What is LQTS?

Long QT Syndrome (LQTS) is a rhythm abnormality in which the Q-T interval is much longer than normal.

The Q-T interval is a measurement of the time it takes the heart to recharge (repolarize) after contracting. LQTS is either inherited or acquired and it is a serious condition that may cause arrhythmias and cardiac arrest.

In this article, you will learn more about:

  • How is LQTS Diagnosed?  
  • Risk Factors
  • Causes of LQTS
  • Symptoms of LQTS
  • Treatments for LQTS
  • Additional Resources
Download or view our patient education handout on LQTS.

How is LQTS Diagnosed?

Dr. Yoo will use a combination of
a physical exam, past medical history, family history
and testing, which may include:

Risk Factors include:

  • past family history of LQTS
  • low sodium levels
  • low potassium levels

Causes of LQTS include:

  • Long QT Syndrome mainly occurs in people who have a family history of Long QT as it is a genetic disorder. 
  • antidepressants
  • antiarrhythmics
  • antihistamines
  • diuretics

Symptoms of LQTS

Although sometimes symptoms
don’t present themselves, they
include:

  • fainting (syncope)
  • sudden cardiac arrest (SCA)
  • seizures

Treatments for LQTS

Treatment for Long QT Syndrome may include:

  • medications such as beta blockers
  • a pacemaker
  • an implantable cardioverter defibrillator (ICD)
  • lifestyle changes that minimize risk of arrhythmias and symptoms

Additional Resources