Renal colic


Renal colic is a type of abdominal pain commonly caused by obstruction of ureter from dislodged kidney stones. The most frequent site of obstruction is the vesico-ureteric junction, the narrowest point of the upper urinary tract. Acute obstruction and the resultant urinary stasis can distend the ureter and cause a reflexive peristaltic smooth muscle spasm, which leads to a very intense visceral pain transmitted via the ureteric plexus.

Signs and symptoms

Renal colic typically begins in the flank and often radiates to below the ribs or the groin. It typically comes in waves due to ureteric peristalsis, but may be constant. It is often described as one of the most severe pains.
Although this condition can be very painful, most ureteric stones under 5 mm size will eventually pass into the bladder without needing treatments, and cause no permanent physical damage. The experience is said to be traumatizing due to the severe pain, and the experience of passing blood and clots as well as pieces of stone. In most cases, people with renal colic are advised to drink more water to facilitate passing; in other instances, lithotripsy or endoscopic surgery may be needed. Preventive treatment can be instituted to minimize the likelihood of recurrence.

Diagnosis

The diagnosis of renal colic is same as the diagnosis for the renal calculus and ureteric stones.

Differential diagnosis

The renal colic must be differentiated from the following conditions:
Most small stones are passed spontaneously and only pain management is required. Above the rate of spontaneous stone passage decreases. NSAIDs, such as diclofenac or ibuprofen, and antispasmodics like butylscopolamine are used. Although morphine may be administered to assist with emergency pain management, it is often not recommended as morphine is addictive and raises ureteral pressure, worsening the condition. Vomiting is also considered an important adverse effect of opioids, mainly with pethidine. Oral narcotic medications are also often used.
There is typically no :wikt:antalgic|antalgic position for the patient. Larger stones may require surgical intervention for their removal, such as shockwave lithotripsy, ureteroscopy or percutaneous nephrolithotomy. Patients can also be treated with alpha blockers in cases where the stone is located in the ureter.