Abstract
The most frequent low back pain syndrome of renal origin is the renal-ureteral colic (RUC), secondary to ureteral lithiasis in 90% of cases. In emergency unit, proper management and the knowledge of complication criteria are mandatory. The pain in RUC and remaining acute renal pathologies is originated by the distention or irritation of the renal capsule. Regarding colic pain, it is caused by the release of vasodilators in response to offset the fall in glomerular filtration rate due to renal hypertension. Complication criteria are: fever, acute renal failure, incoercible pain (despite stepped analgesia) and urinoma. Diagnosis is clinical. If complication is suspected imaging tests are required. Analgesics of choice are nonsteroidal anti-inflammatory drugs. Urgent urinary diversion with ureteral catheter or percutaneous nephrostomy is a priority in complicated cases.
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