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A s soon as a stoma is constructed, a potential site of weakness in the abdominal wall is instantly produced. Parastomal hernia occurs when weakness in the abdominal wall is sufficient to permit abdominal contents, usually the intestine, to protrude through the fascial defect around the stoma and into the subcutaneous tissue, creating a bulge on the abdomen. Parastomal herniation occurs in approximately 30% of all stomas1 and is more common in colostomies than in ileostomies and urostomies.
Peristomal herniation has been attributed to many causes: 1) placement of the stoma outside the rectus sheath, 2) an oversized defect created in the abdominal wall through which the stoma protrudes, 3) increased intra-abdominal pressure, 4) location of the stoma in a midline incision, 5) wound infection at the mucocutaneous border, or 6) poor abdominal muscle tone due to aging and weight gain or loss.2 The progress of a parastomal hernia is often gradual as the area next to the stoma stretches and becomes weaker over time. Every strain (coughing, laughing) or other increase in intra-abdominal pressure (with heavy lifting or strenuous abdominal exercise) causes the area around the stoma to bulge and/or the entire stoma to protrude as it is pushed forward by the intestine behind it.
An analysis of the United Ostomy Association's data registry of 16,470 patients3 found that hernia was the most common complication for patients with stomas located outside the rectus sheath. A small study in Europe found that the placement of the stoma on the abdomen did not influence the rate of para-colostomy hernia.4 Traditional practice, however, seems to support stomal placement through the rectus sheath as an optimal measure to prevent parastomal hernia formation.
As time passes, the size of a hernia will likely increase. These hernias are rarely painful but can be uncomfortable and cause embarrassment if they are large enough to be seen through clothing. Because the uneven abdominal contours around the stoma created by the hernia fluctuate as the hernia alternately protrudes and reduces in response to body movement or changes in intra-abdominal pressure, parastomal hernias can cause serious management problems that result in leakage, skin irritation, and shortened wear time.
Over the years, many surgical approaches to hernia repair have been implemented with the goal of making the abdominal wall tissue fit snugly around the stoma, leaving no weaknesses. Even though this may seem to be the simplest and most logical intervention, it is not always successful. Today, three techniques are currently used for repairing a parastomal hernia:1 1) localized fascial repair, 2) localized fascial repair with mesh, and 3) relocation of the stoma. Surgical options for treating primary large symptomatic parastomal hernias include local repair with mesh implantation and stomal relocation. Stomal relocation is a major surgery with laparotomy and necessitates moving the stoma to another site on the abdomen and repairing the hernia at the old site. Recurrent hernias are best treated by local repair with mesh implantation. The use of mesh over and beyond the weakened area reinforces the weakened muscle structure and spreads the mechanical load over a larger area. Controversy exists regarding which procedure should be used at what point in the progression of the hernia. Some clinicians believe that for first presentation parastomal hernias relocation should be the treatment and that recurrent hernias should be repaired with implantation of mesh.1
1. Efron JE. Ostomies and stomal therapy. American Society of Colon and Rectal Surgeons. Available at: www.fascrs.org. Accessed October 6, 2003.
2. Hampton BG. Peristomal and stomal complications. In: Hampton BG, Bryant RA, eds. Ostomies and Continent Diversions: Nursing Management. St. Louis, Mo.: Mosby Year Book;1992;105-128.
3. Fleshman JW, Lewis MG. Complications and quality of life after stoma surgery: a review of 16,470 patients in the UOA data registry. Seminars in Colon and Rectal Surgery. 1991;2(2):66-72
. 4. Ortiz H, Sara MJ, Armendariz P, deMiguel M, Marti J, Chocarro C. Does the frequency of paracolostomy hernias depend on the position of the colostomy in the abdominal wall? Int J Colrect Dis. 1994;9:65-67.