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Long QT syndrome

Long QT syndrome is a topic covered in the Diagnosaurus.

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Electrolyte abnormalities

  • Hypokalemia
  • Hypomagnesemia
  • Hypocalcemia
Drugs (selected examples)
  • Class Ia antiarrhythmics (quinidine, procainamide)
  • Class Ic antiarrhythmics (propafenone)
  • Class III antiarrhythmics (amiodarone, bretylium, sotalol)
  • Tricyclic antidepressants
  • Astemizole, terfenadine
  • Antibiotics: erythromycin, trimethoprim-sulfamethoxazole, levofloxacin, ketoconazole, itraconazole
  • Phenothiazines, haldol
  • Prednisone
  • Congenital long QT syndrome
  • Third-degree A-V block
  • Second-degree A-V block
  • Left ventricular hypertrophy (LVH)
  • Myocardial ischemia
  • Significant bradycardia
  • Stroke or subarachnoid hemorrhage
  • Hypothermia

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Last updated: December 1, 2014


Zeiger, Roni F.. "Long QT Syndrome." Diagnosaurus, 4th ed., McGraw-Hill Education, 2014. Emergency Central, emergency.unboundmedicine.com/emergency/view/Diagnosaurus/114580/all/Long_QT_syndrome.
Zeiger RF. Long QT syndrome. Diagnosaurus. 4th ed. McGraw-Hill Education; 2014. https://emergency.unboundmedicine.com/emergency/view/Diagnosaurus/114580/all/Long_QT_syndrome. Accessed April 24, 2019.
Zeiger, R. F. (2014). Long QT syndrome. In Diagnosaurus. Available from https://emergency.unboundmedicine.com/emergency/view/Diagnosaurus/114580/all/Long_QT_syndrome
Zeiger RF. Long QT Syndrome [Internet]. In: Diagnosaurus. McGraw-Hill Education; 2014. [cited 2019 April 24]. Available from: https://emergency.unboundmedicine.com/emergency/view/Diagnosaurus/114580/all/Long_QT_syndrome.
* Article titles in AMA citation format should be in sentence-case
TY - ELEC T1 - Long QT syndrome ID - 114580 A1 - Zeiger,Roni F, Y1 - 2014/12/01/ BT - Diagnosaurus UR - https://emergency.unboundmedicine.com/emergency/view/Diagnosaurus/114580/all/Long_QT_syndrome PB - McGraw-Hill Education ET - 4 DB - Emergency Central DP - Unbound Medicine ER -