Heart
Cardiomyopathy
A disease of the heart muscle that makes it harder for your heart to pump blood to the rest of your body.
Cardiomyopathy is a group of heart muscle diseases that impair the heart's ability to pump effectively. Early assessment prevents heart failure and sudden cardiac death.
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Cardiomyopathy involves the abnormal thickening or weakening of the heart muscle, progressively reducing its ability to pump effectively.
Cardiomyopathy: A Disease of the Heart Muscle Itself
Most heart problems are really problems of the plumbing (the coronary arteries) or the valves. Cardiomyopathy is different: it is a disease of the heart muscle itself, which becomes too stretched and weak, too thick, or too stiff to pump normally.
It is an umbrella term covering several distinct conditions, some inherited and some acquired through infection, pregnancy, chemotherapy, alcohol or severe stress. The spectrum is wide — many people are picked up incidentally and stay well for decades, while others develop heart failure or dangerous rhythms. What ties them together is that catching the disease early, before the muscle is badly damaged, changes the outlook substantially.
It is an umbrella term covering several distinct conditions, some inherited and some acquired through infection, pregnancy, chemotherapy, alcohol or severe stress. The spectrum is wide — many people are picked up incidentally and stay well for decades, while others develop heart failure or dangerous rhythms. What ties them together is that catching the disease early, before the muscle is badly damaged, changes the outlook substantially.
The Main Types, and What Sets Them Apart
The type matters because it drives the treatment, the risk of sudden rhythm problems, and whether relatives should be screened.
- Dilated (DCM) — the main pumping chamber stretches and weakens. The commonest form, often genetic, sometimes triggered by a virus, alcohol or chemotherapy
- Hypertrophic (HCM) — the muscle thickens abnormally. The commonest inherited heart condition and a leading cause of sudden death in young athletes, though most people with it live normally
- Restrictive — the walls become stiff and cannot fill properly, often due to an infiltrating substance such as amyloid
- Arrhythmogenic (ARVC) — a genetic condition where muscle is replaced by fat and scar, producing dangerous rhythms
- Takotsubo (stress cardiomyopathy) — a sudden, usually reversible weakening triggered by intense emotional or physical stress
Symptoms: From Nothing to a Collapse
Cardiomyopathy can be completely silent, found only when an echocardiogram is done for another reason or during family screening. When symptoms appear they usually reflect a struggling pump or an unstable rhythm.
Two things always warrant urgent assessment: fainting or near-fainting during exertion, and a family history of sudden unexplained death before the age of 50. Neither should be brushed off.
Two things always warrant urgent assessment: fainting or near-fainting during exertion, and a family history of sudden unexplained death before the age of 50. Neither should be brushed off.
- Breathlessness on exertion or lying flat, and unusual fatigue
- Swelling of the ankles, legs or abdomen
- Palpitations, or a fast forceful heartbeat
- Fainting on exertion — a red flag that needs prompt cardiology review
- Chest tightness, particularly in hypertrophic cardiomyopathy
How We Diagnose It in Singapore
An echocardiogram — an ultrasound of the heart — is the first test and often makes the diagnosis. From there we usually add a cardiac MRI, which shows scarring and can identify the specific type, an ECG and a Holter monitor to look for rhythm disturbances, and an exercise test.
Where the cause looks inherited, genetic testing and screening of first-degree relatives (an ECG and echo, sometimes a gene test) are important. Blood tests help exclude treatable causes such as thyroid disease, iron overload and cardiac amyloid. This work-up is available at Paragon Medical Centre on Orchard Road and the restructured heart centres.
Where the cause looks inherited, genetic testing and screening of first-degree relatives (an ECG and echo, sometimes a gene test) are important. Blood tests help exclude treatable causes such as thyroid disease, iron overload and cardiac amyloid. This work-up is available at Paragon Medical Centre on Orchard Road and the restructured heart centres.
Treatment: Protecting the Pump, Preventing Arrhythmia
Treatment is tailored to the type, but the aims are shared: support the pump, control symptoms, and prevent dangerous rhythms.
- Medications — for dilated cardiomyopathy, the four heart-failure drug classes that improve survival; for hypertrophic cardiomyopathy, beta-blockers and, increasingly, a cardiac myosin inhibitor
- Implantable defibrillator (ICD) — for those at high risk of a life-threatening rhythm, it can stop one within seconds
- Cardiac resynchronisation (CRT) — a pacemaker that re-coordinates a weak, poorly synchronised heart
- Septal myectomy or alcohol septal ablation — to relieve obstruction in hypertrophic cardiomyopathy when medication is not enough
- Heart transplant or a mechanical pump (LVAD) — for end-stage disease
Family Screening and Living Well
If your cardiomyopathy is inherited, first-degree relatives — parents, siblings, children — should be offered screening, because early disease is treatable and knowing changes decisions about sport and pregnancy.
Most people with well-controlled cardiomyopathy work, travel and exercise. The advice on activity depends on the type: in hypertrophic cardiomyopathy we steer away from competitive, explosive or heavy static sports while encouraging regular moderate exercise; in dilated cardiomyopathy it depends on how well the pump is working. Pregnancy needs planning and specialist input. We review patients regularly from Paragon Medical Centre, adjusting treatment as the picture evolves.
Most people with well-controlled cardiomyopathy work, travel and exercise. The advice on activity depends on the type: in hypertrophic cardiomyopathy we steer away from competitive, explosive or heavy static sports while encouraging regular moderate exercise; in dilated cardiomyopathy it depends on how well the pump is working. Pregnancy needs planning and specialist input. We review patients regularly from Paragon Medical Centre, adjusting treatment as the picture evolves.
Cardiomyopathy: Common Questions
Concerned About Cardiomyopathy?
Dr. Peter Chang offers specialist assessment and personalised management at Paragon Medical Centre, Singapore.