The most important factors influencing thromboembolic rates after valv
e replacement are: 1) Cardiogenic factors such as left ventricular fun
ction, left atrial size and atrial rhythm. 2) Prosthesis-related facto
rs such as type of prosthesis, position of prosthesis, and time after
implantation. 3) Patient-related factors such as quality of anticoagul
ation and gender. 4) Conditions with hypercoagulability.