Skip to content
knowrare
HealthSignal
Your condition community

Living with Atrial conduction disease

A rare genetic heart rhythm condition with fast or irregular beating in the upper chambers and a weaker heart muscle.

Understanding Atrial conduction disease

Atrial conduction disease is a rare genetic heart condition that causes irregular, fast heartbeats in the upper heart chambers.

Types of rhythm problems include atrial flutter and atrial fibrillation. It also affects the heart's electrical conduction system and raises vulnerability to dilated cardiomyopathy (a stretched, weakened heart muscle). Signs vary and can begin between childhood and adulthood.

Signs & symptoms

GARD lists these among the less common symptoms:

  • Irregular heartbeats in the upper chambers (atrial arrhythmia)
  • Atrial flutter
  • Heart failure

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

    Specialists who may be involved include genetic specialists and heart and blood vessel specialists.

  3. Consider genetic testing

    Changes in TNNI3K are linked to this condition. Genetic testing and counseling can help confirm a diagnosis and explain what it means for your family.

Care & treatment

Care team
Genetic specialists (geneticists); Heart and blood vessel specialists (cardiologists)
Expert care
Ask about multidisciplinary care centers for rare conditions
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 rare disease patient organizations for support
  • 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 heart rhythm tests do I need?
Is a rhythm specialist (electrophysiologist) needed?
Would TNNI3K testing help my relatives?

Quick facts

Symptoms usually startAdult
InheritanceAutosomal Dominant
GenesTNNI3K

GARD says changes in the TNNI3K gene cause this condition. It is autosomal dominant, meaning one changed copy of the gene can be enough to cause it.

Genetic

Also known as: cardiac conduction disease with or without cardiomyopathy 1; cardiac conduction disease with or without dilated cardiomyopathy; familial atrial tachyarrhythmia-infra-hisian cardiac conduction disease

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Atrial conduction diseaseGARD ID 17729 · 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 Atrial conduction disease.

Explore the Atrial conduction disease blog

Explore research for Atrial conduction disease

Explore actively recruiting Atrial conduction disease studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Atrial conduction disease 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

Powered by HealthSpark, our AI chat helper

I can help you find recruiting Atrial conduction disease studies. Enter a ZIP code, address or city below and I'll look within 50 miles.

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

Get Signals for Atrial conduction disease

Stay in the loop with community stories and updates from medical researchers.

HealthStoryfor Atrial conduction disease

Create a living journal that talks back

HealthStory evolves private journaling with a living AI journal that talks back and asks thoughtful questions, helping you capture your Atrial conduction disease experiences more deeply and prepare for better conversations with your doctors and care team.

Start your journal

Your journal is private. Sharing your story publicly is a separate choice, made with Share your story above.