Wiktor Wise
Ejection fraction (EF) is a measurement, expressed as a percentage, of how much blood the left ventricle pumps out with each heartbeat. It is a crucial indicator of heart health and can be used to diagnose heart failure. A normal EF is between 52% and 74%, with values varying slightly between men and women. While EF is typically associated with the left side of the heart, the right ventricle also plays a significant role in heart function and should not be ignored. This raises the question of whether EF is proportional to the electrical signals that regulate the heartbeat.
| Characteristics | Values |
|---|---|
| Definition | Ejection fraction is a measurement of the percentage of blood pumped out of the ventricles with each heartbeat or contraction. |
| Formula | EF = (SV/EDV) x 100, where SV = stroke volume and EDV = end-diastolic volume |
| Normal Range | 52-72% for men and 54-74% for women; 55-70% according to the American Heart Association |
| Abnormal Range Indications | A higher EF may indicate hypertrophic cardiomyopathy; a lower EF may indicate heart failure or an underlying heart condition |
| Heart Failure with Preserved Ejection Fraction (HFpEF) | Occurs when the heart muscle becomes thick and stiff, reducing ventricular volume but maintaining a normal EF |
| Heart Failure with Reduced Ejection Fraction (HFrEF) | Also called systolic heart failure, where the heart muscle does not contract effectively, resulting in less oxygen-rich blood being pumped out |
| Testing Methods | Echocardiogram, Cardiac MRI (C-MRI), Gated myocardial perfusion imaging with SPECT or PET |
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What You'll Learn
Ejection fraction and heart failure
Ejection fraction (EF) is a measurement used to assess heart failure. It indicates how well the heart is working by measuring the percentage of blood pumped out of the ventricles with each contraction or heartbeat. Typically, the left ventricle is measured as it pumps blood to most of the body's organs. However, recent research suggests that the right ventricle is also important when determining the ejection fraction of the right heart.
A healthy heart has an EF between 50% and 70%. For men, a normal EF range is between 52% and 72%, while for women, it is between 54% and 74%. A lower EF can indicate heart failure, with an EF below 40% classified as heart failure with reduced ejection fraction (HFrEF). This can be caused by cardiomyopathy, when the heart muscle weakens, or coronary artery disease. However, it is important to note that even with a normal EF, an individual can still experience heart failure, known as heart failure with preserved ejection fraction (HFpEF). This occurs when the heart muscle becomes thick and stiff, reducing the volume of blood the ventricle can hold.
Healthcare providers use EF to assess heart failure and determine appropriate treatments. An EF from 41% to 49% is considered mildly reduced and may indicate early cardiomyopathy or risk for heart failure. An EF higher than 75% could also indicate a heart condition such as hypertrophic cardiomyopathy. EF can be measured through imaging techniques such as echocardiograms and cardiac MRI (C-MRI).
EF is an important parameter in understanding and managing heart failure. By regularly assessing EF, healthcare providers can monitor the response to therapy and adjust treatments accordingly. This may include a range of therapies and medications to improve EF and manage symptoms.
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Ejection fraction testing
Ejection fraction (EF) is a measurement, expressed as a percentage, of how much blood the left ventricle pumps out with each heartbeat or contraction. It is an indicator of heart strength and can be used to diagnose heart failure. A normal EF is between 52% and 72% for males and between 54% and 74% for females. An EF that is higher or lower than the normal range may be a sign of heart failure or an underlying heart condition.
There are several methods for measuring ejection fraction, with echocardiograms being the most common. Here are some of the tests used to measure ejection fraction:
- Echocardiogram: This test uses sound waves to create images of the heart. 3-D images are said to provide the most accurate readings.
- Cardiac MRI (C-MRI): This test uses a magnetic field, radio waves, and a computer to create detailed images of the inside of the heart.
- Cardiac catheterization: This involves inserting a thin tube into a vein or artery and guiding it to the heart to measure ejection fraction.
- Cardiac computed tomography (CT) scan: This test uses X-rays and a computer to create detailed images of the heart.
- Multigated acquisition scan (MUGA) or nuclear stress test: This test uses a small amount of radioactive material and a camera to create images of the heart.
These tests can help healthcare providers assess heart function and determine the appropriate treatments for heart failure. It is important to note that even with a normal EF, some individuals can still experience heart failure, known as heart failure with preserved ejection fraction (HFpEF).
