Nursing care
Systolic vs diastolic heart failure: HFrEF and HFpEF for the NCLEX
Written and reviewed by Kevin Patel, MSN, RN, CCRN · 4 min read · Updated November 2026
Short answer
Systolic heart failure is a weak pump: the ventricle cannot contract well, and the ejection fraction is 40% or less, now called HFrEF. Diastolic heart failure is a stiff ventricle that pumps normally but fills poorly, with an ejection fraction of 50% or more, called HFpEF. Symptoms look alike, so the ejection fraction decides.
Ejection fraction is the dividing line
The ejection fraction is the share of blood the left ventricle pushes out with each beat. MSD Manuals sets the cutoffs: 40% or less is heart failure with reduced ejection fraction, 50% or more is heart failure with preserved ejection fraction, and 41% to 49% is mildly reduced. An echocardiogram usually provides the number.
The older words map onto the newer ones. Systolic failure is HFrEF, a problem with squeezing. Diastolic failure is largely HFpEF, a problem with relaxing and filling. Students sometimes assume preserved means mild; it does not, since a stiff ventricle can still produce severe congestion.
Why the symptoms will not tell you which one it is
Both types cause shortness of breath on exertion, orthopnea, fatigue, ankle swelling and weight gain from fluid, as MedlinePlus describes. Crackles, a third heart sound and edema can appear in either. No bedside finding reliably separates them, which is why the exam usually gives you the ejection fraction.
BNP can mislead too. MSD Manuals notes that BNP tends to run lower in HFpEF than in HFrEF at the same symptom level, and a normal BNP does not exclude heart failure in HFpEF or obesity. A student who reads a modest BNP as reassurance in an older woman with hypertension and dyspnea has fallen into a common trap.
How treatment differs
HFrEF often follows heart muscle damage, such as a previous heart attack, and coronary artery disease is a common cause. HFpEF is the type students tend to underestimate, because the pump looks normal on the echo while the ventricle stays stiff.
For HFrEF, MSD Manuals lists guideline-directed therapy built from several classes: an SGLT2 inhibitor, a beta-blocker, an angiotensin receptor-neprilysin inhibitor and a mineralocorticoid receptor antagonist. Those drug classes target a weak pump, so the exam expects them for a low ejection fraction. Diuretics relieve congestion in both types.
Nursing care that applies to both
Daily weights at the same time each day, with prompt reporting of rapid gain, catch fluid buildup early. Limit sodium as ordered, track intake and output, and watch for worsening breathlessness, new crackles or rising edema. These steps do not depend on the ejection fraction.
Hypothetical scenario, not a real exam item: a 76-year-old with hypertension and an ejection fraction of 60% asks whether her heart failure is less serious because her heart pumps normally. The best reply explains that her heart muscle is stiff and fills poorly, which can still cause fluid buildup, so weights and salt limits matter. Saying she has no heart failure, or that it is mild because the number is normal, is the tempting wrong answer.
Where the two types meet the left-sided picture
Both systolic and diastolic failure usually start on the left side, so lung congestion is the common thread: crackles, orthopnea and breathlessness on exertion. Right-sided signs such as neck vein distension and leg edema follow when pressure backs up further. The left-versus-right split describes where the congestion shows; the systolic-versus-diastolic split describes why the ventricle fails.
Keeping those two axes separate prevents a common mix-up. A patient can have HFpEF with mainly left-sided symptoms, or HFrEF with both sides involved. When an exam stem gives an ejection fraction, the question is usually about pump function; when it lists crackles against ascites and edema, it is about which side is congested.
Sources and further reading
MSD Manual Professional Version: Heart Failure. Ejection fraction cutoffs for HFrEF, HFmrEF and HFpEF; lower BNP in HFpEF and obesity; guideline drug classes for HFrEF.
MedlinePlus: Heart failure. Systolic as poor contraction (HFrEF) and diastolic as a stiff ventricle that fills poorly (HFpEF); shared symptoms; daily weights and salt limits.
The next step on this is the same as on everything else here: answer questions and read the rationales. Our cardiovascular practice questions are the closest set to what this page covers.
Common questions
What is HFrEF vs HFpEF?
HFrEF is heart failure with reduced ejection fraction, 40% or less, from a weak ventricle that cannot contract well. HFpEF is heart failure with preserved ejection fraction, 50% or more, from a stiff ventricle that does not fill easily.
Which ejection fraction means systolic heart failure?
An ejection fraction of 40% or less fits systolic heart failure, now called HFrEF. Values from 41% to 49% are labeled mildly reduced ejection fraction. The number usually comes from an echocardiogram.
Is diastolic heart failure the same as HFpEF?
Largely, yes. Diastolic heart failure describes a stiff ventricle that fills poorly while pumping power stays normal, which matches HFpEF. MedlinePlus uses the two terms together for this reason.
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