Menu Healthy Lifestyle Diseases & Conditions First Aid Symptoms Tests & Procedures Videos Definitions FAQs Long QT syndromeUpdated: 2017-06-13OverviewLong QT syndrome can be inherited or caused by a medication or condition. It often goes undiagnosed or is misdiagnosed as a seizure disorder, such as epilepsy. SymptomsHeartbeats can be so fast and for so long that they trigger a sudden fainting spell, seizure, or even sudden death. TreatmentsTreatment can involve medical devices, surgery, lifestyle changes, or medications, such as beta blockers. © 1998-2022 Mayo Foundation for Medical Education and Research(MFMER). All rights reserved. Terms of Use