pericardial tamponade

A serious condition that occurs when extra fluid or blood builds up in the space between the heart and the pericardium (the sac around the heart). The extra fluid causes pressure on the heart, which keeps it from pumping enough blood to the rest the body. Pericardial tamponade is life-threatening and can lead to shock and organ failure if not treated right away. It may be caused by cancer, infection, chest injury, heart surgery, radiation therapy to the chest, autoimmune disease, and heart, thyroid, or kidney problems. Also called cardiac tamponade.