Purpose: to report the surgical repair of mitral regurgitation (MR) using valvuloplasty and a combination of surface-cooling deep hypothermia and low flow cardiopulmonary bypass (CPB) in a small dog. Using a combination of surface-cooling deep hypothermia using ether and low flow CPB, sugery was performed. During the cardiac arrest, cross-clamping time was 50 minutes, pump flow rates were 150 ml/minute, and the lowest esophageal temperature was 19 degrees C. The left 5th intercostal space and left atrium were opened. The first chorda on the posterior commissural side of the anterior leaflet had ruptured and was replaced by a e-PTFE suture (Gore-Tex, CV6). The posterior commissure was plicated using the Kay technique.

Results: 1 year and 2 months post operation, the dog was active and coughing was rare. However, mild mitral regurgitation remained and the dog was treated with enalapril.