Overview
Left ventricular noncompaction (LVNC), also called noncompaction cardiomyopathy or spongy myocardium, is a rare heart condition where the left ventricle — the main pumping chamber of the heart — does not develop properly. Normally, the heart muscle becomes smooth and compact before birth. In LVNC, part of the muscle stays spongy and trabeculated, meaning it has deep ridges and pockets instead of a firm, solid wall. This makes it harder for the heart to pump blood efficiently. The condition can cause a wide range of problems. Some people have few or no symptoms for years, while others develop serious heart failure, dangerous heart rhythm problems (arrhythmias), or blood clots that can travel to the brain and cause a stroke. Symptoms often include shortness of breath, extreme tiredness, swelling in the legs, and palpitations. In children, LVNC can cause poor growth and feeding difficulties. Treatment focuses on managing symptoms and preventing complications. Medications such as beta-blockers, ACE inhibitors, and blood thinners are commonly used. Some patients may need a pacemaker or implantable defibrillator. In severe cases, a heart transplant may be considered. There is currently no cure, but early diagnosis and careful management can significantly improve quality of life and outcomes.
Also known as:
Key symptoms:
Shortness of breath, especially during activity or when lying flatExtreme tiredness or fatigue even with mild exertionSwelling in the legs, ankles, or feetHeart palpitations or a racing, fluttering heartbeatDizziness or lightheadednessFainting or near-fainting episodesChest pain or tightnessStroke or mini-stroke symptoms such as sudden weakness or speech problemsPoor feeding and slow weight gain in infantsBluish skin color (cyanosis) in newborns or infantsReduced ability to exercise or keep up with peersIrregular heartbeat detected on an ECG
Variable
Can be inherited in different ways depending on the underlying gene
Variable
Can begin at different ages, from infancy through adulthood
FDA & Trial Timeline
1 eventLondon Health Sciences Centre Research Institute OR Lawson Research Institute of St. Joseph's
Data sourced from FDA regulatory filings and ClinicalTrials.gov. Updated periodically.
Treatments
No FDA-approved treatments are currently listed for Left ventricular noncompaction.
1 clinical trialare actively recruiting — trials can provide access to cutting-edge therapies.
View clinical trials →Treatment Centers
8 centersBaylor College of Medicine Rare Disease Center ↗
Baylor College of Medicine
📍 Houston, TX
🏥 NORDStanford Medicine Rare Disease Center ↗
Stanford Medicine
📍 Stanford, CA
🔬 UDNNIH Clinical Center Undiagnosed Diseases Program ↗
National Institutes of Health
📍 Bethesda, MD
🔬 UDNUCLA UDN Clinical Site ↗
UCLA Health
📍 Los Angeles, CA
🔬 UDNBaylor College of Medicine UDN Clinical Site ↗
Baylor College of Medicine
📍 Houston, TX
🔬 UDNHarvard/MGH UDN Clinical Site ↗
Massachusetts General Hospital
📍 Boston, MA
🏥 NORDMayo Clinic Center for Individualized Medicine ↗
Mayo Clinic
📍 Rochester, MN
👤 Mayo Clinic Center for Individualized Medicine
🏥 NORDUCLA Rare Disease Day Program ↗
UCLA Health
📍 Los Angeles, CA
Travel Grants
No travel grants are currently matched to Left ventricular noncompaction.
Community
No community posts yet. Be the first to share your experience with Left ventricular noncompaction.
Start the conversation →Latest news about Left ventricular noncompaction
Disease timeline:
New recruiting trial: Predictors of Risk in Left Ventricular Non-Compaction
A new clinical trial is recruiting patients for Left ventricular noncompaction
Caregiver Resources
NORD Caregiver Resources
Support, advocacy, and financial assistance for caregivers of rare disease patients.
Mental Health Support
Rare disease caregiving can be isolating. Connect with counseling and peer support.
Family & Caregiver Grants
Financial assistance programs specifically for caregivers of rare disease patients.
Social Security Disability
Learn how rare disease patients may qualify for SSDI/SSI benefits.
Questions for your doctor
Bring these to your next appointment
- Q1.How severe is my LVNC, and what does that mean for my daily life and long-term outlook?,Should I have genetic testing, and should my family members be screened even if they feel fine?,Do I need blood thinners to prevent a stroke, and what are the risks and benefits for me specifically?,Should I avoid certain types of exercise or physical activity, and are there activities that are safe?,Do I need an implantable defibrillator or pacemaker, and how will I know if that changes in the future?,How often should I have echocardiograms or cardiac MRIs to monitor my heart?,What symptoms should prompt me to go to the emergency room immediately?
Common questions about Left ventricular noncompaction
What is Left ventricular noncompaction?
Left ventricular noncompaction (LVNC), also called noncompaction cardiomyopathy or spongy myocardium, is a rare heart condition where the left ventricle — the main pumping chamber of the heart — does not develop properly. Normally, the heart muscle becomes smooth and compact before birth. In LVNC, part of the muscle stays spongy and trabeculated, meaning it has deep ridges and pockets instead of a firm, solid wall. This makes it harder for the heart to pump blood efficiently. The condition can cause a wide range of problems. Some people have few or no symptoms for years, while others develop
Are there clinical trials for Left ventricular noncompaction?
Yes — 1 recruiting clinical trial is currently listed for Left ventricular noncompaction on UniteRare. See the clinical trials section on this page for phase, sponsor, and site details sourced from ClinicalTrials.gov.
Which specialists treat Left ventricular noncompaction?
17 specialists and care centers treating Left ventricular noncompaction are listed on UniteRare, sourced from ClinicalTrials.gov principal investigators, published research, and the NPPES NPI registry.