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Overview
What Is Arrhythmogenic Right Ventricular Cardiomyopathy?
Arrhythmogenic right ventricular cardiomyopathy is a heart muscle disease in which abnormal scar and fatty tissue can replace healthy heart muscle, especially in the right ventricle. These changes can create abnormal heart rhythms and reduce the heart’s ability to pump blood. This form of arrhythmogenic cardiomyopathy often has a genetic basis and may affect adolescents or adults. It can also be present before symptoms or rhythm changes develop.
Symptoms
Symptoms
Symptoms vary from person to person and may become noticeable during exercise. Some people have no symptoms until an abnormal rhythm is found during testing or after an event.
- Fast or irregular heartbeat (palpitations) may feel like fluttering, pounding, or skipped beats.
- Fainting (syncope) can occur when an abnormal rhythm briefly reduces blood flow to the brain.
- Dizziness may occur during an arrhythmogenic right ventricular arrhythmia or with reduced blood flow.
- Shortness of breath may develop during activity or as heart function worsens.
- Chest discomfort can occur with an abnormal rhythm or strain on the heart.
- Reduced ability to exercise may appear as unusual fatigue or breathlessness with activity.
Causes
Causes
Changes in genes involved in the connections between heart muscle cells, especially desmosomal genes, can make the heart more vulnerable to cell injury. Over time, injured cells may be replaced by scar or fatty tissue, causing the changes seen in arrhythmogenic right ventricular dysplasia and related conditions.
Inherited gene changes and family transmission
Arrhythmogenic cardiomyopathy is often inherited in an autosomal dominant pattern. In simple terms, a person with a disease-associated gene change may have a 1-in-2 chance of passing it to each child, although not everyone with the change develops disease or develops it to the same degree. Some people with typical features have no gene change identified by current testing.
Intense or prolonged endurance exercise can place extra stress on vulnerable heart muscle and may accelerate disease expression or increase arrhythmias in susceptible people. Exercise is not the sole cause, and activity recommendations should be individualized by a cardiologist.
Risk Factors
Risk Factors
- A first-degree relative with arrhythmogenic cardiomyopathy or unexplained sudden cardiac death increases inherited risk.
- A known disease-associated gene variant raises the likelihood of developing arrhythmogenic right ventricular disease.
- Male sex is associated with a greater observed burden of disease in some studies, although anyone can be affected.
- Younger age may be important because disease expression can emerge during adolescence or early adulthood.
- Frequent high-intensity endurance exercise may increase stress on susceptible heart muscle.
Family history and genetics are nonmodifiable risk factors. Exposure to strenuous endurance exercise may be modifiable, but activity changes should be discussed with a cardiologist rather than self-prescribed.
Complications
Complications
- Ventricular tachycardia is a rapid rhythm that begins in the lower chambers of the heart.
- Ventricular fibrillation is a chaotic rhythm that prevents effective pumping.
- Sudden cardiac arrest can occur when the heart abruptly stops pumping effectively.
- Right-sided or biventricular heart failure can develop as heart muscle function declines.
- Blood clots may form because of poor pumping or atrial rhythm problems and can travel to other parts of the body.
- Rarely, advanced heart-failure therapies may be needed when disease becomes severe.
The risk of complications differs widely. It is influenced by symptoms, heart function, previous ventricular arrhythmias, imaging findings, family history, and genetic factors.
Diagnosis
Diagnosis
No single test confirms every case of arrhythmogenic right ventricular cardiomyopathy. Clinicians use established clinical criteria that combine electrical, structural, rhythm, tissue, and family-history findings to reach a diagnosis.
| Test or evaluation | What it assesses | Why it may be used |
|---|---|---|
| 12-lead ECG | Electrical patterns and conduction | Looks for rhythm or repolarization changes |
| Echocardiogram | Heart size, motion, and pumping | Checks right- and left-ventricular structure and function |
| Cardiac MRI | Heart anatomy, tissue, and scar | Provides detailed assessment of ventricular changes |
| Rhythm monitoring | Intermittent or sustained arrhythmias | Detects abnormal rhythms that a brief ECG may miss |
| Genetic testing | Disease-associated gene variants | May support diagnosis and guide family evaluation |
| Family evaluation | Inherited disease risk | Helps identify relatives who need screening |
Treatment & Management
Treatment and Management
Treatment is individualized according to symptoms, arrhythmia history, ventricular function, imaging results, family history, and overall risk. The goals are to reduce dangerous rhythms, protect heart function, and manage symptoms over time.
| Management approach | Main purpose | When it may be considered |
|---|---|---|
| Exercise modification | Reduce stress on vulnerable heart muscle | For people with confirmed disease or significant inherited risk, based on specialist advice |
| Medications | Control arrhythmias or support heart function | When rhythm symptoms or ventricular dysfunction are present |
| Catheter ablation | Reduce recurrent ventricular arrhythmias | For selected patients with repeated or difficult-to-control rhythms |
| Implantable cardioverter-defibrillator | Detect and treat life-threatening ventricular rhythms | For people whose sudden-death risk meets guideline-based criteria |
| Heart-failure therapy | Improve symptoms and reduce strain on the heart | When pumping function or congestion is reduced |
| Advanced heart-failure care | Support severe or progressive disease | When symptoms remain severe despite standard treatment |
Regular cardiology follow-up helps monitor rhythm and heart function, review medications, and update individualized activity guidance. When inherited disease is suspected, close relatives may also need evaluation and periodic screening.
Outlook and Prognosis
Outlook and Prognosis
The course of arrhythmogenic right ventricular cardiomyopathy ranges from disease found through family screening in someone without symptoms to recurrent arrhythmias, progressive ventricular dysfunction, or advanced heart failure. The diagnosis is chronic and is usually managed rather than cured, with treatment tailored to changing risks.
Factors that influence the outlook
Outlook is influenced by a prior cardiac arrest or sustained ventricular arrhythmia, ventricular function, the extent of structural disease, symptoms, response to treatment, genetic and family factors, and adherence to specialist activity guidance.
When Should You See a Doctor
When Should You See a Doctor?
Get urgent help
Emergency symptoms need immediate attention
Seek emergency medical care for collapse, suspected cardiac arrest, fainting during exercise, or a fast or irregular heartbeat with chest pain, severe shortness of breath, or severe dizziness. Call local emergency services for collapse, unresponsiveness, or absent normal breathing.
People with exertional palpitations, unexplained fainting, repeated dizziness, reduced exercise tolerance, or a close relative with arrhythmogenic cardiomyopathy or unexplained sudden cardiac death should arrange prompt evaluation with a clinician or cardiologist.
Branches
1 topic
Arrhythmogenic Right Ventricular Cardiomyopathy
Cardiology
Tests & Procedure
1 topic
Arrhythmogenic Right Ventricular Cardiomyopathy
Ablation Therapy
Symptoms
1 topic
Arrhythmogenic Right Ventricular Cardiomyopathy
Palpitations
