The thirteenth-century accomplishments of Chinggis Khan in conquering a swath of the world from modern-day Korea to southern Russia and in invading deep into Europe, and the cultural achievements of his grandson, Khubilai Khan, in China are well-known in world history.
Extra fluid can be removed by kidneys to form urine.When kidneys shut down, the fluids will build up in body, thus leading to swelling. It often cause retention of fluids in legs and feet. In serious case, the lung may be flooded with water. Swelling is one of common symptoms of kidney shutdown.
ARF may lead to permanent loss of kidney function. But if the kidneys are not seriously damaged, they may recover. Chronic renal failure (CRF) is the gradual reduction of kidney function that may lead to permanent kidney failure, or end-stage renal disease (ESRD). You may go several years without knowing you have CRF. (Source: excerpt from Your Urinary System and How It Works: NIDDK).