{"nct_id":"NCT05172973","title":"ALLIANCE AVIV: Safety and Effectiveness of the SAPIEN X4 Transcatheter Heart Valve in Failing Aortic Bioprosthetic Valves","status":"RECRUITING","status_verified_date":"2025-05","start_date":"2023-11-22","start_date_type":"ACTUAL","primary_completion_date":"2025-12","primary_completion_date_type":"ESTIMATED","completion_date":"2034-02","completion_date_type":"ESTIMATED","phases":["NA"],"tickers":["EW"]}