Dobutamine Stress Echocardiography in LF/LG Aortic Stenosis and Wild-type Transthyretin Amyloid Cardiomyopathy

Patients will be investigated with dobutamine stress echocardiography (increasing doses of dobutamine infusion and simulatneous echocardiogarphic evaluation) to assess aortic valve area and projected aortic valve area.