• Long QT syndrome (LQTS) is characterized by abnormality in repolarization of the heart leading long QT interval.
  • Long QT can occur due to noise, exercise etc.
  • Long QT syndrome can be present at birth or can be seen in older children.
  • Causes: genetic, medicines, electrolyte imbalance, drugs like antimicrobials, anti-arrhythmic, antipsychotic medicines etc.
  • Classified into various types, most common is Long QT 1.


  • This can lead to abnormal heart beat and can lead to fainting attacks (syncope), palpitation, drowning, sudden cardiac death


  • ECG
  • Holter analysis


General measures

  • Avoiding aggressive exercise
  • Enough intake of potassium, calcium rich diet etc

Drug Treatment

  • Beta blockers, mexiletine

Other treatment measures

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