — to better understand how the condition changes over time. **You may be eligible if...** - You are 18 or older - You have been diagnosed with moderate aortic valve disease (confirmed by echocardiogram/ultrasound) - You are willing to participate and give consent **You may NOT be eligible if...** - Your aortic valve disease is severe, or you are likely to need heart surgery within 6 months - You have already had a catheter-based valve replacement procedure - You have less than 12 months life expectancy due to non-heart illness (such as cancer or organ failure) - You have severe dementia - You are in acute heart or lung crisis - You are already in another randomized study Talk to your doctor to see if this trial is right for you.