Objectives: We aimed to analyze the mortality and morbidity associated with congenital heart surgery in Japan. Methods: Data on congenital heart surgeries performed between January 2017 and December 2018 were obtained from Japan Cardiovascular Surgery Database. The 20 most frequent procedures were selected, and mortalities and major morbidities associated with the procedures were analyzed. All procedures were classified into Society of Thoracic Surgeons-European Association for Cardio-Thoracic Surgery Congenital Heart Surgery mortality categories, and mortalities in each category were also analyzed. Results: The mortality rates in atrial septal defect repair and ventricular septal repair were 0% and 0.2%, respectively. The mortality rates in more complex cases (tetralogy of Fallot repair, complete atrioventricular repair, bidirectional Glenn, and total cavopulmonary connection) were 2%–3%. The mortality rates in systemic-to-pulmonary shunt, total anomalous pulmonary venous connection repair, and the Norwood procedure were 4.9%, 11.1%, and 15.7%, respectively, which were not different from those reported in 2015–2016. The mortalities according to the Society of Thoracic Surgeons-European Association for Cardiothoracic Surgery categories 1–5 were 0.3%, 2.7%, 2.9%, 5.9%, and 15.5%, respectively, and comparable to those of the Society of Thoracic Surgeons database (2013–2016). Conclusion: The mortality rates and frequency of complications in major surgical procedures for congenital heart disease in Japan in 2017–2018 will play an important role as a basis for trends in Japan and for comparison with results from other countries.
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