What Is Heart Failure?

Heart failure occurs when your heart muscle becomes weak, stiff or structurally damaged (to the point that it cannot pump blood as effectively as the body requires). This leads to a build up of fluid (congestion) in the lungs, legs and other tissues (all reducing the amount of oxygenated blood delivered to the organs).

Heart failure can affect the left side, right side, or both sides of the heart. Left heart failure causes fluid to back up into the lungs, producing breathlessness and fatigue. Right heart failure causes fluid to build up in the legs and abdomen.

The 7 Early Signs of Heart Failure

• Breathlessness (Dyspnoea): Breathlessness that occurs with activities that previously caused no difficulty like climbing stairs or carrying light groceries, is one of the earliest signs of heart failure. As the heart fails to pump efficiently fluid backs up into the lungs. A particularly telling sign is orthopnoea: breathlessness when lying flat which is relieved by sitting up.

• Persistent fatigue and weakness: The failing heart cannot deliver sufficient oxygenated blood to the muscles and organs, leading to fatigue that is disproportionate to activity level and does not improve with rest. 

• Ankle and leg swelling (peripheral oedema): When the right side of the heart weakens, fluid leaks into surrounding tissues (mostly you can see it in the ankles, feet and lower legs). Pressing a finger into the swollen area leaves an indentation that persists for several seconds (pitting oedema), a clinically significant finding.

• Rapid or irregular heartbeat: The heart attempts to compensate for reduced pumping efficiency by beating faster. Many patients experience palpitations (a sensation of the heart racing, fluttering or pounding which you can experience even on minimal exertion or at rest. Irregular heartbeats, including atrial fibrillation, are both a cause and a consequence of heart failure and significantly increase the risk of stroke.

• Persistent cough or wheezing: Fluid accumulating in the lungs from left heart failure can produce a persistent dry cough or wheezing, particularly when lying down, sometimes called a cardiac cough.

• Sudden weight gain: If someone is gaining weight unexpectedly (one to two kilograms in 24 hours or more than 2 to 3 kilograms over three to five days) it can indicate fluid retention from worsening heart failure. It usually precedes other symptoms of decompensation by one to two days.

• Loss of appetite and nausea: Fluid congestion in the abdomen from right heart failure can produce a sensation of fullness, nausea, loss of appetite and sometimes abdominal discomfort. Patients often describe feeling full after very small amounts of food.

Why These Symptoms Are Often Overlooked

Most early symptoms of heart failure are non-specific and can be caused by many different conditions. Breathlessness, fatigue and leg swelling are frequently attributed to ageing, obesity, anaemia, thyroid disease or simple deconditioning. Cough is attributed to respiratory infections or pollution. Nausea and appetite loss are attributed to gastric problems.

In India, several additional factors delay diagnosis. Healthcare-seeking behaviour is often reactive, with many people seeking care only when symptoms become disabling. Awareness of heart failure as distinct from a heart attack is limited. Women and older adults are more likely to present with atypical symptoms. The overlapping symptoms create further diagnostic confusion.

The Stages of Heart Failure Explained

Heart failure is classified by the New York Heart Association (NYHA) into four functional classes based on symptom severity.

• Class I (no limitation): No symptoms with ordinary physical activity. Heart failure is identified on testing but causes no functional limitation.

• Class II (mild limitation): Comfortable at rest. Ordinary activity causes breathlessness, fatigue or palpitations, such as climbing stairs or walking uphill.

• Class III (marked limitation): Comfortable at rest. Symptoms occur with less than ordinary activity, such as walking slowly or dressing. Daily activities are significantly curtailed.

• Class IV (symptoms at rest): Unable to carry on any physical activity without discomfort. Symptoms are present even at rest and worsen with any physical effort.

Risk Factors That Increase Your Chances

Certain factors increase the risk of heart failure. They are

• Hypertension (high blood pressure): Chronically elevated blood pressure forces the heart to work harder causing the left ventricle to enlarge and eventually fail

• Coronary artery disease (CAD) and prior heart attack: Damage to heart muscle from a previous heart attack reduces pumping capacity and is a major cause of heart failure

• Diabetes mellitus: Uncontrolled diabetes damages the heart muscle directly (diabetic cardiomyopathy) and accelerates coronary artery disease

• Valvular heart disease: Rheumatic heart disease, which remains prevalent in India due to inadequately treated streptococcal throat infections in childhood, causes valvular damage leading to heart failure in adulthood.

How Heart Failure Is Diagnosed

Heart failure is diagnosed through clinical assessment and key investigations. They are:

• Echocardiogram: The most important test to assess heart function and measures the ejection fraction (EF) and identifies the type of heart failure

• NT-proBNP or BNP blood test: Elevated BNP or NT-proBNP levels strongly support a diagnosis of heart failure and are used to guide treatment intensity and monitor response

• Chest X-ray: A chest X-ray shows an enlarged heart and pulmonary congestion

• ECG: An ECG identifies arrhythmias and evidence of prior heart attack

• Blood tests: Assess kidney function, electrolytes and anaemia (all of which affect heart failure management).

Treatment and Management Options

Heart failure is a chronic condition that requires lifelong management. Modern treatment is highly effective at controlling symptoms and slowing progression.

• Disease-modifying medications: The four pillars of medical treatment for HFrEF are ACE inhibitors or ARBs, beta-blockers, mineralocorticoid receptor antagonists and SGLT2 inhibitors. Together, these four drug classes reduce mortality from heart failure by a lot.

• Diuretics for symptom control: Diuretics remove excess fluid and relieve breathlessness and swelling. They are the cornerstone of symptomatic management but do not modify the underlying disease.

