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Living with Fatal infantile encephalocardiomyopathy

A very rare mitochondrial disease of newborns and infants that affects the brain, heart and muscles.

Understanding Fatal infantile encephalocardiomyopathy

Fatal infantile encephalocardiomyopathy is a very rare mitochondrial disease, also called fatal infantile cytochrome C oxidase deficiency.

It affects the brain, heart and muscles (cardioencephalomyopathy). Mitochondria are the energy centers of cells. It is seen in newborns and infants.

Signs & symptoms

GARD doesn't list a separate symptom list. Its summary describes problems of the heart, brain and muscles.

  • Heart muscle disease
  • Brain and muscle disease

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 brain and nervous system specialists and genetic 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

    United Mitochondrial Disease Foundation and MitoAction may keep lists of experts for this condition.

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Genetic specialists (geneticists)
Expert care
Expert lists: United Mitochondrial Disease Foundation, MitoAction
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 United Mitochondrial Disease Foundation and other patient organizations
  • 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
Is genetic testing available to find the gene involved?
Which specialists should be on my child's care team?
What supportive care is available for my child?

Quick facts

Symptoms usually startNewborn and as an Infant
InheritanceAutosomal Recessive, Mitochondrial

Changes in genes cause it. GARD lists autosomal recessive and mitochondrial inheritance but doesn't name a gene.

GeneticNeurologicalInherited MetabolicMitochondrial

Also known as: cardioencephalomyopathy, fatal infantile, due to cytochrome c oxidase deficiency; fatal infantile cardioencephalomyopathy due to cytochrome c oxidase deficiency; fatal infantile cox deficiency; fatal infantile cytochrome c oxidase deficiency

Patient organizations

Source: NIH GARD · Fatal infantile encephalocardiomyopathyGARD ID 16569 · 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 Fatal infantile encephalocardiomyopathy.

Explore the Fatal infantile encephalocardiomyopathy blog

Explore research for Fatal infantile encephalocardiomyopathy

Explore actively recruiting Fatal infantile encephalocardiomyopathy studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Fatal infantile encephalocardiomyopathy 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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