Comparative surgical and colonoscopic appearance of colon anastomoses constructed with sutures, staples, and the biofragmentable anastomotic ring.

UNLABELLED: The following animal study was undertaken to compare and assess the endoscopic gross appearance and histology of colonic anastomoses constructed with sutures, staples, and the biofragmentable anastomotic ring (BAR).

METHODS

Three anastomoses--1 BAR, 1 stapled, and 1 sutured--were placed in each of 48 dogs and colonoscopy and anastomotic evaluation were done.

RESULTS

No leaks were found by air insufflation at surgery. Grossly, the BAR had serosal hematomas in 27/48 anastomoses vs 7/48 for stapled and 1/48 for sutured (BAR vs stapled P < 0.0005 and sutured vs stapled P = 0.07). Adhesions were significantly greater for BAR (35/36) and sutured (34/36) compared to stapled (26/36) (BAR vs stapled P = 0.01 and sutured vs. stapled P = 0.04). Colonoscopic exams at days 3, 7, and 28 showed no significant difference among groups with respect to bleeding, ulceration, necrosis, granulation, or contour. Sutured anastomoses were more stenotic (24/31) than stapled (4/31) or BAR (3/31) ones (BAR vs sutured and sutured vs stapled P < 0.005). At 28 days, 10/10 sutured vs 2/10 stapled vs 3/10 BAR were stenotic (BAR vs sutured P = 0.02, sutured vs stapled P = 0.01). Inflammation on histologic exam at 28 days was not significantly different: sutured (12/12), stapled (12/12), or BAR (9/12). Fibrosis was more prominent in sutured (12/12) than in stapled (5/12) or BAR (4/12) anastomoses (BAR vs sutured P = 0.001, sutured vs stapled P = 0.004, and BAR vs stapled P = 1.00). All anastomoses healed primarily without necrosis or obstruction.

CONCLUSIONS

(1) Colonoscopy to evaluate anastomoses can be done safely even in the early post-operative period. (2) The BAR anastomoses had the most serosal hematomas; BAR and sutured had more adhesions than stapled anastomoses; and sutured anastomoses had the most stenosis and fibrosis. None of these differences was of clinical significance.