Cardiomyopathy
Cardiomyopathy is a disease of the heart muscle itself. It can cause heart failure, arrhythmias, and sudden cardiac risk when it is not recognised early.
What Is Cardiomyopathy?
A disease of the heart muscle that weakens pumping, alters rhythm, or makes the heart stiff and less compliant.
Cardiomyopathy is a structural and functional disorder of the myocardium. It can be dilated, hypertrophic, restrictive, or arrhythmogenic. It often causes breathlessness, exercise intolerance, palpitations, and when untreated can progress to heart failure or sudden cardiac arrest.
Why Cardiomyopathy Happens
The major causes include genetics, prior heart attack, viral illness, alcohol, and hypertension.
Dilated Cardiomyopathy
The chambers enlarge and the heart muscle weakens, often after prior myocardial infarction, viral myocarditis, alcohol, or untreated hypertension.
Hypertrophic Cardiomyopathy
Excess thickening of the heart wall, commonly genetic, can obstruct blood flow and trigger arrhythmias even in young adults.
Restrictive Cardiomyopathy
The heart becomes stiff and cannot fill properly, often because of infiltrative disease or inflammation.
Arrhythmogenic Cardiomyopathy
Fatty or fibrofatty replacement of the ventricle creates an electrical substrate for VT and sudden cardiac death.
How Cardiomyopathy Presents
Symptoms vary depending on whether the heart is weak, stiff, or electrically unstable.
Breathlessness
Reduced pumping or filling may cause exertional dyspnoea or fluid retention.
Palpitations
AF, VT, or ectopy can cause fluttering, light-headedness, or a sensation of skipped beats.
Fatigue & Reduced Exercise Capacity
The heart cannot sustain normal output during exercise, especially as the disease is more advanced.
Blackouts or Near-Syncope
More common when there is dangerous arrhythmia or severe outflow obstruction.
How Cardiomyopathy Is Diagnosed
The diagnosis is built from echo, ECG, symptoms, and sometimes MRI or genetic testing.
2D Echocardiography
Defines chamber size, wall thickness, ventricular function, and outflow obstruction or diastolic dysfunction.
12-Lead ECG
Shows rhythm abnormalities, conduction disease, and patterns suggestive of hypertrophic or arrhythmogenic disease.
Cardiac MRI
Clarifies scar tissue, fibrosis, wall thickness, and chamber architecture when echo is inconclusive.
Holter / Rhythm Monitoring
Captures silent arrhythmias when symptoms are intermittent or the risk is not obvious on a resting ECG.
What Happens If It Is Left Untreated?
Progression may lead to heart failure, abrupt rhythm disturbances, or sudden cardiac death.
Heart Failure
Dilated or restrictive cardiomyopathy can progress to reduced ejection fraction and fluid retention.
Arrhythmias
VT, AF, and ventricular ectopy can cause palpitations, syncope, or sudden death.
Stroke Risk
AF linked with cardiomyopathy increases the risk of cardioembolic stroke.
Treatment Options
Care is tailored to the type and severity of cardiomyopathy and the rhythm risk.
Guideline-Based Medical Therapy
ACE inhibitors, beta-blockers, mineralocorticoid receptor antagonists, SGLT2 inhibitors, and diuretics are used in selected types of HFrEF or volume overload.
Rhythm Management
AF, ventricular ectopy, or VT may be treated with ablation, anti-arrhythmic medications, or defibrillator therapy.
Structural Interventions
Some patients require valve treatment, septal reduction, or repair of a reversible cause such as a mechanical defect or major valve lesion.
Frequently Asked Questions
Common questions about diagnosis, risk, and treatment.
01Can cardiomyopathy be reversed?
Some forms improve when the underlying cause is corrected — for example, alcohol-related cardiomyopathy, reversible inflammation, or tachycardia-mediated cardiomyopathy. Others require long-term medical management and rhythm surveillance.
02Does cardiomyopathy cause a stroke?
It can, especially when it is associated with atrial fibrillation or atrial enlargement. The risk of cardioembolic stroke rises when the rhythm is irregular and blood is allowed to stagnate in the atria.
“Advanced cardiovascular care. Restoring life, rhythm, and vitality.”
Dr. Amit Singh, FACC
Consultant Interventional Cardiologist
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Medical Disclaimer: This article has been written and reviewed by Dr. Amit Singh, FACC, for educational purposes only. It does not constitute personalised medical advice and should not be used as a substitute for a consultation with a qualified cardiologist. Individual clinical decisions must be made by a treating physician based on complete medical history and examination. If you are experiencing chest pain, breathlessness, or other cardiac symptoms, seek emergency medical care immediately.