Template:Prolonged QT DDX

Prolonged QT interval

• Electrolyte abnormalities
  • Hypokalemia
  • Hypomagnesemia
  • Hypocalcemia
• Inherited channelopathies
  • Long QT syndrome (Romano-Ward, Jervell and Lange-Nielsen)
  • Brugada syndrome
• Medications
  • Antiarrhythmics (sotalol, amiodarone, procainamide, quinidine, flecainide, dofetilide)
  • Antipsychotics (haloperidol, droperidol, ziprasidone, quetiapine)
  • Antibiotics (macrolides, fluoroquinolones, azole antifungals)
  • Antiemetics (ondansetron, metoclopramide)
  • Methadone
  • Tricyclic antidepressant overdose
  • Sumatriptan
• Cardiac
  • Myocardial ischemia
  • Myocarditis
  • Cardiomyopathy
  • Bradycardia (any cause)
• Metabolic/Endocrine
  • Hypothyroidism
  • Hypothermia
  • Anorexia nervosa
  • Starvation/liquid protein diets
• Neurologic
  • Subarachnoid hemorrhage
  • Stroke
  • Raised intracranial pressure
• Other
  • Organophosphate toxicity
  • Gitelman syndrome
  • Bartter syndrome