Abstract
1. 1. A number of different kinds of prosthesis were inserted in the outflow tract of the right ventricles of fifty dogs. They were observed up to one year after surgery. 2. 2. Woven Teflon ® with its inner surface covered with autogenous pericardium proved the most satisfactory prosthesis. Autogenous pericardium, woven Teflon alone and diaphragmatic fascia follow in order as to their observed satisfactory response. 3. 3. Homogeneous aortas were the easiest to manipulate and satisfactory immediately after the surgery, but were unsatisfactory in the later periods. The application of this graft for clinical use is not recommended. 4. 4. Free transplantations of muscle tissue of diaphragm or chest wall were not satisfactory and have no clinical value. 5. 5. Five out of twenty-one dogs studied electrocardiographically showed evidence of right ventricular hypertrophy, believed caused by pulmonary valvular insufficiency.
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