• Lifestyle modifications: Sodium restriction (less than 2 to 2.5 grams per day, meaning avoiding papad, pickles, processed snacks and added table salt), daily weight monitoring, smoking cessation and alcohol avoidance all contribute meaningfully to outcomes.

When to Seek Emergency Care

The following symptoms require immediate emergency medical attention.

• Sudden severe breathlessness at rest, particularly if accompanied by frothy or pink-tinged sputum

• Sudden rapid weight gain of more than 2 kilograms in 24 hours

• Rapidly worsening leg and abdominal swelling

• New or worsening chest pain, particularly if it radiates to the arm or jaw

• Fainting, near-fainting or sudden severe lightheadedness

Conclusion: Protecting Your Heart Early

Heart failure begins silently. The seven early warning signs including breathlessness, fatigue, leg swelling, rapid heartbeat, persistent cough, sudden weight gain and loss of appetite, are easy to dismiss individually but demand urgent cardiac evaluation when recognised together in someone with known risk factors such as hypertension, diabetes or coronary artery disease.

Early diagnosis and prompt initiation of the four evidence-based drug classes now available for heart failure can stabilise or even improve heart function over time. Do not wait for symptoms to become disabling. If any of these signs are new or worsening, speak to a cardiologist promptly.

1. Can heart failure develop without noticeable symptoms?

Some patients have significant impairment of cardiac function with very mild or no symptoms at rest. This is sometimes called asymptomatic left ventricular dysfunction and is often discovered incidentally during routine health screening. Treatment is still recommended at this stage to prevent progression to symptomatic heart failure.

2. Can heart failure symptoms come and go?

Symptoms of heart failure can fluctuate significantly, improving with medication or rest and worsening with dietary indiscretion (excess salt or fluid), missed medications, intercurrent illness or physical overexertion.

3. Can heart failure affect daily activities and quality of life?

Yes and significantly. As heart failure progresses, activities including walking, climbing stairs, cooking, bathing and dressing can become difficult or impossible. However well-managed heart failure allows most patients to maintain meaningful activity levels for years.

4. Can heart failure be reversed or cured completely?

In some cases, yes. If heart failure is caused by a reversible condition, such as a tachycardia-induced cardiomyopathy from a prolonged rapid heart rate, alcohol-related cardiomyopathy in a patient who stops drinking or peripartum cardiomyopathy in a woman after delivery, cardiac function may recover significantly or fully. For most patients with heart failure from coronary artery disease or hypertension, the condition is managed rather than cured, though modern treatment can substantially improve function.

5. Can people with heart failure live a normal life?

Many people with well-controlled heart failure live active, fulfilling lives. With appropriate medication, lifestyle modification, regular follow-up and supervised exercise, patients can maintain normal or near-normal daily activities for years.

6. Can stress or lack of sleep worsen heart failure?

Psychological stress activates the sympathetic nervous system, raises heart rate & blood pressure and increases the work the heart must perform. Chronic stress is independently associated with worse outcomes in heart failure. Poor sleep, particularly obstructive sleep apnoea causes repeated nocturnal oxygen desaturation and sympathetic activation that worsens cardiac function over time.

7. Can heart failure cause weight gain even without overeating?

Weight gain in heart failure is typically due to fluid retention (oedema) rather than fat accumulation. The failing heart reduces blood flow to the kidneys, which respond by retaining sodium and water, causing fluid to accumulate in the lungs, legs and abdomen. A gain of more than one kilogram per day or two kilograms within three days should be reported to the cardiologist immediately as it indicates worsening fluid overload.

8. Is it safe to exercise if you have heart failure?

Yes, when prescribed and supervised appropriately. Supervised exercise rehabilitation (cardiac rehabilitation) has been shown to improve exercise capacity, reduce hospitalisation and improve quality of life in patients with stable heart failure. Vigorous exercise without medical guidance is not appropriate in heart failure.

9. What foods should people with heart failure limit or avoid?

People with heart failure should limit sodium intake to less than 2 to 2.5 grams per day, which means avoiding papad, pickles, salted snacks (namkeen, chips, biscuits), instant noodles, processed meats and adding salt at the table. Excess fluid intake should be limited if advised by the cardiologist. Alcohol should be avoided entirely or strictly limited. High-potassium foods may need to be moderated if the patient is on potassium-sparing medications.

10. How can I support a family member living with heart failure?

The most important things family members can do are: help with daily weight monitoring and medication adherence, accompany the patient to cardiology appointments, prepare low-sodium meals, recognise the warning signs of worsening and help the patient seek care promptly, provide emotional support without over-restricting the patient's independence, and understand that fatigue and breathlessness are real symptoms and not exaggeration.

References

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2. Yancy CW, Jessup M, Bozkurt B, et al. 2013 ACCF/AHA guideline for the management of heart failure. J Am Coll Cardiol. 2013;62(16):e147–239. https://doi.org/10.1016/j.jacc.2013.05.019

3. Guha K, McDonagh T. Heart failure epidemiology in Asia: challenges and opportunities. JACC: Asia. 2021;1(1):56–65. https://doi.org/10.1016/j.jacasi.2021.04.007

4. McMurray JJV, Solomon SD, Inzucchi SE, et al. Dapagliflozin in patients with heart failure and reduced ejection fraction. N Engl J Med. 2019;381(21):1995–2008. https://doi.org/10.1056/NEJMoa1911303

5. Bocchi EA, Arias A, Verdejo H, et al. The reality of heart failure in Latin America. J Am Coll Cardiol. 2013;62(11):949–58. https://doi.org/10.1016/j.jacc.2013.06.013