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Ileostomy is an intestinal stoma fashioned from the distal small intestine. Although the creation of an ileostomy can be the smallest part of a larger surgery, the stoma can have the most significant physical and psychosocial effect on a patient. Despite an eventual return to a prior quality of life and activity level, body image and sexual function do not change over time. A well-constructed ileostomy can be lifesaving with minimal adverse effect on the quality of life, when constructed after careful counseling of the patient, preoperative planning, excellent technique, and valuable postoperative enterostomal therapy. Even after a well-constructed ileostomy, recognition and prevention of postoperative dehydration due to the liquid output is imperative to prevent pouching problems, electrolyte abnormalities, and even renal failure.
Stoma is derived from the Greek word stomat, meaning mouth or opening. Spontaneous small bowel stomas from abdominal trauma or incarcerated hernias with subsequent survival ensured the possibility of stomas as lifesaving procedures. Although reports of colostomies existed throughout the 18th century with the first report by Littre in 1710, small intestinal stomas were successfully applied more commonly in the 20th century. Baum in Germany recorded the first ileostomy in 1879 in a patient with an obstructing right colon cancer. In 1888 Maydl from Vienna reported on the successful use of exteriorization of a loop of small or large bowel and suspension over the abdominal wall by a rubber rod through a defect in the mesentery.
Both in Europe and the United States the successful role of enterostomy to relieve abdominal distention gained acceptance. Initially, ileostomies, as described by Brown in 1913, were primarily associated with surgical relief from ulcerative colitis, dysentery, tuberculosis, and large bowel obstruction. However, the use of an ileostomy, even for ulcerative colitis, was met with disdain, whereas other procedures, even those involving ileosigmoid anastomoses, were favored. It was not until the 1940s that the justified and inevitable role of an ileostomy in the management of ulcerative colitis was accepted at major institutions. In 1931 Rankin described staged proctocolectomy with ileostomy for the management of ulcerative colitis and polyposis. The initial staged ileostomy was created through a McBurney incision, division of the ileum close to the ileocecal valve, and exteriorization of the proximal end with a clamp on the end for 2 days. Bargen et al., working on Rankin's technique, replaced the clamp with a small drainage catheter in the exteriorized ileostomy. Although he noted immediate convalescence, significant fluid losses from the ileostomy requiring drastic fluid resuscitation were required. Similar fluid and electrolyte losses were noted by Cattell and Sachs and Cave and Nickel, with the latter reporting a 33% mortality following an ileostomy. Despite the initial success, ileostomy creation was associated with significant morbidity due to the peristomal skin irritation from the small bowel effluent. Lahey later described the morbidity and the mortality associated with ileostomies.
Warren and McKittrick of Massachusetts General Hospital reported in 1951 on the outcome of 210 patients with ulcerative colitis managed by an ileostomy between 1930 and 1949. They coined ileostomy dysfunction and characterized it as “cramp-like pain and, paradoxically, increase in the volume of ileostomy discharge,” which in severe cases can lead to emesis and watery diarrhea with significant loss of fluids and electrolytes leading to a shocklike state. Unfortunately, these symptoms were noted in 62% of the patients. They also observed that early dysfunction was due to the peristaltic activity against the rigid abdominal wall, whereas late dysfunction was due to cicatrizing granulation tissue on the serosa of exteriorized ileostomy. Symptomatic relief was achieved with catheter decompression, which was required in a third of all ileostomy patients and in more than half of all patients with ileostomy dysfunction.
Crile and Turnbull summarized ileostomy dysfunction as the sequelae of peritonitis of the protruding ileostomy that causes a functional obstruction. They noted spontaneous maturation over 4 to 6 weeks by eversion of the mucosa to the abdominal wall. Several procedures to combat the serositis, and thus ameliorate ileostomy dysfunction, were proposed: skin grafting the ileostomy as described by Dragstedt et al., fasciocutaneous grafting by Monroe and Olwin, and mucosal grafting by Turnbull and Crile. However, the most technically facile procedure was described by chance by Brooke of the University of Birmingham in 1952 and involved the evagination of the ileal end and suturing of the mucosa to the skin. To this day, the so-called Brooke ileostomy remains the standard technique for constructing an ileostomy.
Although ileostomies were initially used after proctocolectomy (for ulcerative colitis and polyposis) or the relief of obstruction, their use has evolved over the years in numerous disease processes. Etiologies include functional, hemorrhagic, infectious, inflammatory, ischemic, malignant, or mechanical. Their indications are better described by their permanence: permanent, temporary, or protecting, as shown in Table 84.1 .
Type | Surgical Procedure and Disease Process |
---|---|
Permanent | Proctocolectomy with end ileostomy
Total colectomy or proctocolectomy with end ileostomy
|
Temporary | Colectomy with ileostomy
Partial colectomy with ileostomy
|
Diverting | Colorectal anastomosis
Ileal pouch anal anastomosis |
An end ileostomy is usually indicated in situations in which the disease process affects the entire colon and rectum or the functional status of a patient precludes an anastomosis. Currently, a permanent ileostomy is used in the management of severe proctocolitis due to ulcerative colitis or Crohn disease (especially with significant perianal disease), familial adenomatous polyposis (FAP), and functional disorders, such as colonic dysmotility (with poor anorectal function) and neurogenic bowel.
A functional end ileostomy is fashioned after a segmental or total colectomy for a disease process that spares the distal colon or rectum and allows for a delayed reestablishment of intestinal continuity. This is encountered in patients with fulminant or toxic Crohn colitis or ulcerative colitis, Clostridium difficile colitis, uncontrolled lower gastrointestinal bleeding without a clear source, ischemia involving the ileocolic pedicle, or malignant obstruction involving the ascending colon or small bowel in the setting of immunosuppression where an anastomosis may not be prudent.
In some disease processes, a proximal diversion with a loop ileostomy may be necessary as the first of a series of staged interventions or for protection of a distal anastomosis. The role of diverting loop ileostomies have been extensively studied with low anastomoses in rectal cancer and with ileal pouch anal anastomoses.
Diverting loop ileostomies have been used to diminish the complications of a distal anastomotic leak, especially in the pelvis or in high-risk patients. In immunocompromised or malnourished patients, anastomoses that can otherwise be safely performed may also need fecal diversion. Although fecal diversion with an ileostomy may not diminish the risk of an anastomotic leak, the septic complications are significantly diminished and may avoid reoperation.
Loop transverse colostomies were traditionally used for fecal diversion. This trend changed when Williams et al. performed a randomized controlled trial to compare the outcomes of a loop colostomy with a loop ileostomy and demonstrated that the incidence of prolapse, leakage, skin irritation, odor, and surgical site infection at the time of the ostomy closure were significantly lower with a loop ileostomy. Multiple other meta-analyses have confirmed the significantly lower incidence of prolapse with a loop ileostomy and lower chance of wound infection and hernia formation after closure of a loop ileostomy as opposed to a loop colostomy.
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