A fistula is an abnormal tract between the bowel and another structure. A fistula of the lower bowel (anal fistula) is almost always caused by an abscess. An abscess is caused by an infection in a small gland just inside the anus. The abscess can grow from the anal gland and tunnel to the nearby skin surface. If this tunnel does not heal, a fistula develops. Some conditions or diseases of the bowel can make these infections more likely.
Treatment depends on where the fistula is and how complex it is. Healing a fistula can be a slow and difficult process. The key to healing a fistula is to find the internal opening. It may take a few surgeries to find this opening.
A seton is a string-like material made from silicone or a braided suture. The seton is placed through the entire fistula tract and the ends are tied. The seton may be left in place for any length of time. The body will not absorb it. The purpose is to provide controlled drainage, decrease swelling and allow a scar to form along the tract.
There may be pain. Expect to have normal bowel function with a seton in place.
Once all the swelling is gone, and a strong tract has formed, surgery may then be an option. This is called a staged procedure.
This surgery opens the fistula tract and joins the inner and outer openings. This converts the tunnel to a groove. The groove heals from the inside out.
Endorectal Advancement Flap
This surgery creates a flap from the rectal wall to cover the internal fistula opening. By closing the source of the drainage, the tract and external wound can heal. You will need to eat a low fiber and residue diet after surgery.
This surgery stands for litigation of intersphincteric fistula tract. This surgery is usually done in two-parts. It treats complex or deep fistulas.
First, a seton is placed into the fistula tract to widen the tract over time. In most cases this will take about 4-6 weeks.
Then, you will have surgery to close the tract between the sphincter muscles and the mid portion of this tract. This allows the internal and external openings to collapse and heal.
You may have an open wound. This will depend on your surgery.
Take a sitz bath (sitting in warm water for 10-15 minutes) at least 3-4 times a day and after each bowel movement.
Do not soak the area if you had a LIFT procedure or Advancement Flap. Showering is okay.
Avoid hard wiping of the area for the first few days. Do not use toilet paper. Use alcohol-free baby wipes.
You will have reddish-yellow drainage for at least 7-14 days. Use mini-pads or sanitary pads for your underwear. Drainage will decrease in amount and get lighter in color. Drainage may increase with bowel movements and more activity.
Check your temperature every day for a week.
Change your position often to stay comfortable (sitting to standing to lying down).
You may return to work as soon as you are able.
Do not drive while on narcotic pain medicine.
You can resume sex when you are ready.
Pain after surgery may be mild to severe for the first week. Pain medicine may be prescribed. Follow directions from your pharmacist on how to take this medicine.
While on pain pills, you may need to take a stool softener (docusate sodium) and a bulk fiber laxative such as Metamucil®. This will prevent constipation. You can buy these over the counter. Follow package directions.
You will return to see your doctor in 1-3 weeks.
When to Call
Bright red blood that does not stop with pressure to the area for 10 minutes
Fever over 100.4ºF for 2 readings taken 4 hours apart
Excess or new swelling
Problems having or controlling bowel movements
Signs that your fistula has returned
Trouble passing urine
Who to Call
Digestive Health Center:
(608) 242-2800 or (855) 342-9900
After hours, weekends and holidays ask for the doctor on call. Leave your name and phone number with area code. We will call you back.