Heart Failure

Overview

Heart failure is a condition in which the heart is unable to pump enough blood to meet the body's needs. The heart does not stop working — but it works less powerfully or less efficiently than it should. As a result, the body does not receive enough blood and oxygen, fluid begins to build up in the tissues, and over time everyday activities like breathing, walking, or climbing stairs become increasingly difficult.

Heart failure does not develop overnight. It usually progresses gradually over many years, and in the early stages the symptoms can be so subtle that a person dismisses them as simply getting older. This is one reason why the diagnosis is often made later than it could be.

Heart failure is very common worldwide. Among people over 65, it is one of the most frequent reasons for hospital admission. It affects millions of people and represents both a serious health condition and one that can significantly affect quality of life.

The good news is that heart failure is a condition that can be managed very effectively with the right treatment and lifestyle changes. Many people with heart failure live well for many years with appropriate care. Early diagnosis and regular monitoring make a decisive difference to what is possible.

Types of Heart Failure

Heart failure is not a single condition — it can develop in several different ways. Your doctor will tell you which type you have, and this matters because it influences the best treatment approach and helps predict how the condition is likely to behave.

• Left-sided heart failure. The most common type. The left side of the heart is responsible for pumping blood out to the body. When it cannot do this effectively, blood backs up into the lungs and breathlessness develops. Left-sided heart failure comes in two subtypes. In the first, the heart muscle has become weak and pumps with reduced force. In the second, the heart muscle has become stiff and cannot fill properly with blood, even though it may still squeeze normally. These two subtypes are managed differently.
• Right-sided heart failure. The right side of the heart receives blood from the body and pumps it to the lungs. When the right side weakens, blood backs up into the veins of the body — causing swelling in the legs, ankles, and abdomen, and sometimes fluid around the liver. Right-sided heart failure often develops as a consequence of left-sided heart failure.
• Biventricular heart failure. When both sides of the heart are affected simultaneously, symptoms from both sides are present together.

Heart Failure Stages

Heart failure is classified into four stages. This classification was developed by the New York Heart Association and helps doctors understand how far the condition has progressed and plan treatment accordingly.

• Stage 1 (Class I). Heart failure is present but has not yet affected daily life. Normal activities do not cause breathlessness or fatigue. At this stage, the condition is often discovered by chance during tests done for another reason.
• Stage 2 (Class II). Mild limitation. You feel fine at rest, but moderate activities — such as climbing stairs, walking briskly, or doing heavy housework — cause breathlessness or tiredness.
• Stage 3 (Class III). Marked limitation. You feel comfortable at rest, but even light activities — such as walking slowly on level ground or getting dressed — cause noticeable breathlessness and fatigue.
• Stage 4 (Class IV). Severe limitation. Symptoms are present even at rest. No physical activity can be carried out without discomfort.

Moving to a higher stage is not an inevitable outcome of heart failure. With the right treatment and lifestyle changes, many people are able to move back to a better stage or remain stable at their current stage for a long time.

Symptoms

Heart failure symptoms vary from person to person and depend on how far the condition has progressed. Symptoms that begin only during strenuous activity can gradually appear with lighter activity and eventually even at rest.

Heart failure symptoms include the following:

• Shortness of breath. The most common and most disruptive symptom. Breathlessness that at first only appears with exercise — climbing stairs or walking briskly — can over time occur with gentle activity or even while sitting still. Struggling to breathe when lying flat is an important sign of heart failure; many people find themselves propping themselves up on extra pillows or even needing to sleep sitting up. Waking in the night suddenly gasping for breath is another characteristic feature.
• Swelling in the legs and ankles. When the heart cannot pump efficiently, fluid accumulates in the body. Gravity pulls this fluid downward, causing it to collect in the legs, ankles, and feet. This swelling tends to be worse in the evening and better after a night's sleep. In more advanced cases, fluid can also build up in the abdomen, causing a sense of bloating and fullness.
• Extreme tiredness and weakness. When the muscles and organs are not receiving enough blood, energy production falls. An unusual fatigue that comes on during activities that never used to cause tiredness, a persistent sense of exhaustion, and feeling drained even after rest are all important but frequently overlooked signs of heart failure.
• Rapid weight gain. Fluid accumulation can cause noticeable weight gain over just a few days. Gaining more than half a kilogram in a single day, or more than 2 kilograms in a week, is an important warning sign that deserves prompt attention.
• Cough and wheezing. Fluid in the lungs can produce a persistent cough or a wheezing sound when breathing. This cough tends to be worse when lying down and may occasionally bring up pink or frothy mucus.
• Palpitations. In an effort to compensate for reduced pumping efficiency, the heart may beat faster. This can produce a noticeable sensation of the heart pounding or beating irregularly.
• Loss of appetite and nausea. Reduced blood flow to the digestive system, or fluid building up in the abdomen, can cause a feeling of fullness, loss of appetite, and nausea.
• Difficulty concentrating and mental fogginess. Reduced blood flow to the brain can make thinking, focusing, and making decisions harder. This is particularly noticeable in older patients.

