Fast heartbeat after aortic valve surgery may be related to surgical stress, postoperative pain, poor organ function, and damage to the heart. 1. Surgical stress: Surgical stress can lead to excessive release of catecholamines in the body, resulting in rapid heartbeat after surgery. 2. Post-operative pain: Post-operative pain and postural constraints can lead to sympathetic arousal, resulting in a rapid heart rate. 3. Poor organ function: poor respiratory function and lack of oxygen, for example, may cause a fast heartbeat after surgery. 4. Damage to the heart: Due to long-term surgical treatment, the heart can be greatly damaged, causing a fast heartbeat after surgery. It is recommended that patients with fast heartbeat after aortic valve surgery should clarify the cause of the disease and then take active treatment under the guidance of doctors.