The effects of vagus nerve on the heart are mainly as follows: 1. heart rate is slowed down, Ach can inhibit the atrioventricular junctional cell membrane calcium channels, making the atrioventricular junctional cell phase 0 rise faster. 2. cardiac output is reduced, arterial pressure decreases. 3. atrial myocardial induction period is shortened. 4. atrial conduction is slowed down. If you experience dizziness, panic, sweating, or weakness, go to the hospital and have an electrocardiogram and cardiac ultrasound performed. According to the condition under the guidance of the doctor with drugs to control the progress of the disease, to reduce the occurrence of side effects, to develop good habits, low salt, low-fat diet, regular work and rest, do not stay up late.