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X-linked dilated cardiomyopathy
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Condition

X-linked dilated cardiomyopathy

X-linked dilated cardiomyopathy is a genetic heart condition that weakens the cardiac muscle, often leading to heart failure, and is caused by mutations in the DMD gene.

Overview

X-linked dilated cardiomyopathy is a form of heart disease where the cardiac muscle becomes enlarged and weakened, preventing the heart from pumping blood efficiently. In males, heart problems typically develop early in life and worsen quickly, often leading to heart failure in adolescence or early adulthood. In affected females, the condition generally appears later in life and progresses more slowly.

Symptoms

  • Irregular heartbeat (arrhythmia)
  • Shortness of breath
  • Extreme tiredness (fatigue)
  • Heart failure

Causes & Risk Factors

This condition results from mutations in the DMD gene, which provides instructions for making a protein called dystrophin. Dystrophin helps stabilize and protect muscle fibers and may play a role in chemical signaling within cells.

In individuals with this condition, mutations preferentially affect the activity of dystrophin in the heart, leading to little or no functional dystrophin in cardiac muscle cells. Consequently, these cells become damaged as the heart muscle repeatedly contracts and relaxes, eventually weakening and dying. Because this condition results from a shortage of dystrophin, it is classified as a dystrophinopathy.

Inheritance

X-linked dilated cardiomyopathy follows an X-linked pattern of inheritance. The DMD gene is located on the X chromosome. Because males have only one X chromosome, a mutation in their only copy of the gene causes more severe, early-onset symptoms. Females have two X chromosomes, so a mutation in one copy usually results in milder heart disease that appears later in life. Fathers cannot pass X-linked traits to their sons.

Frequently Asked Questions

Because it is X‑linked, male relatives are at higher risk, while females may be carriers with milder disease. Genetic counseling should include carrier testing for female relatives, predictive testing for at‑risk male relatives, and discussion of reproductive options such as prenatal testing or pre‑implantation genetic diagnosis.===
Diagnosis typically involves an echocardiogram showing enlarged, weakened heart chambers, followed by cardiac MRI for detailed imaging. Genetic testing for mutations in the DMD gene confirms the diagnosis and distinguishes it from other forms of cardiomyopathy.
Standard heart‑failure therapy—ACE inhibitors or ARBs, beta‑blockers, and mineralocorticoid receptor antagonists—helps improve symptoms and survival. Avoid excessive alcohol, maintain a low‑sodium diet, limit strenuous exercise, and monitor fluid intake. Regular cardiac rehab and exercise under supervision can also be beneficial.
If symptoms persist despite optimal medical therapy, or if ejection fraction falls below 20‑25 % with refractory symptoms, referral for heart transplant evaluation or mechanical circulatory support (e.g., LVAD) is warranted. Early referral improves outcomes.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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