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This article discusses a case of a 2.5-year-old child with undiagnosed long QT syndrome (LQTS) who experienced cardiac arrest during a cochlear implant surgery. The child had a history of breath-holding spells and global developmental delay, but no active treatment was advised. The surgery was uneventful, but the child suddenly became unresponsive in the post-anesthesia care unit and developed torsade de pointes (TdP), a life-threatening arrhythmia. Despite resuscitation efforts, the child ultimately succumbed to refractory cardiogenic shock. The article emphasizes the importance of considering LQTS in pediatric patients with syncope history and avoiding drugs that can prolong the QT interval during the perioperative period. [Extracted from the article]