定義 靜脈曲張

Varicose veins are veins that have become enlarged and twisted. The term commonly refers to the veins on the leg, although varicose veins occur elsewhere. 更多

Varicose veins are veins that have become enlarged and twisted. The term commonly refers to the veins on the leg, although varicose veins occur elsewhere. Veins have leaflet valves to prevent blood from flowing backwards (retrograde). Leg muscles pump the veins to return blood to the heart. When veins become enlarged, the leaflets of the valves no longer meet properly, and the valves don't work. The blood collects in the veins and they enlarge even more. Varicose veins are common in the superficial veins of the legs, which are subject to high pressure when standing. Besides cosmetic problems, varicose veins are often painful, especially when standing or walking. They often itch, and scratching them can cause ulcers. Serious complications are rare. Non-surgical treatments include elastic stockings, elevating the legs, and exercise. The standard surgical treatment is vein stripping to remove the affected veins. Newer surgical treatments are less invasive but have not been tested as thoroughly. Since most of the blood in the legs is returned by the deep veins, and the superficial veins only return about 10%, they can be removed without serious harm. Varicose veins are distinguished from telangiectasias and spider veins, which have similar symptoms and treatment, but do not involve valvular insufficiency. less