Cardiac thrombosis generally refers to the formation of thrombus in the left atrium and left ear area, and is mainly seen in patients with atrial fibrillation. Because of this kind of atrial fibrillation, the rhythm of atrial contraction is irregular, and blood forms eddies and blood flow is slow in the atria, so the problem of intra-atrial thrombus formation can easily occur. The removal of this thrombus is either thrombolysis or surgical treatment. Thrombolysis is the use of thrombolytic drugs, such as urokinase, streptokinase, r-TPA and other thrombolytic drug injections, which can dissolve the thrombus. This method is mainly used for fresh thrombus that has just formed soon, once the thrombus is longer, it can no longer be treated by thrombolysis. The second is surgery. If the thrombus in the atrium is large and affects the blood return to the heart, the thrombus cannot be removed by conservative drug treatment alone, and the thrombus needs to be removed from the heart by open-heart surgery.