Feasibility of Continuous Noninvasive Finger Arterial Blood Pressure Measurement for Detection and Staging of Aortic Stenosis

Inclusion Criteria: * o Patients with severe senile degenerative aortic valve stenosis * Clinical team agrees on eligibility including assessment that TAVR is appropriate for the subject * Patients undergoing TAVR via the femoral approach * Patients who normally require a guiding catheter for central aortic pressure monitoring during the TAVR procedure * Patient must be 18 years old or older * Patient, or legally authorized representative, has given consent to be in the study * Patient height and weight are available prior to study * Ability to perform a Nexfin measurement at the left hand side. Exclusion Criteria: * o Patients with contraindications for placement of aortic catheter * Patients with mixed aortic valve disease (aortic stenosis and aortic regurgitation with predominant aortic regurgitation \>3+). * Aortic valve is a congenital unicuspid or congenital bicuspid valve, or is noncalcified * Patients being treated with an intra-aortic balloon pump * Patients less than 40 kg in weight * Female patients of childbearing potential with a known pregnancy * Patient is currently participating in an investigational drug or another device study that clinically interferes with the study endpoints