Quick answer. Heart failure means the heart has become too weak or too stiff to pump enough blood for the body’s needs. In Singapore it is most often caused by previous heart attacks, long-standing high blood pressure, heart valve disease or weakened heart muscle (cardiomyopathy). Common symptoms are breathlessness (on exertion, lying flat, or waking at night), swelling of the ankles and legs, fatigue and sudden weight gain from fluid retention. Doctors classify it as reduced ejection fraction (HFrEF, EF under 40%) or preserved ejection fraction (HFpEF, EF 50% or above). Treatment combines medications, salt and fluid moderation and managing the underlying cause. Sudden severe breathlessness is an emergency – call 995.
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In a medical emergency, or for severe or sudden symptoms such as breathing difficulty, chest pain, fainting or stroke signs, call 995 immediately.
Heart failure does not mean the heart has stopped – it means the heart muscle has become too weak or too stiff to pump enough blood to meet the body’s needs. As fluid backs up, people notice breathlessness, swelling and tiredness. It is a common and growing condition in Singapore, driven by an ageing population and high rates of heart attack, high blood pressure and diabetes.
The good news is that with the right combination of medications, lifestyle changes and treatment of the underlying cause, many people with heart failure live active lives for years. This guide explains the causes, the two main types (reduced vs preserved ejection fraction), what to watch for, and when breathlessness becomes an emergency.
At a glance
| Type | What happens | Typical features |
|---|---|---|
| HFrEF (reduced EF, under 40%) | Heart muscle contracts weakly, so less blood is pumped out with each beat | Often follows a heart attack, cardiomyopathy or coronary artery disease; responds well to the four foundational heart-failure medications |
| HFpEF (preserved EF, 50% or above) | Heart contracts normally but the stiff ventricle cannot relax and fill properly | More common with ageing, high blood pressure and diabetes; managed by controlling these conditions and fluid status |
| HFmrEF (mildly reduced, EF 41-49%) | An intermediate group between the two above | Managed with a combination of the approaches used for reduced and preserved EF |
What causes heart failure?
Heart failure is usually the end result of another heart problem that has damaged or overworked the muscle over time. Common causes in Singapore include:
- Coronary artery disease and previous heart attacks – the most frequent cause; scarred or starved muscle pumps poorly.
- Long-standing high blood pressure – forces the heart to work harder until it stiffens or weakens.
- Heart valve disease – leaking or narrowed valves strain the heart.
- Cardiomyopathy – disease of the heart muscle itself, which can be inherited, viral, related to alcohol, or have no clear cause.
- Abnormal heart rhythms, diabetes, thyroid disease and some chemotherapy drugs can also contribute.
Symptoms to watch for
Symptoms develop because blood and fluid back up and because organs do not get enough blood:
- Breathlessness – on exertion, when lying flat, or waking you at night gasping for air.
- Swelling (oedema) of the ankles, legs and sometimes the abdomen.
- Sudden weight gain over a few days from fluid retention.
- Fatigue and reduced exercise tolerance.
- Persistent cough (sometimes with frothy or pink-tinged phlegm) and palpitations.
Weighing yourself daily and reporting a gain of more than about 2 kg in a few days helps catch worsening fluid early.
How heart failure is diagnosed
A doctor will take a history, examine you for fluid signs, and arrange tests such as:
- Blood tests including BNP or NT-proBNP, which rise in heart failure.
- Echocardiogram (heart ultrasound) – the key test that measures the ejection fraction and shows valve or muscle problems.
- ECG and chest X-ray.
- Further tests such as coronary angiogram or cardiac MRI when the cause needs clarifying.
The ejection fraction result is what separates reduced-EF from preserved-EF heart failure and guides treatment.
Treatment and medications
For reduced ejection fraction (HFrEF), four foundational medication groups are now standard care in Singapore and have been shown to improve symptoms, reduce hospitalisations and prolong life:
- ARNI (angiotensin receptor-neprilysin inhibitor) or an ACE inhibitor/ARB
- Beta-blockers
- Mineralocorticoid receptor antagonists (MRAs)
- SGLT2 inhibitors
Diuretics (water pills) relieve fluid overload and swelling. For preserved ejection fraction (HFpEF), treatment focuses on controlling blood pressure, diabetes and fluid, with SGLT2 inhibitors increasingly used. Some patients benefit from devices such as a pacemaker, cardiac resynchronisation therapy (CRT) or an implantable defibrillator (ICD), and a minority may need valve treatment or a transplant assessment.
Lifestyle, fluid and salt
Day-to-day self-care is central to staying out of hospital:
- Limit salt – excess sodium causes fluid retention; choose fresh foods and go easy on sauces, processed and hawker dishes high in salt.
- Watch fluid intake if your doctor advises a daily limit, and weigh yourself at the same time each day.
- Take medications exactly as prescribed and do not stop them on your own.
- Stay active – aim for regular, paced exercise as guided by your care team; cardiac rehabilitation programmes (such as the one at NHCS) can help.
- Stop smoking, limit alcohol, and keep up vaccinations against flu and pneumonia.
When heart failure is an emergency
Call 995 immediately if there is sudden severe breathlessness, breathlessness so bad you cannot lie flat or speak, chest pain, blue-tinged lips, fainting, or coughing up frothy pink phlegm – these can signal acute pulmonary oedema or a heart attack. See a doctor promptly (not necessarily an emergency) if you notice gradual worsening of breathlessness, increasing leg swelling, or rapid weight gain, as your treatment may need adjusting. Subsidies and chronic disease support (including MediSave use under the Chronic Disease Management Programme, which covers heart failure) may help with ongoing costs – check eligibility with your provider.
Related guides
- Best Cardiology Clinics in Singapore — our editorial shortlist
- cardiology clinics directory
- Coronary artery disease & angina
- Heart valve disease
- Heart rhythm disorders
Sources
- SingHealth – Heart Failure: Symptoms & Treatments
- NHCS – Heart Failure Programme
- NHCS Murmurs – Management of Heart Failure
- NUHCS – Heart Failure with Reduced EF (HFrEF)
- HealthHub – Heart Failure
Related conditions & guides
Related conditions and guides you may find useful:
- Diabetes Complications in Singapore
- Heart Attack Warning Signs in Singapore
- Heart Screening in Singapore
- High Blood Pressure (Hypertension) in Singapore
- High Cholesterol in Singapore
- Heart Palpitations & Atrial Fibrillation (AFib) in Singapore
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