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Inferior vena cava
One of the largest veins in the body, located in the chest; all blood in the lower body (below the heart) travels through this vein which then empties into the right atrium.
INR (or pro-thrombin time)
A blood test that measures how well your blood clots; used to adjust the dose of an anti-coagulant (blood thinner) called warfarin® (coumadin)
Internal jugular vein
A large vein in the neck that carries blood from the head back to the heart and is often used in right heart catheterization