Chronic Heart Failure: Ejection Fraction, the Four Pillars of Treatment and Daily Fluid Control
Heart failure does not mean the heart has stopped. It means it cannot move enough blood to meet demand at a normal filling pressure, so pressure builds up behind it. That backing-up is what produces the symptoms: fluid in the lungs causes breathlessness, fluid in the legs and abdomen causes swelling, and reduced forward flow causes fatigue.
The body then makes it worse in an attempt to help. Sensing low flow, it activates hormonal systems that constrict blood vessels and retain salt and water. That raises blood pressure in the short term and increases the load on an already struggling heart in the long term. Almost every effective heart failure medicine works by blocking one of those compensatory systems rather than by making the heart squeeze harder.
Understanding that explains why the drugs that extend life in heart failure are the ones that slow the heart and lower blood pressure, which sounds like the opposite of what should help.
🫀 The number that decides everything: ejection fraction
Ejection fraction is the percentage of blood in the left ventricle that is pushed out with each beat, measured on an echocardiogram. Normal is 55 to 70 percent. It divides heart failure into categories that are treated differently.
| Type | Ejection fraction | What is wrong | Treatment |
|---|---|---|---|
| HFrEF, reduced | 40 percent or below | The muscle pumps weakly | Four pillars, well established, clear mortality benefit |
| HFmrEF, mildly reduced | 41 to 49 percent | Intermediate | Similar approach, weaker evidence |
| HFpEF, preserved | 50 percent or above | The ventricle is stiff and fills poorly | SGLT2 inhibitor, diuretic, and treating the drivers |
HFpEF is now roughly half of all heart failure, it is more common in older women and in people with hypertension, obesity, diabetes and atrial fibrillation, and until recently there was no treatment that improved its outcomes. SGLT2 inhibitors changed that.
Severity is described separately, by how much activity brings on symptoms:
- 🏃 NYHA I — no symptoms with ordinary activity
- 🚶 NYHA II — symptoms with moderate exertion, such as climbing stairs
- 🧍 NYHA III — symptoms with mild exertion, such as walking across a room
- 🛏️ NYHA IV — symptoms at rest
🔍 Recognising it, and the questions that matter
Three symptoms are specific enough to be worth naming precisely, because patients rarely volunteer them and clinicians have to ask:
- Orthopnoea
- Breathlessness on lying flat. Ask how many pillows are needed to sleep, and whether that number has changed. Going from one pillow to three is a clinical event.
- Paroxysmal nocturnal dyspnoea
- Waking suddenly one to two hours into sleep, gasping, having to sit up or stand at a window. Highly suggestive of heart failure.
- Bendopnoea
- Breathlessness on bending forward, for example to tie shoes. Simple, specific and rarely asked about.
Alongside those: swelling of the ankles worsening through the day, abdominal swelling and early fullness after eating, unexplained rapid weight gain, night-time urination, cough when lying down, and fatigue out of proportion to activity.
🧪 The blood test that settles it. NT-proBNP or BNP is released by stretched heart muscle. Its main strength is ruling heart failure out: a low level in someone breathless makes heart failure very unlikely, which spares unnecessary investigation. Levels are raised by age, kidney impairment and atrial fibrillation, and lowered by obesity, so the result is interpreted alongside the picture rather than alone. An echocardiogram then establishes the ejection fraction and looks at the valves.
🏛️ The four pillars
For heart failure with reduced ejection fraction, four drug classes each independently reduce death and hospitalisation. Used together they are estimated to add several years of life compared with none. All four are started early, at low doses, and increased over weeks — the modern approach is to get all four on board first and optimise doses afterwards, rather than maximising one before adding the next.
| Pillar | What it blocks | Example |
|---|---|---|
| 1. ACE inhibitor, ARB or ARNI | The renin-angiotensin system | Zestril (Lisinopril), Diovan (Valsartan) |
| 2. Beta-blocker | Chronic adrenaline drive | Toprol XL (Metoprolol Succinate), Coreg (Carvedilol), Zebeta (Bisoprolol) |
| 3. MRA | Aldosterone, which drives fibrosis | Aldactone (Spironolactone), 25 mg daily |
| 4. SGLT2 inhibitor | Several mechanisms, not fully explained | Dapavel (Dapagliflozin), 10 mg daily |
💔 Only three beta-blockers are used in heart failure. Metoprolol succinate, carvedilol and bisoprolol are the ones with mortality trials behind them. Metoprolol tartrate, the immediate-release form used for blood pressure, is not interchangeable here. Starting dose is very low, typically metoprolol succinate 12.5 to 25 mg or bisoprolol 1.25 mg daily, doubled every two weeks as tolerated. Symptoms sometimes worsen briefly in the first weeks; that is expected and is not a reason to stop. Beta-blockers are never stopped abruptly.
