Heart failure is a highly complex and serious physical illness in which the heart cannot pump blood effectively, so the body does not get the blood it needs to function properly. This can happen when excessive force is required to direct blood flow into the heart chambers during filling or emptying. The pump works and what is happening in this pumping causes all sorts of problems, from fatigue and shortness of breath to swelling and fluid retention in the organs. Heart failure does not mean that the heart has stopped working at all. Instead, it means that the heart is unable to work; as a result, blood will accumulate in the lungs, liver, abdomen and legs and there will be an inadequate supply of oxygenated blood to vital organs and tissues.
Heart failure is often misunderstood to mean that the heart has stopped working completely, which is not true, but rather that it is unable to perform its normal pumping action at an optimal level. In heart failure the heart muscle may become weak, stiff, or both, making it difficult to fill with blood properly and pump it through the system. The heart may adaptively enlarge, increase the number of contractions, or increase pressure to pay for this, but eventually, such compensation may fail to meet normal flow demands; inadequate perfusion to various organs occurs, and symptoms of heart failure appear.
Heart failure can be classified into just two types according to the part of the heart affected, systolic heart failure, and diastolic heart failure. Systolic heart failure occurs when the left ventricle of the heart, the chamber that pumps blood to the body, becomes weak and cannot contract hard enough to pump blood effectively. This type is also known as Heart Failure with Reduced Ejection Fraction (HFrEF). On the other hand, diastolic heart failure occurs when the left ventricle cannot relax properly and becomes noncompliant, resulting in impaired blood filling during the relaxation phase of the cardiac cycle. This is also known as Heart Failure with Preserved Ejection Fraction (HFpEF). Although the underlying mechanisms for each will be different, the symptoms of both types of heart failure can be similar.
As mentioned earlier, the causes of heart failure can vary and range from chronic conditions that put too much strain on the heart, to acute events that directly damage the heart. The most common type of heart failure results from coronary artery disease, which is a narrowing or blockage in the blood vessels that carry oxygenated blood to the heart. This eventually restricts flow to the organ and possibly damages the heart muscle from lack of oxygen. High blood pressure (hypertension), which increases the workload on the heart to pump blood; heart attack, which damages the heart muscle; cardiomyopathy, of which refers to diseases of the heart muscle itself; and valvular heart disease, which means damage or disease of the heart valves that prevents proper functioning, are all common causes of heart failure. Other common risk factors include diabetes, obesity, smoking, excessive alcohol consumption, and certain infections or inflammatory diseases that affect the heart.
The development and course of heart failure depend on the various conditions responsible for it and the general health of the person. In the early stages, it may not produce observable symptoms, but as the disease progresses, the patient may experience shortness of breath during effort or even while resting; symptoms of fatigue; and swelling in the legs, ankles, or abdomen; and tightness in the chest. In advanced stages, fluid may accumulate in the lungs, making it difficult for the person to breathe even while resting, and the heart may not be able to maintain a regular rhythm, leading to arrhythmias or irregular heartbeats. Untreated heart failure can lead to life-threatening consequences such as organ failure, pulmonary edema (fluid buildup in the lungs), and death.
The diagnosis of heart failure typically begins with a detailed medical history and a thorough physical examination, during which the health care worker will look for signs and symptoms of heart failure, including retention of fluids, abnormal heart auscultation, and signs of inadequate circulation. Blood tests may also be performed to measure the levels of certain biomarkers such as brain natriuretic peptide (BNP) that may indicate heart failure. Imaging studies — such as echocardiography, which applies sound waves to obtain an image of the heart's structure and function — are widely used to evaluate the heart's pumping ability and the condition of its chambers and valves. Chest X-rays, electrocardiograms (ECGs), or magnetic resonance imaging (MRIs) are sometimes necessary for additional evaluation.
Management of heart failure usually involves lifestyle adjustments, medications, and surgery when needed. Lifestyle modifications include dietary modifications, such as reducing salt intake to prevent fluid retention; moderate engagement in exercises for cardiovascular fitness; weight management to relieve stress on the heart. Other lifestyle aspects that patients are advised to avoid are smoking, alcohol consumption, and stress management. Such factors tend to worsen the condition. A healthy lifestyle is very beneficial in slowing down the progression of the disease to improve one's quality of life.
However, the cornerstone of heart failure treatment is primarily made up of medication. There are different classes of drugs that can be used in treating heart failure, and each acts differently relative to the condition. The most commonly used angiotensin-converting enzyme and angiotensin II receptor blockers are prescribed to relax blood vessels, lower blood pressure, and increase blood flow to reduce the burden on the heart. Beta blockers are for slowing the heart rate, decreasing blood pressure, preventing arrhythmias. The most common diuretic use is to promote the excretion of excess water within the body, thereby reducing swelling and breathlessness. Other medications include aldosterone antagonists and some heart failure specific agents, such as sacubitril/valsartan which improve heart function and prevent hospitalization.
On some occasions, surgery may be required whenever drug therapy proves insufficient. Such medical procedures may include heart valve repair, pacemaker implantation, and bypass surgery or CABG (coronary artery bypass grafting) to bypass blocked arteries. Sometimes, the surgeon deploys a left ventricular assist device to achieve maximum efficiency for blood delivery until the patient's heart is unable to function adequately considering all medical interventions, in which case heart transplantation is considered a last resort.
Researchers are also looking into using artificial intelligence or machine learning to predict and monitor heart failure to help improve the diagnosis, treatment, and outcome of people suffering from this condition. Special applications of newly approved heart failure treatments in addition to traditional management techniques include gene therapy, regenerative medicine, and new applications of chemical molecules targeting the underlying molecular mechanisms of heart failure.
Despite various treatments, heart failure is one of those chronic conditions that require constant management. Most patients with heart failure can lead absolutely normal lives if properly cared for, but it has been said earlier that constant monitoring and changes in therapy are required throughout life. Heart failure is progressive, and just as all patients cannot be treated the same, there are no exceptions when it comes to individual care to manage it. For some, it may remain stable for many years; for others, it will get worse.
Morphological and functional changes of the heart, constitutional and other diseases, daily habits, and medical therapy constitute a very complex multifactorial scenario that is defined as heart failure or cardiac insufficiency. Such a large number of cases poses a tremendous health burden on mankind, affecting millions of people and contributing to considerable morbidity and mortality in the world. Initiatives to improve outcomes in heart failure patients and reduce the public health impact of this condition will require early detection, effective treatment, and tailored management for patients with heart failure. As more research continues and advances are made in this field, magnetic hope exists for the development of more effective treatments to improve prognosis in individuals with heart failure.
