Background/Purpose: Since the introduction of the closed technique for repair of pectus excavatum, increasing numbers of patients are presenting for surgery. However, controversy exists regarding the effects of repair on long-term cardiopulmonary outcome. This report details the effects over time of closed repair of pectus excavatum on pulmonary function, cardiac function, exercise tolerance, and the patient’s perception of appearance and subjective ability to exercise. Methods: All patients undergoing closed repair of pectus excavatum were evaluated prospectively. Preoperative computed tomography scan, static pulmonary function studies, exercise tolerance, and echocardiographic evaluation of cardiac function were done. Studies were repeated at 3 and 21 months post-bar placement, and then 3 months after bar removal. Results: Pre-and postoperative data were available for an initial 48 patients, with 11 patients completing the full evaluation after bar removal. All measures of pulmonary function including forced expiratory volume in 1 second and forced vital capacity were reduced at 3 months postoperation,with a gradual increase during follow-up; however, pulmonary function remained below normative values for patients without pectus excavatum of similar age. Cardiac function asmeasured by cardiac output and index was increased at 3 months postoperation and maintained thereafter. Exercise tolerance declined initially and then increased by the 21-month evaluation point and after bar removal. Patients reported a subjective improvement in the ability to exercise immediately after bar insertion. Conclusions: These results corroborate previous studies which suggested that after closed repair of pectus excavatum there is an immediate subjective improvement in the ability to exercise which is paralleled by an improvement in cardiac output. However, there is an early postoperative decline in pulmonary function which does improve over time; however, this does not reach normal values for similar weight. Further studies are needed to determine whether these results are maintained, or whether after bar removal there is a further improvement in pulmonary status. These results do support the use of the closed repair of pectus excavatum for maintaining and possibly improving cardiopulmonary function in this patient population. Background / Purpose: Since the introduction of the closed technique for repair of pectus excavatum, increasing numbers of patients are presenting for surgery. However, controversy exists regarding the effects of repair on long-term cardiopulmonary outcome. This report details the effects over time of closed repair of pectus excavatum on pulmonary function, cardiac function, exercise tolerance, and the patient’s perception of appearance and subjective ability to exercise. Methods: All patients undergoing closed repair of pectus excavatum were evaluated prospectively. Preoperative computed tomography scan, static pulmonary function studies , exercise tolerance, and echocardiographic evaluation of cardiac function were done. Studies were repeated at 3 and 21 months post-bar placement, and then 3 months after bar removal. Results: Pre-and postoperative data were available for an initial 48 patients, with 11 patients completing the full evaluation after bar removal. All measures of pulmonary function including forced expiratory volume in 1 second and forced vital capacity were reduced at 3 months postoperation, with a gradual increase during follow-up; however, pulmonary function remained below normative values ​​for patients without pectus excavatum of similar age. Cardiac function asmeasured by cardiac output and index was increased at 3 months postoperation and maintained thereafter. Patients tolerated initially and then increased by the 21-month evaluation point and after bar removal. Patients reported a subjective improvement in the ability to exercise immediately after bar insertion. results corroborate previous studies which suggested that after closed repair of pectus excavatum there is an immediate subjective improvement in the ability to exercise which is paralleled by an improvement in cardiac output. However, there is an early postoperative decline in pulmonary function which does improve over time ; however, this does not reach normal vFurther studies are needed to determine whether these results are maintained, or whether after after bar removal there is a further improvement in pulmonary status. These results do support the use of the closed repair of pectus excavatum for maintaining and possibly improving cardiopiopi function in this patient population.