Heart Failure

Heart failure is one of the most common cardiovascular diagnoses worldwide, yet the term is frequently misunderstood. The heart does not suddenly stop (that would be cardiac arrest); rather, it loses the capacity to pump blood with sufficient force or to fill properly between beats. As a result, organs and tissues throughout the body receive less oxygen than they need, and fluid backs up into the lungs (causing breathlessness) or the legs and feet (causing swelling).

There are two main types. In heart failure with reduced ejection fraction (HFrEF), the left ventricle — the main pumping chamber — becomes weakened and can no longer contract forcefully enough to push an adequate volume of blood out with each beat. In heart failure with preserved ejection fraction (HFpEF), the heart muscle becomes stiff rather than weak; it contracts normally but cannot relax and fill adequately between beats. Common causes include coronary artery disease (where narrowed arteries reduce blood supply to the heart muscle), high blood pressure, prior heart attacks, cardiomyopathy, and valve disease.

Symptoms typically include shortness of breath during activity or when lying flat, persistent fatigue, swelling in the legs and ankles, and sudden weight gain from fluid retention. Diagnosis involves a combination of clinical evaluation, echocardiogram, blood tests (including a marker called BNP or NT-proBNP), and sometimes imaging of the coronary arteries. Treatment has advanced considerably and includes medications that reduce the heart's workload, improve its efficiency, and prevent progression, as well as devices like implantable defibrillators or cardiac resynchronization devices in appropriate cases.

Heart failure is a serious but manageable condition, and the outlook for people with it has improved significantly over the past few decades thanks to better medications and a clearer understanding of the disease's mechanisms. What has not changed is the importance of early recognition and consistent management. Heart failure that goes unrecognized or is poorly controlled tends to worsen over time and leads to hospitalizations and complications that are harder to reverse.

Many of the risk factors for heart failure — high blood pressure, diabetes, obesity, and coronary artery disease — are addressable. Treating those conditions aggressively reduces the risk of developing heart failure in the first place. For people who already have a diagnosis, staying on prescribed medications, monitoring weight daily (sudden gains signal fluid buildup), limiting salt, and attending regular follow-up appointments are among the most effective things you can do to maintain quality of life and slow disease progression.