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Living with Long QT syndrome

A heart rhythm condition that can cause fainting, often passed down in families.

Understanding Long QT syndrome

Long QT syndrome is a condition marked by fainting episodes (syncope) and abnormal fast heart rhythms linked to a long QT interval on a heart tracing (ECG).

The inherited forms are caused by changes in genes for heart ion channel proteins. The two major forms are Romano-Ward syndrome (long QT syndrome 1) and Jervell and Lange-Nielsen syndrome.

Signs & symptoms

GARD doesn't list a separate symptom list. Its summary describes these features:

  • Fainting episodes (syncope)
  • Abnormal fast heart rhythms (ventricular arrhythmia)
  • Long QT interval on an ECG

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Your doctor may refer you to a specialist who knows rare conditions.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

  4. Connect with expert centers

    SADS Foundation may keep lists of experts for this condition.

Care & treatment

Care team
A doctor familiar with rare conditions, plus specialists as needed
Expert care
Expert lists: SADS Foundation
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with SADS Foundation
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
Which type of long QT syndrome do I have?
Would genetic testing help our family?
What triggers should I know about, and when should I seek urgent care?

Quick facts

The inherited forms are caused by changes in genes that make heart ion channel proteins. GARD names two major forms, Romano-Ward and Jervell and Lange-Nielsen syndromes.

Also known as: long q-t syndrome; lqt; lqts; prolonged q-t interval syndrome; ventricular arrhythmia associated with long qt syndrome

Patient organizations

Source: NIH GARD · Long QT syndromeGARD ID 27044 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Long QT syndrome.

Explore the Long QT syndrome blog

Explore research for Long QT syndrome

Explore actively recruiting Long QT syndrome studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Long QT syndrome with HealthSpark. Share your city to explore research near you.

  • Recruiting studies from ClinicalTrials.gov
  • Share your city to look for research near you
  • Eligibility is confirmed by the study team

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Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

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