Isolated Surgical Aortic Valve Replacement in Low Risk AS Patients

To establish the safety and effectiveness of surgical aortic valve replacement (SAVR) in patients with isolated severe, calcific aortic stenosis who are at low surgical risk.

Inclusion Criteria: 1. All study participants must meet the following inclusion criteria 1. Severe, calcific aortic stenosis with the following criteria: * Jet velocity ≥4.0 m/s or mean gradient ≥ 40 mmHg OR * AVA ≤1.0 cm2 or AVA index ≤ 0.6 cm2/m2 Note: Qualifying TTE must be within 90 days prior to randomization AND 2. NYHA class ≥ II OR Exercisee test that demonstrates a limited exercise capacity, abnormal blood pressure response, or arrhythmia OR Asymptomatic patients with LVEF \