In normal people, the external jugular vein is not revealed in standing or sitting position, and it is slightly filled when lying down, but it is limited to 2/3 of the distance from the upper edge of the clavicle to the angle of the jaw, if it exceeds the above level or 45 degrees in semi-recumbent position, the jugular vein is filled, distended and full, it is called jugular vein anger, which indicates that the venous pressure is increased and it is abnormal. Jugular vein is the pressure gauge of right atrium, it can reflect the pressure change and volume change of right atrium. Since the right jugular vein is shorter than the left jugular vein and is a direct continuation of the superior vena cava, the right jugular vein can better reflect the pressure changes of the right atrium than the left. Prevention is mainly from the following aspects: 1, prevention and control of streptococcal infection to prevent rheumatic activity caused by respiratory infections and aggravation of the disease. When the patient’s symptoms are not obvious, he can do some light physical activities. Patients with cardiac insufficiency or rheumatic activities should absolutely rest in bed, and all life should be assisted by family members. The patient’s attitude should be kind and avoid adverse stimulation. Many rheumatic heart disease patients are nervous, emotional excitement, prone to sudden tachycardia, increasing the burden on the heart, resulting in cardiac insufficiency. 3, reasonable diet Cardiac insufficiency should control the intake of water, moderate restriction of sodium salt in the diet. Below 10 grams per day is appropriate, do not eat salt cured products. Reduce high-fat diet; slow down the intake of beverages; take diuretics should eat fruits such as bananas, oranges, etc.; abstain from stimulating diet and excitatory drugs; abstain from sexual life. 4, should not be strenuous activities should be regular outpatient follow-up, patients with atrial fibrillation should not be strenuous activities. Surgical treatment should be considered at an appropriate time, and when to proceed should be determined by the doctor according to the specific situation. 5.If tooth extraction or other minor surgery is needed, antibiotics should be used to prevent infection before surgery.