Air embolism and veins is greater than atmospheric pressure, an air embolus does not often happen when a blood vessel is injured. In the veins above the heart, such as in the head and neck, the venous pressure may be less than atmospheric and an injury may let air in. This is one reason why surgeons must be particularly careful when operating on the brain, and why the head of the bed is tilted down when inserting or removing a central venous catheter from the jugular or subclavian veins. When air enters the veins, it travels to the right side of the
Varicose veins insufficiency method (CHIVA), which intends saving the veins, decreases varicose veins and is safer than vein stripping in those with chronic venous insufficiency. CHIVA comes from the French translation for the technique, conservatrice et hémodynamique de l'insuffisance veineuse en ambulatoire. The operation involves performing one to four small incisions on average, under local anesthesia, to remove by precise ligatures abnormal blood flow due to valvular incontinence and responsible for varicose vein dilation. The patient returns home the same day. This method tends to correct the venous functions in order to cure the symptoms of venous insufficiency such as varicose veins,