DVIU stands for direct vision internal urethrotomy, a minimally invasive procedure used to treat urethral strictures. A urethral stricture is a narrowing or scarring inside the urethra (the tube that carries urine out of the body), which can slow or block urine flow. During DVIU, a surgeon inserts a small camera scope into the urethra and makes a precise cut to open the narrowed area, restoring normal flow.
How DVIU Works
The procedure is done endoscopically, meaning no external incisions are needed. A thin scope with a camera is passed through the tip of the penis into the urethra, giving the surgeon a direct view of the stricture. Once the narrowed segment is identified, the surgeon cuts through the scar tissue to widen the channel. This cut can be made with a traditional cold knife blade or with a holmium laser. Both techniques produce similar results: a large analysis of over 3,200 cases found laser urethrotomy had a 74.9% success rate compared to 68.5% for cold knife, but head-to-head trials show no significant difference in recurrence or complication rates.
DVIU is typically performed under general or spinal anesthesia. A urinary catheter is placed after the procedure, and the European Association of Urology recommends removing it within 72 hours if everything goes smoothly.
When DVIU Is Recommended
DVIU works best for short strictures in the bulbar urethra, the section that runs beneath the pelvic floor. The American Urological Association’s 2023 guidelines recommend it as a first-line option for bulbar strictures shorter than 2 centimeters, with the highest success rates seen in strictures under 1 centimeter. For strictures longer than 2 centimeters, success rates drop sharply, and a more involved open surgical repair called urethroplasty is generally the better choice.
Location matters as much as length. Strictures in the penile urethra (the portion running through the shaft of the penis) have high recurrence rates after endoscopic treatment. For those, the AUA recommends urethroplasty rather than DVIU. Simple dilation of the urethra, where the narrowed area is stretched open with progressively larger instruments, produces outcomes comparable to DVIU for short strictures, and the two approaches can be used interchangeably.
Success Rates and Recurrence
For a first-time DVIU on a short bulbar stricture, about 72% of patients will not need another procedure. The remaining roughly 28% experience recurrence, meaning the scar tissue reforms and the urethra narrows again. When that happens, repeating the procedure becomes significantly less effective. One study found the success rate dropped to as low as 9% after repeated DVIUs.
This is an important consideration when discussing treatment options with a urologist. If a first DVIU fails, open surgical reconstruction (urethroplasty) generally offers a more durable solution than trying the same procedure again.
Risks and Side Effects
DVIU is considered a low-risk procedure, but complications can occur. The most common issues include:
- Blood in the urine (hematuria): Reported in roughly 2% to 10% of cases depending on the technique used. It typically resolves on its own within a few days.
- Urinary extravasation: Urine leaking outside the urethra into surrounding tissue, occurring in about 3% of cases. This usually heals without additional treatment.
- Erectile dysfunction: About 2.6% of patients report new erectile problems after DVIU. Cutting scar tissue in the penile urethra carries a particular risk because it can damage nearby blood vessels in the erectile tissue, potentially causing venous leakage.
- Urinary tract infection: A possibility whenever instruments are passed through the urethra, though antibiotics given around the time of the procedure help reduce this risk.
Overall complication rates are similar whether the procedure is done with a cold knife or a laser. A Cochrane review comparing DVIU to simple dilation found no significant difference in complication rates between the two approaches either (11% for DVIU versus 14% for dilation).
Recovery After DVIU
Most people go home the same day or the following morning. The catheter placed during surgery stays in for one to three days. You can expect some burning with urination and mild bleeding for a few days after the catheter comes out. Most patients return to normal activities within a week, though strenuous exercise is typically avoided for a bit longer.
Follow-up usually involves monitoring urine flow over the following months to catch any signs of re-narrowing. Some urologists recommend periodic self-catheterization after the procedure, where you pass a thin, clean catheter yourself on a regular schedule to help keep the urethra open as it heals. This approach, called clean intermittent catheterization, has been shown to reduce residual urine volume and lower the risk of urinary tract infections compared to leaving an indwelling catheter in place for longer periods.
DVIU Compared to Urethroplasty
The main alternative to DVIU is urethroplasty, an open surgery that reconstructs the narrowed section of the urethra, sometimes using tissue grafts. Urethroplasty has higher long-term success rates, especially for longer or recurrent strictures, but it involves a longer operation, an external incision, and a more involved recovery. Erectile dysfunction rates after urethroplasty are slightly higher at about 4.9%, compared to 2.6% after DVIU.
For a first-time short bulbar stricture, the choice between DVIU and urethroplasty often comes down to patient preference and how much the stricture is affecting quality of life. DVIU offers a quicker, less invasive option with a reasonable chance of success. If it doesn’t work, urethroplasty remains available as a next step. For longer strictures, strictures in the penile urethra, or strictures that have already come back after a previous DVIU, urethroplasty is the stronger option from the start.