Postrenal acute kidney injury, also called acute renal failure, occurs when an obstruction in the urinary tract below the kidneys causes waste to build up in the kidneys. It is not as common as intrinsic acute kidney injury (AKI) or acute tubular necrosis (ATN).
A blockage in the urinary tract may cause urine to build up in one or both kidneys. Over time, this fluid buildup can prevent the normal flow of urine out of the kidney. Conditions that may lead to postrenal acute kidney injury include:
Postrenal acute kidney injury requires immediate treatment. When detected early, it usually can be reversed by removing or bypassing the obstruction in the urinary tract, before any permanent damage to the kidneys occurs.
Most people regain normal kidney function if the condition is reversed promptly.
If the obstruction is not relieved, the waste buildup and pressure on the kidneys may damage kidney tissue. Acute kidney injury is much harder to reverse after damage to the kidneys has occurred.
|Primary Medical Reviewer||E. Gregory Thompson, MD - Internal Medicine|
|Specialist Medical Reviewer||Tushar J. Vachharajani, MD, FASN, FACP - Nephrology|
|Last Revised||May 8, 2013|
Last Revised: May 8, 2013
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