Morphology of ileal and jejunal pouches used as rectal substitutes.

PURPOSE: Our aim was to determine whether the mucosa of a canine jejunal pouch used as a rectal substitute after proctocolectomy retains its morphologic features better than the mucosa of a canine ileal pouch so used. METHODS: Among ten dogs that underwent proctocolectomy, five had a jejunal pouch-distal rectal anastomosis and five an ileal pouch-distal rectal anastomosis. After six months, the animals were killed, the intestinal pouches and portions of unaltered distal ileum were removed, and a blinded, mucosal morphometric analysis was performed. RESULTS: The mucosa of the jejunal pouches had an overall thickness (mean +/- standard deviation, anterior and posterior walls, 1,300 +/- 140 microm), villous height (286 +/- 46 microm), and crypt depth (790 +/- 77 microm) greater than that of the ileal pouches (920 +/- 170, 208 +/- 47, and 530 +/- 130 microm, respectively; P < 0.05). Moreover, the mucosal thickness of the jejunal pouches was similar to that of the distal ileum proximal to the pouch (1,200 +/- 200 microm; P > 0.05), whereas the mucosal thickness of the ileal pouch was thinner (P < 0.05). CONCLUSIONS: The jejunal mucosa retains its major morphometric features when the jejunum is used as a rectal substitute after proctocolectomy. In contrast, the ileal mucosa atrophies when the ileum is so used.

The spectrum of pneumatosis intestinalis.

HYPOTHESIS: A review of the spectrum of illness associated with pneumatosis intestinalis enables us to identify the probable causes of, the best diagnostic approaches to, and the most appropriate treatments for this condition. DATA SOURCES: A review of all published material in the English language regarding pneumatosis intestinalis was conducted using the PubMed and MEDLINE databases. Any relevant work referenced in those articles and not previously found or published before the limit of the search engine was also retrieved and reviewed. STUDY SELECTION: There were no exclusion criteria for published information relevant to the topic. All of the studies cited in the present review make a point that contributes to the portrayal of this condition. In circumstances in which the same point was made in several different studies, not all were cited herein. DATA EXTRACTION: All published material on pneumatosis intestinalis was considered. Information was extracted for preferentially selected ideas and theories supported in multiple studies. DATA SYNTHESIS: The collected information was organized by theory. CONCLUSIONS: Mucosal integrity, intraluminal pressure, bacterial flora, and intraluminal gas all interact in the formation of pneumatosis intestinalis. Radiography and computed tomography are the best diagnostic tests. Nonoperative management should be pursued in most patients, and underlying illnesses should be treated. When acute complications appear, such as perforation, peritonitis, and necrotic bowel, surgery is indicated.

Reoperation on the abdomen encased in adhesions.

PURPOSE: To determine outcome after lysis of intestinal adhesions, relief of obstruction, closure of fistulas and drainage of abscesses in patients with an abdominal cavity obliterated by chronic postoperative adhesions. METHODS: Among 40 patients with an abdomen encased in dense adhesions after a mean of 5 previous operations, 31 patients also had intestinal obstruction, 25 enteric fistulas and 20 abdominal abscesses. Reoperation was done and outcome assessed from the medical records and by a mailed questionnaire. RESULTS: Only 1 postoperative death occurred, but 24 early complications appeared. At hospital discharge, obstruction, fistula and abscess were completely resolved in all but 3 patients (P <0.001). Only 2 of 16 patients on parenteral nutrition before operation (TPN) still required it (P = 0.004). At late follow-up (mean, 4.6 years) the patients' quality of life (mean score +/- SD, 8.6 +/- 2.1) was similar to that of a healthy control population (9.2 +/- 1.2, P = 0.17). CONCLUSIONS: Reoperation on the abdomen encased in adhesions restores most patients to good health and an excellent long-term quality of life.

Spontaneous intramural small-bowel hematoma: clinical presentation and long-term outcome.

HYPOTHESIS: To review our experience with the treatment of patients with nontraumatic spontaneous intramural small-bowel hematoma. Our hypothesis was that this condition resolves spontaneously in most patients. DESIGN: A retrospective review of the records of 13 patients with nontraumatic spontaneous intramural small-bowel hematoma who presented to Mayo Clinic (Rochester, Minn; Scottsdale, Ariz; and Jacksonville, Fla) between January 1, 1983, and December 31, 2000. SETTING: A tertiary care medical institution. PATIENTS: Mean age at presentation was 64 years (8 men, 5 women). Patients presented with abdominal pain (13 patients), intestinal obstruction (11 patients), and biliary obstruction (1 patient). Mean duration of symptoms was 4 days. Eight patients were receiving anticoagulant therapy (mean international normalized ratio, 11.6). Only 1 patient was anemic at presentation, but 11 patients became anemic during hospitalization. Computed tomography established the diagnosis in all patients. MAIN OUTCOME MEASURES: Short- and long-term outcomes obtained from clinical records and telephone interviews. RESULTS: Single and multiple hematomas were present in 11 patients and 2 patients, respectively. Two patients had an exploratory operation, but no bowel resection was performed. The other 11 patients were managed with bowel rest. Two patients died of sepsis related to their coexisting medical conditions, and 11 patients left the hospital without short-term complications. At follow-up (mean, 35 months), 4 patients had died of unrelated causes, and 7 were alive; none had recurrence of bowel hematoma or intestinal obstruction. CONCLUSION: Nonoperative treatment of spontaneous small-bowel hematoma has a good outcome in most patients.

Use of a colonic pouch as a rectal substitute after rectal excision

Mid or distal rectal resection with straight coloanal anastomosis effectively treats distal rectal cancer and avoids a permanent stoma. However, the straight colonic segment is a poor reservoir for stools, and patients usually experience varying degrees of impaired rectal function after operation, including frequent bowel movements, incontinence, tenesmus, and soiling. In contrast a J-shaped colonic pouch provides an adequate neorectal reservoir after operation. Patients with a colonic pouch-anal canal anastomosis have bowell movements per day than patients with straight colorectal or coloanal anastomosis. Furthermore, the morbility of the colonic pouch is not greater than that of the straight coloanal anastomosis. An important technical aspect of the colonic pouch procedure is that the limbs used to form the pouch must be no longer than 5 to 6 cm. Patients with larger pouches experience emptying difficulties. Also, the level of the anastomosis between the pouch and the anal canal must be no more than 4 cm from the anal verge, again to avoid problems with defecation. With these caveats, the operation should be considered in patients who require excision of the mid and distal rectum for cancer.