What is the medical term for the accumulation of blood in a part due to venous obstruction?

The medical term for the accumulation of blood in a part due to venous obstruction is passive hyperemia. This condition occurs when there is an impediment in venous outflow, resulting in increased blood volume in the affected area. Passive hyperemia can lead to swelling and discoloration of the tissue due to the pooling of blood, which may subsequently affect the health of the surrounding cells and tissue.

Active hyperemia, in contrast, is characterized by increased blood flow to a tissue due to heightened metabolic activity or response to a stimulus, not due to obstruction. Ischemia refers specifically to inadequate blood supply to tissues, which can lead to tissue damage or necrosis, but does not specifically describe a situation involving venous obstruction. Thrombosis involves the formation of a blood clot within a blood vessel, which can cause obstruction and lead to both active and passive hyperemia as a result of the clot’s presence, but it is not the term used to describe the accumulation of blood itself. Thus, passive hyperemia is the most accurate term relating to venous obstruction leading to blood accumulation.