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Living with Primary dilated cardiomyopathy

A heart muscle disease in which the main pumping chamber enlarges and pumps with less force.

Understanding Primary dilated cardiomyopathy

Dilated cardiomyopathy (DCM) is a disease of the heart muscle that mainly affects the heart's main pumping chamber, the left ventricle.

It is the most common type of cardiomyopathy. The left ventricle becomes enlarged and cannot pump blood with as much force. The heart muscle has trouble contracting, which can lead to irregular heartbeats and blood clots. Over time the heart can weaken and heart failure can occur. It can begin at any time in life.

Signs & symptoms

GARD doesn't list a symptom list for this condition. It describes these effects:

  • Enlarged left pumping chamber
  • Weaker heart pumping
  • Irregular heartbeats (arrhythmia)
  • Blood clots
  • Heart failure over time

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 Team Titin 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
Should I have genetic testing, such as for TTN, and should family members be screened?
How often should my heart function be checked?
What treatments can protect my heart and control rhythm problems?

Quick facts

Symptoms usually startany time in life

The cause is often unknown. Some cases are acquired and about half are inherited or familial. Familial DCM is most often autosomal dominant and is caused by changes in several genes, most commonly TTN (about 20% of cases).

Also known as: cardiomyopathy, dilated; ccm - congestive cardiomyopathy; cocm - congestive cardiomyopathy; congestive cardiomyopathy; congestive dilated cardiomyopathy; dcm

Patient organizations

Source: NIH GARD · Primary dilated cardiomyopathyGARD ID 221 · 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 Primary dilated cardiomyopathy.

Explore the Primary dilated cardiomyopathy blog

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Explore actively recruiting Primary dilated cardiomyopathy studies with HealthSpark.

HealthSpark

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  • Recruiting studies from ClinicalTrials.gov
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  • 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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