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
Hepatic veins syndrome is a condition caused by blockage of the hepatic veins, such as by a blood clot. It presents with a "classical triad" of abdominal pain, ascites, and liver enlargement. It occurs in 1 out of a million individuals. The syndrome can be fulminant, acute, chronic, or asymptomatic. The hepatic veins may be connected with the portal veins in a TIPS procedure. Hepatic veins In human anatomy, the hepatic veins are the veins that drain de-oxygenated blood from the liver into the inferior vena cava. There are usually three upper hepatic veins draining from the left, middle, and right parts