Long QT Syndrome Differential Diagnoses

Updated: Nov 29, 2017
  • Author: Ali A Sovari, MD, FACP, FACC; Chief Editor: Mikhael F El-Chami, MD  more...
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Diagnostic Considerations

Conditions to consider in the differential diagnosis of long QT syndrome (LQTS) include the following:

  • Drug-induced QT prolongation
  • QT prolongation in the course of other diseases (eg, myocardial infarction, cerebral hemorrhage)
  • Syncope
  • Vasovagal syncope
  • Seizures
  • Sudden cardiac death

In otherwise healthy people, causes of syncope, cardiac arrest, or sudden death other than LQTS include hypertrophic cardiomyopathy, Brugada syndrome, and arrhythmogenic right ventricular dysplasia.