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Living with Long QT syndrome 6

A heart rhythm condition with a long QT interval that can cause fainting, usually during exercise or strong emotion.

Understanding Long QT syndrome 6

Long QT syndrome 6 is a heart electrical condition with a long QT interval on an ECG that can lead to dangerous fast heart rhythms.

The usual rhythm problem is torsade de pointes, which often stops on its own and causes fainting. Events typically happen during exercise or emotional stress, less often during sleep, and usually without warning. About half of untreated people with a disease-causing gene change have symptoms, usually one to a few fainting episodes.

Signs & symptoms

Symptoms vary from person to person. GARD lists these:

  • Fainting (syncope)
  • Torsade de pointes (a fast, abnormal heart rhythm)
  • Ventricular fibrillation (a chaotic heart rhythm)
  • Heart stopping to beat (cardiac arrest)

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
Would genetic testing help our family?
What activities or triggers should I avoid?
Should family members have heart rhythm tests?

Quick facts

InheritanceAutosomal Dominant

It is caused by changes in genes linked to long QT syndrome, and it is inherited in an autosomal dominant way. GARD does not name the specific gene in this record.

Also known as: kcne2 long qt syndrome; long qt syndrome caused by mutation in kcne2; long qt syndrome type 6; lqt6

Patient organizations

Source: NIH GARD · Long QT syndrome 6GARD ID 10434 · 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 6.

Explore the Long QT syndrome 6 blog

Explore research for Long QT syndrome 6

Explore actively recruiting Long QT syndrome 6 studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Long QT syndrome 6 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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