Hypertrophic Cardiomyopathy (HCM)
Hypertrophic cardiomyopathy is a genetic condition that causes the heart muscle to grow thicker than normal. It is not caused by stress, poor diet, or an inactive lifestyle. It is written into your DNA.
Most people who have it do not know. That is the problem. Without early diagnosis and treatment, the risk of heart failure, dangerous heart rhythms, and sudden cardiac death rises significantly, sometimes striking young, otherwise healthy people with no warning.
What is Hypertrophic Cardiomyopathy (HCM)
Hypertrophic cardiomyopathy, or HCM, is an inherited condition where the heart muscle grows abnormally thick. The thickening most often affects the septum, the wall dividing the two lower chambers of the heart. When the septum thickens, it narrows the path blood takes out of the heart.
This forces the heart to work harder with every beat. Over time, that extra strain can lead to heart failure, arrhythmias, and other serious complications.
HCM is not caused by lifestyle. People are born with the gene changes that cause it. This distinction matters because medication and monitoring, not diet and exercise alone, are what protect the heart long term.
At the BaleDoneen Method, identifying inherited heart conditions like HCM is central to preventing heart attacks and strokes before they happen.
Types of Hypertrophic Cardiomyopathy (HCM)
There are two main types of HCM. The difference comes down to whether the thickened muscle blocks blood flow.
Obstructive HCM is the more common type. About two thirds of people with HCM have it. The thickened septum blocks or reduces blood flow from the left ventricle to the aorta. This obstruction causes most of the symptoms people experience.
Non-obstructive HCM means the heart muscle is thickened but does not block blood flow. However, the left ventricle may become stiff and struggle to fill properly between beats. This still puts the heart under significant strain even without a physical blockage.
Both types increase the risk of serious complications. The severity depends on how thick the muscle has become and how early treatment begins.
Symptoms of Hypertrophic Cardiomyopathy
Many people with HCM have no symptoms at all. Others only notice problems during physical activity. Some develop symptoms gradually as the condition worsens over time.
Common symptoms include shortness of breath especially during exertion, chest pain, palpitations or a fluttering feeling in the chest, dizziness, fainting or near-fainting, fatigue, and swelling in the ankles or legs.
Symptoms often appear or worsen during exercise. This is one reason HCM is sometimes discovered after a sports physical or when someone collapses during athletic activity. In some cases, a heart attack or sudden cardiac arrest is the first sign that anything was wrong.
If you notice any of these symptoms, particularly chest pain or fainting during physical activity, report them to a doctor promptly. You can also review warning signs and symptoms and symptoms specific to women for more guidance.
Why Hypertrophic Cardiomyopathy Raises Heart Disease Risk
When the heart muscle thickens, the heart has less room to fill with blood and less ability to pump efficiently. This creates a chain of problems throughout the cardiovascular system.
The abnormal muscle structure also disrupts the heart’s electrical system. Heart muscle cells in people with HCM are arranged in a disorganized pattern. This is called myofiber disarray. It creates conditions where dangerous arrhythmias can develop without warning.
Atrial fibrillation is one of the most common complications of HCM. It raises the risk of blood clots forming inside the heart, which can travel to the brain and cause an ischemic stroke.
HCM is the most common cause of sudden cardiac death in athletes under age 35 in North America. Most of those individuals had no idea they had the condition. That is what makes early detection so critical.
Causes of Hypertrophic Cardiomyopathy
HCM is caused by changes in genes that control how heart muscle grows. The two most commonly affected genes are MYH7 and MYBPC3. Both are responsible for producing proteins that make up the structure of heart muscle cells. When these genes are altered, the cells grow abnormally and the muscle thickens over time.
Gene changes cause about 3 in 5 cases of HCM. In the remaining cases, no gene change has been identified, but the condition and its effects are still present.
HCM follows autosomal dominant inheritance. One changed gene from one parent is enough to cause the condition. Each child of a parent with HCM has a 50 percent chance of inheriting it. Because of this, a diagnosis in one family member should prompt screening in all first-degree relatives.