Many of these symptoms, taken individually, could point to other conditions. But when breathlessness, leg swelling, and unusual tiredness occur together, heart failure should always be considered and evaluated.

When to See a Doctor

Heart failure symptoms can start gently and feel like a normal part of getting older. But dismissing them allows the condition to advance without the management it needs.

Schedule a medical evaluation if:

• Activities that never left you breathless before are now making you short of breath
• You have noticed obvious swelling in your legs or ankles
• Unexplained fatigue and weakness have been gradually increasing over recent weeks
• You have gained weight unexpectedly over just a few days
• You are struggling to breathe when lying flat or are waking in the night unable to breathe
• You already have a heart failure diagnosis and your existing symptoms are getting worse

Call emergency services immediately if:

• You develop sudden severe breathlessness, particularly if accompanied by pink or frothy sputum
• You develop chest pain
• You faint or your level of consciousness changes
• Your heart suddenly feels very fast, very slow, or very irregular

Causes

Heart failure does not arise on its own — there is always an underlying cause. Finding that cause shapes the treatment approach and helps predict how the condition will behave.

• Coronary artery disease and heart attack. The most common cause. Narrowing or blockage of the heart's own blood vessels reduces the supply of blood to the heart muscle. A heart attack permanently damages an area of heart muscle, and this damage can persistently weaken the heart's pumping ability.
• High blood pressure. Years of elevated blood pressure force the heart to work harder than it should. Over time, this extra effort causes the heart muscle to thicken, tire, and weaken. High blood pressure is one of the most common causes of heart failure — and one of the most preventable.
• Heart valve problems. The valves in the heart ensure blood flows in the right direction. When a valve does not close properly or does not open fully, the heart has to work much harder to compensate and gradually becomes exhausted.
• Heart muscle disease. Conditions that directly affect the heart muscle (called cardiomyopathy) can cause it to become enlarged, stiff, or weak. This can sometimes result from long-term heavy alcohol use, infections, or inherited gene changes — and sometimes no specific cause is found.
• Abnormal heart rhythms. When the heart beats too fast or too irregularly for a prolonged period, it cannot pump blood effectively. Persistent rhythm disturbances can eventually lead to heart failure.
• Diabetes. Poorly controlled blood sugar damages both the blood vessels supplying the heart and the heart muscle itself. People with diabetes face a significantly higher risk of heart failure.
• Obesity. Excess body weight increases the demands on the heart and promotes other conditions — high blood pressure, diabetes — that are themselves major causes of heart failure.
• Certain medications and treatments. Some chemotherapy drugs and other medications that are toxic to the heart can damage the heart muscle and contribute to heart failure over time.

Risk Factors

The established risk factors for heart failure include the following:

• Older age. The risk of heart failure rises markedly after age 65. With age, the heart muscle naturally loses some of its reserve capacity and other risk factors accumulate.
• Male sex. Heart failure tends to develop at a younger age in men. In women, however, the risk rises rapidly after menopause and eventually approaches that of men.
• High blood pressure. Uncontrolled hypertension is one of the most important steps on the path to heart failure.
• Coronary artery disease. Narrowing or blockage in the heart's own arteries is a major risk factor.
• Diabetes. People with poorly managed blood sugar have two to three times the risk of developing heart failure.
• Obesity. Excess weight — particularly around the abdomen — both directly burdens the heart and amplifies other risk factors.
• Smoking. Tobacco use directly damages the heart's blood vessels and muscle.
• Excessive alcohol consumption. Long-term heavy drinking weakens the heart muscle over time.
• Sleep apnea. Repeated oxygen drops during sleep impose significant strain on the heart. Untreated sleep apnea increases the risk of heart failure.
• Family history. A family history of heart failure or heart muscle disease raises personal risk.

Complications

When heart failure is not well managed, a range of serious complications can develop over time.

• Kidney failure. Reduced blood flow to the kidneys causes progressive damage. The heart and kidneys are closely interconnected — each affects the other — so managing both together is important.
• Liver damage. In right-sided heart failure, fluid backing up into the liver can damage liver tissue over time.
• Heart rhythm problems. Heart failure creates the conditions for abnormal heart rhythms. Atrial fibrillation and dangerous ventricular rhythm disturbances both increase the risk of hospitalization and of sudden cardiac death.
• Stroke. When the heart is not pumping effectively, or when abnormal rhythms develop, blood clots can form inside the heart and travel to the brain, causing a stroke.
• Lung complications. Chronic fluid in the lungs can permanently reduce breathing capacity over time.
• Muscle loss and malnutrition. In more advanced heart failure, poor appetite, digestive difficulties, and inadequate blood supply to the muscles can lead to significant weight loss and muscle wasting.
• Depression and anxiety. Reduced quality of life, activity limitations, and the challenge of living with a chronic condition create fertile ground for depression and anxiety. These in turn affect treatment adherence and the overall course of the disease.