What Is Heart Failure with Reduced Ejection Fraction (HFrEF)?

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Heart failure with reduced ejection fraction (HFrEF) is a type of heart failure where the heart's main pumping chamber does not squeeze out enough blood with each beat.[1][2][3]

HFrEF happens when the left ventricle, the heart's primary pumping chamber, weakens and pumps less blood than normal. This condition, also called systolic heart failure, leads to reduced blood flow to the body, which can cause fluid buildup and strain on other organs. People may experience symptoms like shortness of breath or fatigue because the heart struggles to meet the body's needs.[1][3][5]

Key Takeaways

• HFrEF is defined by an ejection fraction of 40% or less.[1][2][3]
• It affects the heart's ability to pump blood effectively during contraction.[1][3]
• Common tests include echocardiograms to measure ejection fraction.[1]
• Doctors typically use a mix of lifestyle changes and medications to manage it.[1][4]
• Early detection through symptoms and tests can help guide care.[1]

What Causes HFrEF?

HFrEF develops when the heart muscle weakens, often due to damage from conditions like a heart attack, high blood pressure, or coronary artery disease. Over time, the left ventricle enlarges and loses its ability to contract strongly, a process called adverse cardiac remodeling. This reduces the amount of blood pumped out with each heartbeat, leading to inadequate oxygen delivery to the body.[1][4][8]

Risk factors include long-standing high blood pressure, diabetes, prior heart attacks, and certain infections or toxins that harm heart muscle. In some cases, heart valve problems or irregular rhythms contribute. People may notice gradual changes, but sudden worsening can occur if the underlying cause progresses.[1][2][7]

The heart tries to compensate by beating faster or growing larger, but these changes often worsen the problem over time. Fluid can back up into the lungs or legs, causing congestion. Understanding these causes helps explain why doctors focus on managing risk factors alongside heart function.[4][5]

What Are the Symptoms of HFrEF?

People with HFrEF may experience shortness of breath, especially during activity or when lying flat, due to fluid buildup in the lungs. Fatigue and weakness occur because less blood reaches muscles and organs. Swelling in the legs, ankles, or abdomen is common from fluid retention.[1][2][7]

Other signs include a persistent cough, rapid weight gain from fluid, reduced ability to exercise, and trouble concentrating. Symptoms can vary; some people feel mostly tired, while others have more breathing issues. These often worsen over time if unmanaged.[1][3][8]

In advanced stages, people may feel full quickly when eating or have trouble sleeping without propping up. Not everyone has all symptoms, and they can mimic other conditions, so tracking changes is key.[7]

How Is HFrEF Diagnosed?

Doctors start with a medical history and physical exam, asking about symptoms like fatigue or swelling and checking for risk factors such as high blood pressure. They listen to the heart and lungs for unusual sounds.[1][2]

The main test is an echocardiogram, which uses sound waves to create pictures of the heart and measure ejection fraction (EF)—the percentage of blood pumped out with each beat. Normal EF is 50-70%; HFrEF is confirmed at 40% or less.[1][3][6]

Other tests include an electrocardiogram (ECG) to check heart rhythm and blood tests for strain markers. Doctors may order chest X-rays or stress tests to assess overall function. These steps help rule out other issues and classify the type of heart failure.[1][7]

How Do Doctors Manage HFrEF?

Doctors typically recommend lifestyle changes like a low-salt diet, regular moderate exercise as tolerated, and weight monitoring to reduce fluid buildup. Quitting smoking and limiting alcohol support heart health.[1][4]

Medication options can include beta-blockers to slow the heart rate, ACE inhibitors or ARBs to ease blood vessel strain, and mineralocorticoid receptor antagonists to manage fluid. Newer options like SGLT2 inhibitors may help lower risks of worsening. Devices or procedures are considered for some cases.[1][4][8]

Care is tailored; doctors may adjust based on response. Regular follow-ups track EF and symptoms to guide next steps. Research shows these approaches can improve quality of life and outcomes.[4][8]

When to talk to your doctor

Contact your doctor if you notice new or worsening symptoms like sudden shortness of breath, unexplained weight gain of 2-3 pounds in a day, swelling, or dizziness. People may experience fatigue that limits daily activities or coughing at night. These signs can indicate fluid buildup or reduced heart function, and prompt check-ins help doctors assess and adjust care plans.[1][2]

Frequently asked questions

Q: How is HFrEF different from other types of heart failure?
HFrEF involves reduced pumping (EF ≤40%), while heart failure with preserved ejection fraction (HFpEF) has normal EF (≥50%) but stiff ventricles. Mid-range (HFmrEF) is 41-49%.[3][6][7]

Q: Can ejection fraction improve with treatment?
Yes, some people see EF rise with management, called heart failure with improved ejection fraction. Doctors monitor this through repeat tests.[3][7]

Q: Is HFrEF the same as systolic heart failure?
Yes, HFrEF is often called systolic heart failure because it affects the squeezing phase when the heart pumps blood out.[3][5]