Two further points about the SGLT2 inhibitors, because they are the genuine advance of the last few years: they work whether or not the person has diabetes, and they are the first class to improve outcomes in preserved ejection fraction as well as reduced.
💧 Diuretics: symptom control, and how flexible dosing works
Diuretics do not extend life. They do something the four pillars cannot: remove the fluid that makes people breathless, and they work within hours. Lasix (Furosemide 40/80/100 mg) and Demadex (Torsemide 10/20/40 mg) are the loop diuretics.
- 🌅 Taken in the morning, and a second dose if needed by early afternoon, so the effect does not disrupt sleep
- 🚽 Furosemide acts within an hour and lasts about six, which is why it produces a concentrated few hours of urination rather than a whole day
- 📊 Torsemide is absorbed more reliably, which matters when gut congestion is limiting furosemide absorption
- ⚖️ The dose is titrated to weight and symptoms, not fixed forever
- 🩸 Potassium, sodium and kidney function are monitored, since loop diuretics deplete potassium and magnesium
⚖️ The daily weight rule, which prevents most admissions. Weigh yourself every morning, after urinating, before eating, in similar clothing, and write it down. Fluid accumulates for days before breathlessness appears, so the scale sees a decompensation coming.
A gain of more than 2 kg over two to three days means act, not wait. Many patients are given a written plan allowing them to take an extra diuretic dose for two to three days and contact the clinic. That self-management approach reduces hospital admissions substantially, and it only works if the weighing is genuinely daily.
💊 Digoxin: where it actually belongs
Lanoxin (Digoxin) is the oldest drug still in use here, extracted originally from foxglove. It increases the force of contraction and slows conduction through the heart, so it helps with symptoms and it controls heart rate in atrial fibrillation.
Its honest position: digoxin reduces hospitalisations but does not reduce mortality. It is added when symptoms persist despite the four pillars, or where rate control in atrial fibrillation is needed, and it is not part of the foundation.
⚠️ Digoxin has a narrow margin between effective and toxic, and toxicity is distinctive.
- Nausea, vomiting, loss of appetite — usually the first signs
- Visual changes: yellow-green tinting, halos around lights, blurred vision
- Confusion, especially in older people
- Palpitations or a very slow pulse — the dangerous manifestation
Risk rises with low potassium and low magnesium, which is why it matters that loop diuretics deplete both, and with declining kidney function, since digoxin is cleared by the kidney. Levels also rise sharply when amiodarone, verapamil, diltiazem, clarithromycin or itraconazole are added, and the digoxin dose is reduced when they are started. The target blood level in heart failure is lower than older textbooks stated, around 0.5 to 0.9 ng/mL, and doses of 0.125 mg daily or lower are usual in older patients and in kidney impairment.
⛔ Medicines that make heart failure worse
This list belongs on any heart failure page and is almost never there.
| Avoid | Why |
|---|---|
| NSAIDs — ibuprofen, diclofenac, naproxen | Cause salt and water retention, blunt diuretics, worsen kidney function. One of the commonest avoidable triggers of decompensation |
| Pioglitazone and rosiglitazone | Cause fluid retention; contraindicated in heart failure. Sold here as Actos and Avandia |
| Verapamil and diltiazem | Reduce contraction force; avoided when ejection fraction is reduced. Sold here as Calan and Cardizem |
| Decongestants containing pseudoephedrine | Raise blood pressure and heart rate |
| High-sodium effervescent tablets | Soluble painkillers and supplements can contain a gram of sodium per tablet |
| Excess alcohol | Directly toxic to heart muscle and a cause of cardiomyopathy in its own right |
Amlodipine and felodipine are the calcium channel blockers considered safe in reduced ejection fraction, when one is needed for blood pressure or angina.
🥗 Daily management that changes outcomes
- Salt under 2 g of sodium daily
- About one teaspoon of salt in total, most of it hidden in bread, processed meat, cheese and ready meals.
- Fluid, where restriction is advised
- Usually 1.5 to 2 litres a day including soup, and it is not applied to everyone. Ice chips and sugar-free chewing gum help with thirst.
- Exercise, which is treatment
- Supervised cardiac rehabilitation improves exercise capacity and quality of life and reduces admissions. The old advice to rest was wrong. Aerobic activity at a level that allows conversation, most days, plus light resistance work.
- Vaccination
- Influenza, pneumococcal and COVID-19. A chest infection is a classic trigger of decompensation, and flu vaccination is associated with lower mortality in heart failure.
- Treating sleep apnoea
- Common in heart failure and worsens it.
- Checking iron
- Iron deficiency is present in around half of heart failure patients, and correcting it intravenously improves symptoms and exercise capacity even when there is no anaemia. Ferritin and transferrin saturation are worth asking about.
