Mr Kostolny has been leading the cardiothoracic surgical department at Great Ormond Street Hospital, London since 2015.
He carries out surgery on the whole spectrum of congenital heart disease from complex neonatal surgery to adults with congenital heart defects.
His main areas of clinical interest include aortic valve repair, treatment of pulmonary atresia with multifocal blood supply and complex biventricular repairs.
He holds an honorary appointment with UCL/Institute of Cardiovascular Science as associate professor and his research interest includes surgical outcomes and application of 3D-modeling and virtual reality in treatment of complex congenital heart defects.
Mr Kostolny performs around 250 operations a year in UK and abroad and is co-author in more than 100 publications and book chapters. He is member of several professional bodies and lectures regularly at international meetings.
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