**1. Introduction**

114 Echocardiography – In Specific Diseases

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Transesophageal echocardiography (TEE) has gained its role in perioperative use for congenital heart disease patients, especially with technology improvements in the past decades. It helps with diagnosis confirmation, real-time hemodynamic monitoring, evaluation the successfulness of surgical repair, and surgical planning. The use of intraoperative TEE has major impacts on surgery for congenital heart defects (Randolph et al., 2002). Even with conservative estimates, the financial benefits of TEE in pediatric patients with congenital heart disease are substantial and outweigh its costs (Bettex et al., 2005). In most of the modern cardiac centers, the TEE exam is an essential part of anesthetic management in congenital heart disease surgery.
