Is your heart working overtime? Cardiologist warns against hidden dangers of obstructive hypertrophic cardiomyopathy

Experiencing breathlessness, fatigue, chest discomfort, or unexplained dizziness can often feel alarming. These symptoms are commonly associated with conditions such as coronary artery disease or age-related cardiac problems. However, in some individuals, they may indicate a lesser-known but serious inherited heart condition called Hypertrophic Cardiomyopathy (HCM). When this condition obstructs the normal flow of blood out of the heart, it is referred to as obstructive Hypertrophic Cardiomyopathy (oHCM).

HCM affects nearly 1 in 500 individuals worldwide, making it one of the most common inherited cardiac disorders. Despite this, many individuals continue to remain undiagnosed for years because symptoms may be mild, intermittent, or mistaken for other cardiac or lifestyle-related concerns.

What is oHCM?

At its core, Hypertrophic Cardiomyopathy (HCM) causes abnormal thickening of the heart muscle, particularly the interventricular septum. There are two forms of the condition; non-obstructive HCM, where blood flow is not significantly blocked, and obstructive HCM (oHCM), where the thickened muscle partially blocks blood flow from the left ventricle to the aorta, forcing the heart to work harder.

What are the symptoms of oHCM?

Symptoms often resemble those of other heart conditions and may include breathlessness, chest pain, palpitations, fatigue, dizziness, or fainting, particularly during physical activity. While some patients experience difficulty with routine activities, others may remain symptom-free despite significant changes in the heart.

The condition can sometimes progress silently. HCM is also recognized as one of the important causes of sudden cardiac death in young individuals and athletes, often due to heart disorders. This is why awareness and timely evaluation are extremely important.

Genetics of oHCM

An important aspect of HCM is its strong genetic basis. In the majority of cases, the condition is inherited in an autosomal dominant pattern, meaning a child of an affected parent has nearly a 50% chance of inheriting the altered gene. Mutations affecting proteins involved in heart muscle contraction, particularly MYH7 and MYBPC3 genes, are among the most commonly identified causes. However, inheriting a mutation does not always mean that severe disease will develop. Some individuals may carry the mutation for years before structural changes become visible.

Due to its inherited nature, Hypertrophic Cardiomyopathy (HCM) often requires screening of first-degree relatives through ECG, echocardiography, and in some cases genetic testing, even if they are asymptomatic. In some cases, however, the condition may result from spontaneous genetic mutations without a known family history.

Importance of early diagnosis

Early diagnosis is essential because timely monitoring and intervention can significantly improve quality of life and reduce the risk of complications.

Electrocardiography (ECG) helps detect rhythm abnormalities linked to Hypertrophic Cardiomyopathy (HCM), while echocardiography remains the primary diagnostic tool for assessing heart muscle thickening, obstruction, and valve involvement.

How to manage obstructive Hypertrophic Cardiomyopathy?

Management of obstructive Hypertrophic Cardiomyopathy (oHCM) focuses on relieving symptoms, reducing obstruction, lowering heart diseases, and improving long-term outcomes. Treatment is aimed at reducing obstruction, controlling symptoms, preventing heart rhythm disorders, and improving overall cardiac function through a combination of pharmaceutical therapy, surgical interventions, and device implantation where clinically required. Genetic counselling and family screening remain important parts of long-term disease management.

Affect on emotional health

Beyond its physical symptoms, obstructive Hypertrophic Cardiomyopathy (oHCM) can also affect emotional well-being, with uncertainty around symptoms and long-term heart health often causing anxiety and stress. However, advances in imaging, genetics, and treatment have significantly improved outcomes, enabling most individuals with early diagnosis and regular monitoring to lead active, near-normal lives.

Symptoms such as unexplained breathlessness, chest discomfort, palpitations, fainting, or a family history of sudden cardiac death should never be ignored, as timely evaluation and proactive screening can help detect the condition earlier and prevent serious complications. Ultimately, awareness, early diagnosis, family screening, and timely intervention remain key to reducing complications like heart disorders and protecting long-term heart health.