I87: Other disorders of veins

I87.0: Postthrombotic syndrome

Postthrombotic syndrome (PTS) is a condition that can occur as a long-term complication of deep vein thrombosis (DVT), which refers to the formation of a blood clot in a deep vein usually in the leg. PTS typically develops within two years of having DVT. While the exact cause is unknown, PTS can happen when a blood clot damages a vein, leading to increased blood pressure in the affected vein. This increased pressure can cause various symptoms such as leg swelling, leg pain, discoloration in the affected area, and skin sores. The course of the syndrome varies, as it can gradually improve over time, stay the same, or even become worse. It affects the circulatory system and, more specifically, the functionality of veins, their valves, and the flow of blood in these veins.