The greatest danger of atrial fibrillation is stroke. According to statistics, the incidence of stroke in patients with non-valvular atrial fibrillation is 5.6 times higher than normal, and the incidence of stroke in valvular atrial fibrillation is 17.6 times higher than normal, and the consequences of stroke caused by atrial fibrillation are often more serious. Prevention of stroke in atrial fibrillation and long-term oral anticoagulation is one of the most important therapeutic measures for patients with atrial fibrillation. The reason is that many patients cannot tolerate or do not want to take anticoagulant drugs because of high blood pressure or other reasons. It stops the formation of blood clots at the source. Today we will look at what exactly is left-ear occlusion. The left ear is an ear-shaped sac that extends from the left atrium, and it is very easy to form thrombus in atrial fibrillation. According to research, more than 90% of thrombi in patients with atrial fibrillation originate from the left heart ear. So, if the left ear is blocked to prevent it from becoming a hotbed of blood clots, the problem of blood clots will be solved, right? This is the principle of left ear occlusion. 2.How does left-ear occlusion work? Studies have shown that more than 90% of the blood clots in patients with non-valvular atrial fibrillation come from the left heart ear. Left ear occlusion is a minimally invasive procedure, a minimally invasive intervention that borrows the femoral vein in the thigh as a surgical access point.” The blocking device can be delivered to the left heart ear through a catheter that is inserted into the blood vessel. After the blocking device is fixed, it will act like an open umbrella, “blocking the left heart ear, so that even if a thrombus forms or even falls off after surgery, it can be kept inside the left heart ear, preventing the thrombus from traveling around with the blood in the blood vessel. Thus, the hidden danger of thrombus formation in the left heart ear is eliminated. The whole operation is short, less traumatic and quicker to recover. Moreover, patients only need to take oral anticoagulant drugs for a short period of time after the operation, avoiding the risk of bleeding, inconvenience and economic burden caused by long-term anticoagulant drugs”. In terms of indications, it is most suitable for patients with a history of stroke or a high risk of combined bleeding, and some patients who are intolerant to anticoagulants or unwilling to take anticoagulants. Minimally invasive interventional left-ear occlusion is an option to reduce the risk of stroke in atrial fibrillation. However, it is important to note that the procedure must be fully evaluated by a multidisciplinary team of senior specialists. 4. Is there any risk associated with the procedure? Any surgery has some risk, and left-ear occlusion is no exception. The main risks are: pericardial effusion or cardiac tamponade, air or thrombus embolism, dislodgement of the blocker, vascular injury, etc. Although the incidence is low, the procedure should be fully evaluated before surgery and operated as gently as possible to minimize the risks. Several international clinical studies have demonstrated the effectiveness and safety of left-ear occlusion, and its efficacy is even better than that of oral warfarin. Left ear occlusion can reduce stroke/embolism/cardiovascular mortality by 40%, cardiovascular mortality by 60%, and all-cause mortality by 34%! In other words, in the right patient, left ear block ≈ anticoagulation. Left-ear occlusion is effective in reducing the likelihood of atrial fibrillation embolism and is an effective tool in patients who are not candidates for long-term anticoagulation and in patients who have failed transient rhythm.