What is the definition or description of: venous stasis?

Venous stasis.: Venous stasis is the backup of venous blood flow due to malfunctioning(refluxing) of the venous valves. These valves occur in the superficial , perforator and deep venous systems. When these valves malfunction, the back pressure builds up in the veins leading to venous hypertension and symptoms of leg heaviness, cramping or tiredness. Signs of venous stasis would be varicose veins and swelling.