Heart and Blood Conditions

Long QT Syndrome Treatment

  • Schedule an appointment +

    • For appointments in Seattle, Bellevue, Everett, Federal Way, Olympia, Tri-Cities and Wenatchee, call 206-987-2515.
    • For appointments in Tacoma and Silverdale, call 253-272-1812.
    • For appointments in Alaska, call 907-339-1945.

    If this is a medical emergency, call 911.

  • Find a doctor +

  • Locations +

    • Seattle Children's Main Campus: 206-987-2515
    • Bellevue Clinic and Surgery Center: 425-454-4644
    • Everett: 425-304-6080
    • South Clinic in Federal Way: 253-838-5878
    • Olympia: 360-459-5009
    • South Sound Cardiology Clinics: 253-272-1812
    • Tri-Cities (Richland): 509-946-0976
    • Wenatchee: 509-662-9266
    • Pediatric Cardiology of Alaska: 907-339-1945
    • Seattle Children's doctors provide many cardiac services at regional sites throughout the Pacific Northwest. See our complete list of Heart Center locations.

  • Refer a patient +

    • If you are a provider, fax a New Appointment Request Form (NARF) (PDF) (DOC) to 206-985-3121 or 866-985-3121 (toll-free).
    • No pre-referral work-up is required for most conditions. If you have already done testing such as an EKG, Holter monitor or echocardiogram, please fax this information as well as relevant clinic notes and the NARF to 206-985-3121 or 866-985-3121 (toll-free).
    • Your patient will be seen as quickly as possible by the provider who is the best match for managing the current problem.
    • View our complete Heart Center Referral Information (PDF).

The goal of treatment for long QT syndrome (LQTS) is to prevent your child’s heart from dangerous irregular and fast heartbeats (arrhythmias). Treatment does not cure LQTS.

Long QT Syndrome Treatment Options

LQTS can be treated with medicines, like beta-blockers. These slow the heart rate and decrease the chance of having dangerous heart rhythms and sudden cardiac arrest by blunting the heart’s reaction to adrenaline.

Some children with LQTS may need a pacemaker or a defibrillator. Read more about these devices and our Arrhythmia Program.

Your doctor may also want your child to avoid things that might trigger an arrhythmia. Common triggers include:

  • Strenuous exercise
  • Certain medicines
  • Conditions that can lower potassium (like diarrhea and vomiting)
  • Loud noises that might startle them during sleep

What triggers your child can be different from other children, so talk with your doctor about it.