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Several factors influence pulmonary hemodynamics after lung transplantation: reimplantation response, lung rejection reaction and imperfect anastomosis technique. In this experiment, five cases presented marked elevation of mean pulmonary artery pressure at the time or right pulmonary artery occlusion test performed two weeks postoperatively. Left atrial cuff rejection reaction arose in one case in which edema and stenosis of the pulmonary vein outflow tract were evidenced. This finding demonstrated that the changes in pulmonary hemodynamics after transplant suggest the possibility of inducement by left atrial cuff rejection reaction.