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Living with Triatrial heart

An extremely rare heart defect present at birth in which there is a small extra chamber above one of the upper heart chambers.

Understanding Triatrial heart

Triatrial heart is an extremely rare heart defect present at birth in which a small extra chamber sits above the left or right atrium.

The heart normally has four chambers. In children, triatrial heart may come with other major heart differences. In adults, it is often found alone.

Signs & symptoms

GARD doesn't list specific symptoms for this condition yet.

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 heart and blood vessel specialists.

  3. Ask which tests can help

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

  4. Connect with expert centers

    Conquering CHD may keep lists of experts for this condition.

Care & treatment

Care team
Heart and blood vessel specialists (cardiologists)
Expert care
Expert lists: Conquering CHD
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 Conquering CHD
  • 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 tests show the extra chamber?
Are there other heart differences, and how are they treated?
Which specialists, such as a pediatric cardiologist, should we see?

Quick facts

GARD doesn't describe a cause for this condition yet.

Also known as: accessory atrium; cor triatriatum; cor triatriatum sinistrum; subdivided left atrium

Patient organizations

Source: NIH GARD · Triatrial heartGARD ID 6194 · 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 Triatrial heart.

Explore the Triatrial heart blog

Explore research for Triatrial heart

Explore actively recruiting Triatrial heart studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Triatrial heart 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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I can help you find recruiting Triatrial heart 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.

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