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Living with Endocardial fibroelastosis

A heart condition where the inner lining of the heart thickens, mostly in young children.

Understanding Endocardial fibroelastosis

Endocardial fibroelastosis is a heart condition in which the inner lining of the heart (endocardium) thickens, usually in the left lower chamber.

The thickening can make it harder for the heart to work well. It is most often seen in young children and rarely in adults. It can be linked to heart defects present at birth, infection, or gene changes. Symptoms are often seen in newborns.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Stiff heart muscle (restrictive cardiomyopathy)
  • Heart failure
  • Seizures
  • Trouble with thinking and learning (cognitive impairment)
  • Small lower jaw (micrognathia)
  • Undescended testes (cryptorchidism)

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

    Children's Cardiomyopathy Foundation may keep lists of experts for this condition.

Care & treatment

Care team
Heart and blood vessel specialists (cardiologists)
Expert care
Expert lists: Children's Cardiomyopathy 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 Children's Cardiomyopathy 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 this condition does my child have?
Would genetic testing, including the TAZ gene, be helpful?
How will the heart be monitored over time?

Quick facts

Symptoms usually startNewborn

GARD says it can be linked to heart defects at birth, infection, or gene changes. Changes in the TAZ gene cause one inherited form that runs in families.

Also known as: efe; efe - endocardial fibroelastosis; elastomyofibrosis; endomyocardial fibroelastosis

Patient organizations

Broader rare-disease groups

Source: NIH GARD · Endocardial fibroelastosisGARD ID 6336 · 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 Endocardial fibroelastosis.

Explore the Endocardial fibroelastosis blog

Explore research for Endocardial fibroelastosis

Explore actively recruiting Endocardial fibroelastosis studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Endocardial fibroelastosis 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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