Safety and Efficacy of Emergent TAVI in Patients With Severe AS

Every patient that diagnosed with severe aortic valve stenosis (evaluated by echocardiography: peak transaortic valve blood flow rate ≥4.0m/s, or mean transaortic valve pressure gradient ≥40mmHg (≥5.32kPa), or aortic Valve area <0.8cm2, or AVA<0.5cm2/m2);

Every patient that 1) required cardiopulmonary resuscitation due to cardiac arrest, or requiring external chest compressions during surgery (Salvage), 2) or has ongoing, refractory (difficult, complicated, and/or unmanageable) unrelenting cardiac compromise, with or without hemodynamic instability, and not responsive to any form of therapy except cardiac surgery (STS/ACC TVT defined "Urgent Status"), 3) or required urgent procedure during same hospitalization in order to minimize chance of further clinical deterioration (examples include, but are not limited to, worsening, sudden chest pain, heart failure, acute myocardial infarction, anatomy, intra-aortic balloon pump, unstable angina with intravenous nitroglycerin or rest angina) (STS/ACC TVT defined "Urgent Status");

Every patient that has been informed of the objectives of the study, agreed to participate, has signed the approved consent form, and was willing to accept all relevant examinations and clinical follow-up.