Acute renal failure
Urology / / August 12, 2017
(prerenal, renal and postrenal)
Acute renal failure is a pathological condition of the kidneys, in which sharply violated elimination processes of the body's metabolic products.
distinguish prerenal, renal and postrenal form acute renal failure.
prerenal renal failure - always secondary phenomenon associated with a decrease in blood flow through the kidneys.It is known that the kidneys receive more blood than any other institution, - 25% of the cardiac output.Therefore, to reduce the overall blood circulation (blood loss, large loss of body fluids through the gastrointestinal tract) or severe hemodynamic disorders (shock, congestive heart failure) primarily react kidneys.This reaction consists in bringing spasm glomerular arterioles, leading to a decrease in glomerular filtration.Furthermore, by reducing the flow is activated the renin-angiotensin-aldosterone system, which is also accompanied by a decrease in urine output.Reduced renal filtration may reach such an extent that the renal excretory f
postrenal renal failure violation occurs when the urinary tract obstruction.The obstacle can be at any level of the ureteropelvic junction to the external opening of the urethra.This barrier is most often are concretions, clots of blood or mucus, a tumor or tumor metastases.Furthermore, this form of renal injury develops in the ureter (injury during dressing operation), bladder rupture.
When postrenal kidney failure require surgery.It should be noted that the current long postrenal kidney failure due to the constant high pressure in the ureters and pelvis can lead to damage to the tubules and eventually - in renal kidney failure.
Renal renal failure (acute renal tubular necrosis) cause factors directly affecting the renal parenchyma (acute pyelonephritis, thrombosis of renal arteries or veins, nephrotoxic antibiotics, poisoning with acetic acid, mercury, ethylene glycol).The forecast of this type of renal failure is extremely unfavorable.In 50% of cases it is fatal.