--- title: "Heart failure, what the diagnosis means and how it is treated" description: "What heart failure means, how it is diagnosed with blood tests and echocardiography, and how modern medication improves symptoms and outcomes." url: "https://www.drmartins.org/conditions/heart-failure/" author: "Dr Joao Martins" medical_reviewer: "Dr Joao Martins" review_status: "approved" date_published: "2026-09-01" date_modified: "2026-09-01" --- # Heart failure, what the diagnosis means and how it is treated Heart failure means the heart is not pumping efficiently enough to meet the body's needs, usually causing breathlessness, fatigue and fluid retention. It is not the same as the heart stopping, and it is not a terminal diagnosis for most people. It is a syndrome with several possible underlying causes, including coronary artery disease, high blood pressure, valve disease and rhythm disturbance. Diagnosis rests on symptoms, a natriuretic peptide blood test and an echocardiogram. Modern medical treatment substantially improves symptoms, hospital admissions and survival. ## When to seek urgent help Call 999 if you become severely breathless at rest, cannot lie flat, or have chest pain. Contact your clinical team promptly if you gain more than two kilograms in two to three days, or if swelling or breathlessness worsens noticeably. ## Key facts - Heart failure describes how the heart is functioning; identifying the underlying cause is a separate and necessary step. - A normal natriuretic peptide blood test makes untreated heart failure considerably less likely. - An echocardiogram distinguishes heart failure with reduced ejection fraction from heart failure with preserved ejection fraction. - Four classes of medication now form the foundation of treatment for reduced ejection fraction. - Daily weight, salt and fluid awareness, activity and vaccination are all part of routine management. ## What the term actually means Heart failure is one of the least helpful names in medicine. It does not mean the heart is about to stop. It means the heart is not pumping, or not filling, efficiently enough to meet the body's demands without raised pressures. The consequence is breathlessness, tiredness and a tendency to retain fluid. It is a syndrome rather than a single disease, which is why identifying the underlying cause matters. Coronary artery disease and previous heart attacks, long-standing high blood pressure, heart valve disease, atrial fibrillation, disease of the heart muscle itself, and the effects of alcohol or certain medicines can all lead to it. ## The two main types An echocardiogram measures the ejection fraction, the proportion of blood the main pumping chamber expels with each beat. Where the ejection fraction is reduced, the pumping action itself is weakened. This type has the strongest evidence base and a well-established set of treatments. Where the ejection fraction is preserved, the heart contracts normally but is stiff and does not relax and fill properly. It is more common in older people and in those with high blood pressure, diabetes or obesity. Treatment focuses on the underlying conditions and on fluid management, and the range of proven medications has expanded in recent years. ## How the diagnosis is made Assessment combines symptoms with examination for raised pressure in the neck veins, added heart sounds, chest crackles and swelling. A natriuretic peptide blood test is central: a normal result in an untreated patient makes heart failure considerably less likely, while a raised result prompts echocardiography. The echocardiogram then confirms the diagnosis and, importantly, shows why: whether there is scarring from previous infarction, valve disease, thickening of the muscle or chamber enlargement. An ECG, blood tests and sometimes cardiac MRI or coronary imaging complete the picture. ## Treatment that changes outcome For heart failure with reduced ejection fraction, four classes of medication now form the foundation of treatment, and each has been shown independently to improve symptoms, reduce hospital admission and improve survival. They are typically introduced in sequence and the doses increased gradually, with monitoring of blood pressure, kidney function and potassium. Diuretics are used alongside these to control fluid retention. They relieve symptoms but are not, on their own, disease-modifying treatment. Where the underlying cause is treatable in itself, treating it is part of the plan: revascularisation for coronary disease, intervention for valve disease, rhythm control for atrial fibrillation. Some patients benefit from device therapy, such as a pacemaker that resynchronises the chambers or an implantable defibrillator, and these are considered once medication has been optimised. ## What you can do Weighing yourself daily and reporting a rapid gain, being aware of salt intake, following advice about fluid, keeping physically active within your capacity, and taking up recommended vaccinations all measurably affect how the condition progresses. Cardiac rehabilitation programmes are effective and worth asking about. With modern treatment, many people with heart failure remain active for many years. The purpose of specialist review is to make sure that treatment is genuinely optimised rather than merely present. ## Sources - [Heart failure](https://www.nhs.uk/conditions/heart-failure/) — NHS - [Chronic heart failure in adults (NG106)](https://www.nice.org.uk/guidance/ng106) — NICE --- General information only. It does not replace individual medical advice, diagnosis or emergency care. In an emergency call 999.