Hypertrophic Cardiomyopathy

Hypertrophic cardiomyopathy is a common heart condition that often remains undiagnosed. Young athletes face a significant risk as it ranks as the primary cause of sudden cardiac death in sports across the world. Most people don't know about its existence or recognise its symptoms.

The condition causes heart muscle tissue to thicken abnormally, especially in the heart's left ventricle. Patients typically develop one of two types. The obstructive type affects about two-thirds of patients and blocks blood flow from the heart. The non-obstructive type affects the remaining third and makes the heart work harder than normal, though it doesn't block blood flow.

A parent's genetic makeup plays a crucial role. Children who have a parent with this condition face a higher chance of inheriting the responsible gene mutation. The outlook isn't as dire as it might seem. Proper treatment reduces the risk of complications and you can have a fulfilling life with proper management of symptoms.

This article provides essential information about hypertrophic cardiomyopathy. Patients and families will learn to identify warning signs, understand treatment options, and determine the right time to seek medical attention.

What is Hypertrophic Cardiomyopathy?

The muscular wall of the heart becomes thick in HCM. It usually affects the left ventricle and the septum (the wall between heart chambers). As the muscle enlarges, the normal structure of the heart changes. The space inside the heart gets smaller and thicker. The thick heart becomes stiff and can't relax or fill with blood properly. Insufficient blood flow within the heart affects normal cardiac function resulting in arrhythmias and heart failure.

Hypertrophic Cardiomyopathy Symptoms 

Most people with HCM don't show symptoms at first. Common symptoms include:

• Chest pain, especially during exercise
• Shortness of breath with activity
• Fatigue or lack of energy
• Fainting or feeling lightheaded
• Heart palpitations (feeling fast or irregular heartbeats)
• Swelling in the legs, ankles, or abdomen

Causes of Hypertrophic Cardiomyopathy

Gene mutations affecting the heart's sarcomeres (structures that help the heart muscle contract) cause HCM. MYH7 and MYBPC3 genes account for the majority of known variant-positive cases. HCM runs in families as an autosomal dominant condition.

Risk of Hypertrophic Cardiomyopathy

People can develop HCM at any age, but it usually shows up during adolescence or young adulthood. Doctors diagnose men more often than women. Research shows women might get diagnosed later and face worse outcomes. People with a first-degree relative (parent, sibling, or child) who has HCM face a higher risk and should get screened.

Complications of Hypertrophic Cardiomyopathy

Atrial fibrillation affects many patients over time. Other complications include heart failure, stroke, and infective endocarditis. HCM is the most common identifiable cause of sudden cardiac death in people under 35 years. This includes well-trained athletes, though sudden cardiac death remains rare.

Diagnosis of Hypertrophic Cardiomyopathy

Your doctor starts with a full physical exam and listens for heart murmurs or unusual heart sounds. The diagnostic process includes multiple tests:

• Echocardiogram: This ultrasound test shows your heart's structure and thickened walls. It serves as the main diagnostic tool.
• Electrocardiogram (ECG): This test records your heart's electrical activity and often reveals abnormal patterns with HCM.
• Cardiac MRI: These detailed heart images can spot scarring or fibrosis.
• 24-Hour Holter Monitor: Your heart rhythm gets recorded throughout an entire day or longer.
• Genetic Testing: Family members of patients with HCM should consider this test.

Treatment for Hypertrophic Cardiomyopathy

Doctors manage your symptoms and prevent complications through various approaches. They are:

• Medications:
  • Beta blockers and calcium channel blockers help slow your heart rate
  • Disopyramide reduces obstruction and regulates the heartbeat
  • Cardiac myosin inhibitors like mavacamten work for obstructive HCM
• Procedures:
  • Septal myectomy removes thickened heart muscle through surgery
  • Alcohol septal ablation offers a minimally invasive option if surgery isn't possible
  • Implantable defibrillator protects patients with a high risk of dangerous heart rhythms

When to See a Doctor

Get medical help right away if you experience:

• Chest pain or pressure that lasts more than a few minutes
• Episodes where you faint or almost faint
• Sudden breathing difficulty, especially while resting
• Your heart beats rapidly or irregularly
• HCM can worsen over time, so regular check-ups matter even if you feel fine.

Conclusion

Knowing more about this heart condition can equip you better to manage it. The thickened heart muscle affects many people (maybe even someone you know). Hypertrophic cardiomyopathy often stays hidden until symptoms show up or screening detects it. The good news is that most patients lead normal lives by paying attention to warning signs like breathlessness or chest pain. Treatment options keep growing, and they give hope through medications, surgical procedures and implantable devices that match each patient's needs.

Living with hypertrophic cardiomyopathy means making some changes but you rarely just need to completely change your lifestyle. Regular checkups, taking medications, and knowing your body's signals become routine. Patients and their families should stay informed and work closely with doctors. Many people live well despite this heart condition.

FAQs

1. What is the difference between obstructive and non-obstructive HCM?

The thickened wall between heart chambers blocks blood flow from the left ventricle to the aorta in obstructive HCM. This type affects about two-thirds of HCM patients. The blockage makes the heart work harder and often creates a heart murmur.

Non obstructive HCM shows heart muscle thickening without direct blood flow blockage. The heart muscle becomes stiff and the ventricle struggles to relax and fill between beats. Patients with this type usually show milder symptoms.

2. What makes surgery or other procedures necessary for HCM?

Doctors recommend surgical options for patients who:

• Show severe symptoms even after taking medications
• Cannot tolerate the side effects of medicines

Treatment procedures include:

• Septal myectomy - surgeons remove part of the thickened muscle through open-heart surgery
• Alcohol septal ablation - doctors inject alcohol through a small artery to reduce thickened tissue (a better option for older patients)
• Implantable devices - including defibrillators that protect patients from dangerous heart rhythms

3. Can hypertrophic cardiomyopathy be prevented?

No one can prevent HCM because genetic mutations cause this condition. The condition runs in families as an autosomal dominant trait. Children of affected parents have a 50% chance to inherit it.

Family screening helps detect HCM early. First-degree relatives need genetic testing or regular echocardiograms. Adults should get checked every five years while adolescents need screening every 12-18 months.

CARE Medical Team