Long QT Syndrome: LQT3 Variant Presenting in a Bradycardic Newborn

Long QT Syndrome (LQTS) is a rare hereditary canalopathy, characterized by prolonged ventricular repolarization, which can lead to malignant tachyarrhythmias at a young age. Treatment typically involves healthy lifestyle changes and β-blocker therapy. In specific cases, the implantation of an implantable cardioverter defibrillator (ICD) can be an option. In this report, we present the case of a newborn presenting with bradycardia in his initial screening examination, who was subsequently diagnosed with LQTS, specifically variant LQT3, a rare finding.