What Is Caval - The worm mass interferes with closure of the tricuspid valve and impedes normal fl ow of blood through the right heart, leading to cardiovascular collapse. What is superior vena cava syndrome? Superior vena cava syndrome (svcs) is a group of symptoms that occurs when your superior vena cava is blocked or squeezed. Your superior vena cava is a blood vessel that returns blood from your upper body to your heart.
Your superior vena cava is a blood vessel that returns blood from your upper body to your heart. The worm mass interferes with closure of the tricuspid valve and impedes normal fl ow of blood through the right heart, leading to cardiovascular collapse. Superior vena cava syndrome (svcs) is a group of symptoms that occurs when your superior vena cava is blocked or squeezed. What is superior vena cava syndrome?