Heart Failure & The Four Pillars of Therapy
This isn’t just shifting fluid — it’s stopping the heart from remodelling itself to death. Every drug protects the pump.
HFrEF vs HFpEF explained, the four life-saving medication families, and furosemide — what each does, why, and what you must watch for.
Two Types of Failure — Why It Matters
Heart failure is everywhere on medical wards. Breathless, swollen ankles, crackles at the lung bases — but before you treat it, you need to know which kind you’re dealing with. The treatment paths are different, and getting it wrong matters:
- HFrEF — Reduced Ejection Fraction: The heart muscle is weak, stretched, can’t squeeze hard enough. Ejection fraction ≤ 40%. This is where the Four Pillars work best — they can literally extend life.
- HFpEF — Preserved Ejection Fraction: The heart squeezes fine — it just can’t relax and fill properly. Stiff, thick walls. Harder to treat — less about specific drugs, more about managing blood pressure, fluid, and other conditions like diabetes.
1–2 kg gained in a few days? That’s not fat — it’s fluid. Same thing if rings get tight or shoes don’t fit. Weigh at the same time every day, same scales, same clothes. Spot the gain, report it early, prevent the admission.
The Four Pillars — The Drugs That Save Hearts
When the heart struggles, the body floods it with stress chemicals — adrenaline, angiotensin, aldosterone — trying to help. But over time these chemicals remodel the heart: bigger, stiffer, weaker. The Four Pillars block that damage. Each one works differently — and together they’re stronger.
ACE Inhibitors (Ramipril) or ARNI (Sacubitril/Valsartan)
What they do: Open the blood vessels, lower pressure inside the heart, stop the harmful chemical signals that cause scarring. ARNIs go further — they boost the body’s own protective hormones.
Watch for: Dizziness on standing (start low, go slow), dry cough — common with ACEs, switch to ARB if it won’t go away. Potassium rising, creatinine slightly up — expected, but monitor. Report big jumps.
Beta-Blockers (Bisoprolol, Carvedilol, Nebivolol)
What they do: Block the toxic effect of constant adrenaline on the heart. Slow the rate, give more filling time, let the muscle rest and recover.
Watch for: Slow pulse — that’s the point, don’t just stop it. Tiredness, worse symptoms at first — it gets better. Never stop suddenly — can trigger a crisis.
Aldosterone Antagonists (Spironolactone, Eplerenone)
What they do: Stop the hormone that holds salt and water — and causes heart muscle scarring. Direct protection against fibrosis.
Watch for: Potassium — this is the big one. Combined with an ACEi, levels can spike dangerously. Check bloods regularly. Spironolactone can cause breast tenderness in men — worth mentioning.
SGLT2 Inhibitors (Dapagliflozin, Empagliflozin)
What they do: Originally for diabetes — now proven to protect hearts whether diabetic or not. They flush out sugar and extra fluid, lower the workload, and directly protect the muscle.
Watch for: Genital infections — stay hydrated and keep clean. Dizziness from low blood pressure when standing. Rare but serious: ketoacidosis even with normal blood sugars — know the signs.
Shifting the Fluid — Furosemide
The Four Pillars protect long-term — but when a patient comes in gasping, drowning in fluid, they need relief now. That’s where loop diuretics come in.
Furosemide works in the kidney to dump salt and water fast. IV in acute crisis, oral at home. You’ll see urine output shoot up — that’s exactly what we want. But as fluid leaves, so do electrolytes — potassium and magnesium drop, and the kidney function numbers can look worse temporarily. That’s often expected as the excess fluid clears — but keep checking and keep reporting. Fluid balance charts and daily weights tell the full story.
📖 Trusted Guidelines & References
Standards to cite and share — updated and current:
- NICE NG106 — Chronic Heart Failure (last reviewed Sep 2026) — UK gold standard for diagnosis, the Four Pillars, and monitoring.
- British National Formulary (BNF) — Doses, interactions, potassium monitoring, and renal adjustments for every heart drug.
- ESC — European Society of Cardiology Guidelines — International framework for diagnosis and GDMT selection.
Written by: Daniel Hancock, Registered Nurse
Focus: Cardiac care, drug stewardship, patient monitoring
Published: September 2026 | Last reviewed: September 2026
For: UK student nurses — supervised learning only
⚠️ NICE NG106 is the current UK reference. Always confirm medication changes, monitoring plans, and target doses with the medical team — especially when starting or titrating the Four Pillars.