Understanding Your HFrEF Diagnosis and Treatment Plan

Hearing the words “heart failure” can be a terrifying experience, often bringing to mind a heart that has stopped beating entirely. However, in medical terms, heart failure (HF) does not mean your heart has failed to function; it means your heart is not pumping blood as efficiently as your body needs ^[1].

For many people, a diagnosis of Heart Failure with reduced Ejection Fraction (HFrEF)—often called systolic heart failure—is the start of a journey toward recovery and stabilization rather than an end point. With modern treatments, the heart often has a remarkable ability to heal and reshape itself over time.

Understanding the HFrEF Diagnosis

Your diagnosis is based on how well your heart’s left ventricle (the main pumping chamber) is working. This is measured by Ejection Fraction (EF), which is the percentage of blood the heart pumps out with each beat.

• HFrEF (Reduced): Your EF is 40% or lower ^[1][2].
• HFmrEF (Mildly Reduced): Your EF is between 41% and 49% ^[1].
• HFpEF (Preserved): Your EF is 50% or higher, but you still have symptoms of heart failure along with objective clinical evidence like elevated filling pressures ^[1][2].

A formal diagnosis of heart failure requires more than just a low EF number. A low EF alone without a clinical syndrome is often termed asymptomatic systolic dysfunction. Your doctors also look for clinical signs like congestion (fluid buildup in the lungs or ankles), shortness of breath, fatigue, or elevated levels of specific proteins in the blood called natriuretic peptides ^[1][3].

The Goal: Improved Ejection Fraction (HFimpEF)

One of the most encouraging aspects of a HFrEF diagnosis is the possibility of HFimpEF (Heart Failure with improved Ejection Fraction). This occurs when a patient who started with an EF of 40% or lower sees their EF increase by at least 10 percentage points, reaching a final measurement above 40% ^[1].

Research shows that many patients experience significant improvement after starting Guideline-Directed Medical Therapy (GDMT)—the standard combination of medications designed to support the heart.

• In specific groups of newly diagnosed patients, between 34% and 63% achieved improved heart function within 3 to 6 months of starting treatment, though this varies greatly by the cause of the heart failure and the population studied ^[4][5].
• Improvement can continue over a long period; one observational study found that while 46% of patients improved by day 90, that number rose to 77% by the end of one year ^[5].

Why Treatment is Lifelong

If your heart function improves or even returns to a “normal” range (50% or higher), you may feel like you are “cured.” However, doctors view this as remission rather than a permanent cure. The underlying heart muscle has reached a stable state because the medications are shielding it from stress ^[6][7].

Stopping these medications can lead to a “relapse,” where the heart function drops again and symptoms return.

• In a major study called TRED-HF, which looked specifically at recovered dilated cardiomyopathy, approximately 40% of patients who stopped their heart failure medications saw their heart function decline again within just six months ^[8].
• Over a longer period of five years, more than 60% of those in that withdrawal group experienced a relapse ^[8].

Because the risk of the heart weakening again is high, current medical guidelines strongly recommend continuing your heart medications indefinitely, even if you feel perfectly healthy and your heart tests look normal ^[6][7].

Moving Forward with Your Care

Your care team will focus on optimizing your medications to help your heart pump more effectively. This often involves “uptitrating,” or slowly increasing the doses of your heart failure drugs to the levels proven to be most effective and safely tolerated. Your specific “phenotype”—the unique way your heart failure behaves—will guide which treatments are the best fit for you.