REPRISE III: Repositionable Percutaneous Replacement of Stenotic Aortic Valve Through Implantation of Lotus™ Valve System - Randomized Clinical Evaluation

• Subject has documented calcific, severe native aortic stenosis with an initial aortic valve area (AVA) of ≤1.0 cm2 (or AVA index of ≤0.6 cm2/m2) and a mean pressure gradient >40 mm Hg or jet velocity >4.0 m/s, as measured by echocardiography and/or invasive hemodynamics

• Subject has a documented aortic annulus size of ≥18 mm and ≤29 mm based on the center's assessment of pre-procedure diagnostic imaging (and confirmed by the Case Review Committee [CRC]) and, for the randomized cohort, is deemed treatable with an available size of both test and control device. For the U.S. Continued Access Study cohort the acceptable aortic annulus size is ≥20 mm and ≤27 mm.

• Subject has symptomatic aortic valve stenosis with New York Heart Association (NYHA) Functional Class ≥ II

• There is agreement by the heart team (which must include a site investigator interventionalist and a site investigator cardiac surgeon) that subject is at high or extreme operative risk for surgical valve replacement (see note below for definitions of extreme and high risk, the required level of surgical assessment, and CRC confirmation) and that TAVR is appropriate. Additionally, subject has at least one of the following.

• Society of Thoracic Surgeons (STS) score ≥8% -OR-

• If STS <8, subject has at least one of the following conditions: Hostile chest, porcelain aorta, severe pulmonary hypertension (>60 mmHg), prior chest radiation therapy, coronary artery bypass graft(s) at risk with re-operation, severe lung disease (need for supplemental oxygen, forced expiratory volume in 1 second [FEV1] <50% of predicted, diffusing capacity of the lungs for carbon monoxide [DLCO] <60%, or other evidence of severe pulmonary dysfunction), neuromuscular disease that creates risk for mechanical ventilation or rehabilitation after surgical aortic valve replacement, orthopedic disease that creates risk for rehabilitation after surgical aortic valve replacement, Childs Class A or B liver disease (subjects with Childs Class C disease are not eligible for inclusion in this trial), frailty as indicated by at least one of the following: 5-meter walk >6 seconds, Katz Assessment of Daily Living (Katz ADL) score of 3/6 or less, body mass index <21, wheelchair bound, unable to live independently, age ≥90 years, other evidence that subject is at high or extreme risk for surgical valve replacement (CRC must confirm agreement with site heart team that subject meets high or extreme risk definition)

• Heart team (which must include a cardiac interventionalist and an experienced cardiac surgeon) assessment that the subject is likely to benefit from valve replacement.

• Subject (or legal representative) understands the study requirements and the treatment procedures, and provides written informed consent.

• Subject, family member, and/or legal representative agree(s) and subject is capable of returning to the study hospital for all required scheduled follow up visits.

• Note: Extreme operative risk and high operative risk are defined as follows: Extreme Operative Risk: Predicted operative mortality or serious, irreversible morbidity risk ≥50% at 30 days; High Operative Risk: Predicted operative mortality or serious, irreversible morbidity risk ≥15% at 30 days. Risk of operative mortality and morbidity must be assessed via an in-person evaluation by a center cardiac surgeon and must be confirmed by the CRC (which must include an experienced cardiac surgeon).