Introduction
A fistulotomy is a common surgical procedure performed to treat an anal fistula. An anal fistula is an abnormal, infected tunnel that connects an infected gland inside the anal canal to an opening on the skin around the anus. This condition usually develops as a result of a previous anal abscess (a collection of pus) that has drained but failed to heal completely. Symptoms include persistent pain, swelling, and a continuous or intermittent discharge of pus or blood from the opening near the anus. A fistulotomy is considered the most effective and definitive treatment for simple anal fistulas, aiming to eradicate the infection, allow the tunnel to heal properly, and prevent recurrence.

Surgical Procedure
A fistulotomy is typically performed as an outpatient procedure under general anesthesia, spinal anesthesia, or local anesthesia with sedation.
During the procedure, the surgeon carefully probes the fistula tract to determine its depth and direction. Once the entire tunnel is identified, the surgeon uses a scalpel or an electrocautery device to cut along the entire length of the fistula, opening it up from the inside anal canal to the outside skin.
The surgeon then cleans out any infected tissue, pus, or debris from the tract. Instead of stitching the wound closed, the opened tract is usually left open to heal from the inside out. This converts the tunnel into an open groove, which gradually fills in with healthy scar tissue over several weeks. In some cases, if the fistula involves a significant portion of the anal sphincter muscle, a different procedure (like placing a seton—a piece of surgical thread) may be used instead of a fistulotomy to avoid muscle damage.

Surgical Risks
General surgical risks include adverse reactions to anesthesia and bleeding during the procedure.

General Complications
Common complications following a fistulotomy include:
– Post-operative pain and discomfort, particularly during and immediately after bowel movements.
– Minor bleeding or bloody discharge from the surgical site for a few weeks as the wound heals.
– Difficulty urinating (urinary retention) temporarily after surgery due to pelvic muscle spasms.

Rare but Serious Complications
– Bowel incontinence: The most significant risk of a fistulotomy is damage to the anal sphincter muscles, which control the release of stool. While rare in simple fistulotomies, damage can lead to a loss of control over gas or stool (incontinence).
– Recurrence: The fistula may return if the tract does not heal completely or if a new infection develops.
– Severe infection or delayed wound healing.

Pre-operative Preparation
– Bowel Preparation: Patients are usually required to use an enema or take a laxative at home a few hours before the surgery to clear the lower rectum of stool.
– Fasting: Do not eat or drink anything for 8 to 12 hours prior to the procedure.
– Medication Review: Discuss all medications with your doctor, especially blood thinners, which may need to be stopped temporarily.

Post-operative Care
Patients generally go home the same day. Pain management is crucial; you will be prescribed pain relievers and possibly stool softeners to make bowel movements less painful. A bulky dressing is usually placed over the wound, which you can remove before your first sitz bath.

Wound Care
– Sitz Baths: This is the most important part of wound care. Soak the anal area in a shallow tub of warm water (sitz bath) for 15 to 20 minutes, 3 to 4 times a day, and especially after every bowel movement. This keeps the wound clean, soothes pain, and promotes healing.
– Keep the Area Dry: After soaking, gently pat the area dry with a clean towel or use a hairdryer on a cool setting. Do not rub.
– Dressings: You may need to wear a small gauze pad or panty liner to absorb the drainage, which is normal as the open wound heals. Change it frequently.

Diet
– Eat a high-fiber diet (plenty of fruits, vegetables, and whole grains) and drink plenty of water (8-10 glasses a day) to ensure soft, bulky stools that are easy to pass.
– Avoid spicy foods, which can irritate the healing wound during bowel movements.
– Take prescribed stool softeners as directed to prevent constipation and straining.

Post-discharge Notes
Complete healing of the open wound can take 4 to 8 weeks.
– Avoid strenuous exercise, heavy lifting, and prolonged sitting for the first few weeks.
– Use a donut cushion if sitting is uncomfortable.
– It is normal to see some blood, pus, or mucus on your dressing or toilet paper for several weeks.
– Contact your doctor immediately if you experience heavy, continuous bleeding, a high fever, severe swelling, inability to urinate, or pain that worsens significantly. Attend your follow-up appointments so the surgeon can monitor the healing process.