This registry is designed to quantify embolic debris capture rate in patients at low surgical risk treated with the Sentinel System during TAVI.

The SENTINEL-LIR Study is a multicenter, prospective registry to observe rate and type of debris capture in subjects at low surgical risk undergoing TAVI to demonstrate the positive effects of the use of the Sentinel System. Histopathology of captured debris from the Sentinel System will be analyzed.

The primary objective is to determine the presence or absence of particles of 7 discreet tissue types: acute thrombus (with or without associated tissue/foreign material), organizing thrombus, valve tissue, arterial wall/necrotic core, calcification, foreign material, and myocardium. Morphometric assessment of the debris (sizes >150 m, >500 m, and >1,000 m).

Patients will be screened for inclusion and exclusion criteria and documents which will have been reviewed and approved by the local Ethics Committee or regulatory authority prior to undergoing any study related exams or procedures.

Fifty (50) subjects will be enrolled in the study from an estimated 6 different sites.

Inclusion Criteria:

1. Severe symptomatic aortic valve stenosis
2. Planned use of Sentinel System
3. Subject planned for transfemoral TAVI with valve system approved by U.S. FDA for low risk patients
4. STS-PROM score of less than 4% and agreement by Heart Team that patients meet criteria for low surgical risk

Exclusion Criteria:

1. Current or recent cerebrovascular accident (stroke, TIA) <6 months
2. Transapical, direct aortic or subclavian TAVI access
3. Carotid stenting or endarterectomy in last 6 weeks
4. Prior aortic valve replacement
5. Concomitant procedure with TAVI such as CABG, PCI, etc.

The study population is comprised of subjects with severe native aortic valve stenosis who meet the commercially approved indications for TAVI and comply with the inclusion/exclusion criteria described below.