Personalized, CT-guided Antithrombotic Therapy Versus Lifelong Single Antiplatelet Therapy to Reduce Thromboembolic and Bleeding Events in Non-atrial Fibrillation Patients After Transcatheter Aortic Valve Implantation

"1. With signs of subclinical valve thrombosis on 4D-CT at 3 months after TAVI are switched from SAPT to apixaban. Patients fulfilling the dose reduction criteria according to the drug label, or with a Clinical Frailty Scale ≥4 will receive 2.5mg bid, patients not meeting these criteria will receive a standard dose of 5mg bid.~2. Without signs of subclinical valve thrombosis on 4D-CT at 3 months after TAVI, without another indication for antiplatelet therapy stop their SAPT.~3. Without signs of subclinical valve thrombosis on 4D-CT at 3 months after TAVI with another indication for antiplatelet therapy continue life-long SAPT."