Treatment and Prevention
Treatment depends on how severe the condition is. Mild cases can often be managed with lifestyle changes alone.
Key lifestyle steps include regular walking and low-impact exercise, elevating the legs when resting, wearing compression stockings when recommended, stopping smoking, and maintaining a healthy weight.
When lifestyle changes are not enough, doctors may prescribe medications to reduce swelling or lower clot risk.
For more severe cases, minimally invasive procedures are available. Sclerotherapy injects medication into damaged veins to close them. Endovenous ablation uses heat energy through a catheter to close the vein. These treatments have short recovery times and good outcomes.
Surgery is reserved for the most severe cases where veins cannot be treated any other way.
According to UPMC, treatment for PVD is effective for managing varicose veins, chronic venous insufficiency, and deep vein thrombosis.
BaleDoneen takes a root-cause approach to vascular health. Addressing inflammation, blood pressure, and cholesterol all support better vein health long term.
Risk Factors
Key risk factors for complications from HCM include a family history of sudden cardiac death, severe thickening of the heart muscle wall, a history of unexplained fainting, abnormal heart rhythms detected on monitoring, and participation in high-intensity competitive sports.
People with the obstructive type of HCM face higher risk because the physical blockage of blood flow adds extra strain on an already compromised heart.
Having HCM alongside other cardiovascular risk factors compounds the danger. A person with HCM who also has high blood pressure, insulin resistance, or untreated endothelial dysfunction faces significantly greater risk than someone managing those factors well.
How Is Hypertrophic Cardiomyopathy Diagnosed?
Diagnosis begins with a medical history and physical exam. A doctor may hear a heart murmur through a stethoscope, which can signal obstructive HCM. Family history of heart disease or sudden death in a young relative also raises suspicion.
An echocardiogram is the primary diagnostic test. It uses sound waves to show the thickness of the heart walls and how blood flows through the heart. A wall thickness of 15 millimeters or more in an adult is typically considered diagnostic for HCM.
An electrocardiogram checks the heart’s electrical activity and usually shows abnormal results in people with HCM. Cardiac MRI provides detailed images of the heart muscle and can detect scarring or fibrosis. Holter monitors track heart rhythm over time to detect dangerous arrhythmias. Genetic testing identifies the specific gene change and allows family members to be screened through cascade testing.
For people with a family history of HCM, the American Heart Association recommends echocardiogram screening starting at age 12, continuing every one to three years through early adulthood, and then every five years after that.
Treatment and Prevention
Medications are the foundation of HCM treatment. Beta blockers are usually the first option. They slow the heart rate and reduce how hard the heart works. Calcium channel blockers are used when beta blockers are not effective or tolerated. Diuretics help manage fluid buildup and relieve swelling.
Mavacamten is a newer medication approved in 2022 specifically for obstructive HCM. Unlike other HCM medications, it targets the underlying cause of obstruction directly and improves both symptoms and heart function.
For people with severe obstructive HCM who do not respond to medication, procedures are available. Septal myectomy is open-heart surgery where a surgeon removes part of the thickened wall to restore blood flow. Alcohol septal ablation is a minimally invasive alternative where a small amount of alcohol is injected into the artery supplying the thickened tissue, causing it to shrink over time.
An implantable cardioverter defibrillator, or ICD, is recommended for people at high risk of sudden cardiac death. It monitors heart rhythm continuously and delivers a shock if a dangerous rhythm is detected.
Lifestyle choices support all treatments. A diet low in saturated fat, regular moderate physical activity, not smoking, and managing blood pressure, weight, and blood sugar all reduce overall cardiovascular risk. Anti-inflammatory nutrition plays a meaningful role in protecting heart health long term. High-intensity competitive sports should be discussed with a cardiologist before continuing, as exercise safety depends on individual risk.
Certain medications should be avoided in HCM. Nitrates lower blood pressure and can worsen obstruction. Digoxin increases the force of heart contractions and is generally harmful in HCM. Stimulants and high-dose diuretics without careful monitoring can also create serious problems. Always inform every healthcare provider about an HCM diagnosis before starting any new medication.