- Atrial fibrillation
- Frequently coexists and worsens both conditions. Where present, anticoagulation is usually needed for stroke prevention, with Coumadin (Warfarin) among the options.
🖥️ Beyond tablets
Where ejection fraction stays at or below 35 percent despite optimised medication, two devices are considered. An implantable defibrillator treats the dangerous rhythms that cause sudden death. Cardiac resynchronisation therapy, a specialised pacemaker, helps when the electrical conduction is delayed so that the ventricle walls contract out of step; it improves symptoms and survival in the right patients. For a small number with advanced disease, mechanical support or transplantation is assessed.
🚨 When to get help
Emergency, the same hour:
- Severe breathlessness at rest, or unable to lie down at all
- Pink frothy sputum
- Chest pain
- Fainting, or a pulse that is very fast, very slow or chaotic
- Confusion, or blue lips
Same day contact with the clinic:
- Weight up more than 2 kg in two to three days
- Needing extra pillows, or waking breathless
- Swelling extending up the legs or into the abdomen
- Nausea with yellow-tinged vision on digoxin
- Dizziness on standing, or passing much less urine
- Any new infection, which commonly destabilises heart failure
❓ Frequently asked questions
Does heart failure mean my heart is about to stop?
No. It means the heart cannot move enough blood at a normal filling pressure, so pressure builds up behind it and causes breathlessness and swelling. Many people live for years with well-treated heart failure.
What is ejection fraction and why does it matter?
It is the percentage of blood pushed out of the left ventricle with each beat, normally 55 to 70 percent. At 40 percent or below the pump is weak and the four pillars of treatment apply. At 50 percent or above the ventricle is stiff instead, and the treatment differs.
What are the four pillars of heart failure treatment?
An ACE inhibitor, ARB or ARNI; a beta-blocker; a mineralocorticoid receptor antagonist such as spironolactone; and an SGLT2 inhibitor. Each independently reduces death and hospitalisation, and all four are started early at low doses rather than one at a time to maximum.
Why would a beta-blocker help if it slows my heart?
Because the chronic adrenaline drive that raises heart rate in heart failure also damages the muscle over time. Blocking it improves survival, although symptoms can worsen briefly in the first weeks. Only metoprolol succinate, carvedilol and bisoprolol have this evidence, and they are never stopped abruptly.
How much weight gain should I worry about?
More than 2 kg over two to three days means fluid is accumulating and needs action, not waiting. Weigh every morning after urinating and before eating, and write it down. The scale detects a decompensation days before breathlessness does.
When should I take my water tablet?
In the morning, with any second dose by early afternoon, so it does not disrupt sleep. Furosemide starts working within an hour and lasts about six, which is why it produces a concentrated few hours of urination.
Why does my vision look yellow on digoxin?
That is a classic sign of digoxin toxicity, along with halos around lights, nausea and confusion. It needs prompt medical contact. Risk rises with low potassium or magnesium, worsening kidney function, and when amiodarone, verapamil or clarithromycin are added.
Can I take ibuprofen with heart failure?
Better not. NSAIDs cause salt and water retention, blunt the effect of diuretics and worsen kidney function, and they are among the commonest avoidable causes of decompensation. Discuss alternatives with a doctor.
Should I avoid exercise with heart failure?
No. Supervised cardiac rehabilitation improves exercise capacity and quality of life and reduces hospital admissions. The older advice to rest has been reversed. Aim for activity at a level where conversation is still possible.
Does an SGLT2 inhibitor help if I do not have diabetes?
Yes. These drugs reduce death and hospitalisation in heart failure independently of diabetes, and they are the first class shown to improve outcomes in preserved ejection fraction as well as reduced.
📑 Sources and editorial
- ACC/AHA and ESC guidelines for the diagnosis and management of chronic heart failure
- Mortality trials underpinning the four pillars, including MERIT-HF, CIBIS-II, RALES and the SGLT2 inhibitor heart failure trials in both reduced and preserved ejection fraction
- Prescribing information for metoprolol succinate, lisinopril, valsartan, spironolactone, furosemide, torsemide and digoxin
- Evidence on digoxin serum level targets and the interactions that raise them
- Trials of self-management with flexible diuretic dosing and daily weight monitoring
- Studies of intravenous iron in heart failure with iron deficiency without anaemia
- Related reading: arterial hypertension
- Related products: Toprol XL (Metoprolol Succinate), Lasix (Furosemide), Lanoxin (Digoxin), Aldactone (Spironolactone), cardiovascular category
- RXshop Editorial Team — reviewed by Robert Hayes, MD, FACC — Cardiologist & Cardiovascular Disease Specialist
Medical Disclaimer: The information in this article is for educational and informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek guidance from a qualified healthcare provider with any questions you may have regarding a medical condition, and before starting, stopping or changing any medication.