Tracheal resection and anastomosis were done on 7 dogs, and a modified procedure to provide optimum first-intention healing, minimum connective tissue proliferation, and optimum epithelialization was used. To test the integrity of the technique at high incision-line tensile forces, 15 to 17 tracheal rings were excised. Excessive tracheal manipulation resulted in an increased amount of lamina propria and submucosa collagenous tissue, increased size and number of blood vessels, and increased leukocytic invasion. Criteria for a successful anastomosis were minimum postoperative coughing, good mucosal apposition and epithelialization, and tracheal lumen diameters that were at least 80% of the preoperative measurement.
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