XXIV Replantation and Transplantation of the Canine Larynx

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Abstract
The arterial supply to the canine larynx is adequately supplied from each of the 4 arteries carrying from 60-80% of its capacity. The cranial thyroid artery is significantly larger than the laryngeal artery. Minimum requirements for the survival of an isolated canine larynx can be met if 40% of the total blood flow, or greater, can be maintained. One cranial thyroid artery, which has a laryngeal branch, and 2 cranial laryngeal veins can meet this minimum requirement. Since the laryngeal branch of the cranial thyroid artery is about 50% in its diameter as compared to the cranial thyroid artery the 2 laryngeal arteries could adequately supply the canine larynx. Successful replantation of the canine larynx is contingent upon the method used for small blood vessel anastomoses. Pneumonia is a common complication following surgery. Marsupiali-zation of the infraglottic area provides good egression of the respiratory secretions. This prevents the mucus from pooling into the lower respiratory tract during the rehabilitative period. Immunosuppressive drug (Imuran) appears to control the antigen-antibody phenomena in the homo-transplanted canine larynx.

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