Whether Oliguresis is a Sigh of Acute Renal Failure or Not

Acute Renal Failure is a kind of clinical syndrome. During Acute Renal Failure, the excretion function of kidneys will decline rapidly in several hours or days. GFR (glomerular filtration rate) will reduce to 50% of the normal level and the serum creatinine will rise by 44.2umol/L each day. Once the above abnormalities are presented in short term, it may suggest Acute Renal Failure. Then patients should find out its causation positively.

The main sign of Acute Renal Failure is the rapid decline of renal function in short time: GFR declines to the 50% of normal level or lower than 50% or serum creatinine rise by on average 44.2umol/L a day.

Clinically, Acute Renal Failure can be divided into three different types: oliguria acute renal failure, non-oliguric acute renal failure, high decomposition acute renal failure. 

Oliguresis (less than 400ml each day) and anuria (less than 100ml each day) are the main features of oliguria acute renal failure. In general, oliguria acute renal failure experiences three stages: oliguric stage, aunria and recovery stage. However, some acute renal failure patients don't present oliguresis or anuresis. But their endogenous creatinine clearance rate declines rapidly in a short term and serum urea nitrogen and creatinine rise fast. This type is named as non-oliguric acute renal failure. In addition, when the urine amount reduces, we'd better ensure it is not caused by the bladder paralysis.