In medical settings, CBI stands for continuous bladder irrigation, a procedure that flushes the bladder with a sterile solution to prevent blood clots from forming after urological surgery. It’s one of the most common post-operative treatments following procedures on the prostate or bladder. You may also see “CBI” refer to CBI Health, a Canadian rehabilitation services company, though the clinical meaning is far more common in medical conversations.
How Continuous Bladder Irrigation Works
CBI uses a special three-way catheter (called a Foley catheter) that allows fluid to flow into and out of the bladder at the same time. Unlike a standard catheter that simply drains urine, this version has three separate ports. One sends a sterile saline solution into the bladder, one drains urine and fluid back out into a collection bag, and one inflates a small balloon that holds the catheter in place inside the bladder.
The catheter is designed with a reinforced internal channel that won’t collapse under pressure and large drainage openings that help flush out blood clots. Saline solution flows continuously from a hanging bag, washes through the bladder, and exits into a drainage bag on the other side. Think of it like running water through a pipe to keep it clear. The flow rate is adjusted based on how the drainage looks: if the fluid coming out is dark red or has clots, the flow is increased. As the drainage clears toward a light pink or straw color, the rate is slowed down.
Why CBI Is Used
The most common reason for CBI is to manage bleeding (hematuria) after bladder or prostate surgery. Procedures like transurethral resection of the prostate leave raw tissue surfaces inside the body that bleed during healing. If blood pools in the bladder, it can form clots that block the catheter and cause painful bladder distension. CBI keeps the bladder flushed so clots don’t have a chance to form or accumulate.
CBI may also be used for severe bladder bleeding caused by other conditions, such as bladder cancer, radiation therapy to the pelvic area, or certain infections. In these cases, the goal is the same: prevent clot retention and keep the urinary drainage system working.
What It Feels Like as a Patient
If you’re receiving CBI, you’ll have a catheter in place and be connected to both an irrigation bag (fluid going in) and a drainage bag (fluid coming out). You’ll likely be in a hospital bed, since CBI requires monitoring by nursing staff. The catheter itself can cause a persistent urge to urinate or mild discomfort, and some people experience bladder spasms, which feel like sudden cramping in the lower abdomen. These spasms are a response to the catheter and the fluid filling the bladder, and they’re typically manageable with medication.
You won’t need to do anything during CBI. The system runs on its own with gravity pulling the irrigation fluid in and the drainage fluid out. Nursing staff will check the drainage color regularly, adjust the flow rate, and swap out irrigation bags as they empty. The duration varies depending on how quickly the bleeding resolves. Some people need CBI for 24 hours, others for several days.
How Urine Output Is Tracked
Because a large volume of irrigation fluid is flowing through the bladder alongside your actual urine, healthcare staff use a simple calculation to figure out how much urine your body is producing on its own. They subtract the amount of irrigation fluid infused from the total amount collected in the drainage bag. For example, if the drainage bag contains 5,000 mL at the end of a shift and 4,000 mL of irrigation solution was infused, your true urine output was 1,000 mL. This matters because urine output is one of the key indicators of kidney function, and the irrigation fluid would otherwise mask the real numbers.
Potential Complications
The most common issue during CBI is catheter blockage from blood clots. When this happens, the drainage slows or stops, and the bladder can become distended and painful. Nursing staff may need to manually flush the catheter to clear the blockage. Bladder spasms are also common and can range from mildly uncomfortable to quite painful. Less frequently, CBI can contribute to infection since any catheter creates a pathway for bacteria to enter the urinary tract. Signs like fever, worsening pain, or cloudy drainage that isn’t related to blood are taken seriously.
CBI Health: The Other Meaning
If you searched “CBI medical” looking for a healthcare provider rather than a procedure, you may have been thinking of CBI Health, a Canadian company that operates rehabilitation clinics across the country. CBI Health offers physiotherapy, chiropractic care, massage therapy, occupational therapy, and concussion care. Their services focus on recovery from sports injuries, car accidents, workplace injuries, and chronic pain. The company has locations in communities throughout Canada.