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Ejection fraction and heart strength
Ejection fraction (EF) is a measurement, expressed as a percentage, of how much blood is pumped out of the left ventricle of the heart with each heartbeat or contraction. It is calculated by dividing the amount of blood pumped out of the ventricle with each contraction (stroke volume or SV) by the end-diastolic volume (EDV), or the total amount of blood in the ventricle, and then multiplying by 100. This means that EF = (SV/EDV) x 100.
In a healthy heart, the ejection fraction is typically between 50% and 70%. This means that with each heartbeat, 50% to 70% of the blood in the left ventricle gets pumped out to the body. A higher ejection fraction indicates a stronger heart muscle and better heart function, as it shows that the heart is pumping out a greater proportion of the blood that enters it.
A low ejection fraction, on the other hand, means that the heart is having difficulty keeping up with the body's needs. An ejection fraction below 40% is considered heart failure with reduced ejection fraction (HFrEF) and can be due to cardiomyopathy, which is a weakening of the heart muscle. An ejection fraction between 41% and 51% for men and between 41% and 53% for women is classified as mildly reduced and could be a sign of heart damage. An ejection fraction that is too high, such as above 75%, may also indicate a heart condition such as hypertrophic cardiomyopathy.
Ejection fraction is an important indicator of heart strength and can be used to help diagnose heart failure or underlying heart conditions. It is one of many parameters that healthcare providers use to assess heart failure, and it can help determine the severity of heart dysfunction.
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Ejection fraction and underlying heart conditions
Ejection fraction (EF) is a measurement, expressed as a percentage, of how much blood the left ventricle pumps out with each contraction. It is calculated by dividing the amount of blood pumped out of the ventricle with each contraction (stroke volume or SV) by the end-diastolic volume (EDV), or the total amount of blood in the ventricle. A healthy heart typically has an ejection fraction of 50-70%.
A low ejection fraction is often indicative of heart failure. However, it is important to note that even with a normal ejection fraction, heart failure can still occur. This is known as heart failure with preserved ejection fraction (HFpEF) and happens when the heart muscle becomes so thick and stiff that the ventricle holds less blood than usual. An EF from 41-49% is considered mildly reduced and may indicate heart damage, early cardiomyopathy, or risk of heart failure. An EF below 40% usually indicates heart failure or cardiomyopathy.
On the other hand, an EF higher than 75% could indicate a heart condition such as hypertrophic cardiomyopathy. This is a rare but potentially dangerous condition. Other underlying conditions that can cause abnormal ejection fractions include ATTR amyloidosis, cancer treatments causing cardiotoxicity, congenital heart disease, heart attack, heart valve disease, myocarditis, severe high blood pressure, and ventricular arrhythmia.
Ejection fraction is an important parameter used by healthcare providers to assess heart failure and determine the underlying cause. By understanding the ejection fraction, doctors can suggest appropriate treatments and therapies to improve heart function and manage symptoms.
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Ejection fraction and cardiomyopathy
Ejection fraction (EF) is a measurement, expressed as a percentage, of how much blood the left ventricle pumps out with each contraction. It is calculated by dividing the amount of blood pumped out of the ventricle with each contraction (stroke volume or SV) by the end-diastolic volume (EDV), or the total amount of blood in the ventricle. A normal ejection fraction range is between 52% and 72% for men and between 54% and 74% for women. A low ejection fraction is typically a sign of heart failure or an underlying heart condition.
Heart failure occurs when conditions such as cardiomyopathy damage the heart, reducing its ability to pump blood to the body. Cardiomyopathy is a condition where the heart muscle weakens, making it difficult for the heart to pump blood effectively. This can lead to heart failure with reduced ejection fraction (HFrEF), also called systolic heart failure. In this type of heart failure, the heart muscle does not contract effectively, resulting in less oxygen-rich blood being pumped out to the body.
Heart failure with preserved ejection fraction (HFpEF), also known as diastolic heart failure, is another type of heart failure that can be associated with cardiomyopathy. In this condition, the heart muscle contracts normally, but the ventricles do not relax as they should during ventricular filling. This can lead to a reduced amount of blood being pumped out to the body, even though the ejection fraction may fall within the normal range.
An EF measurement under 40% usually indicates heart failure or cardiomyopathy. An EF from 41% to 49% is considered mildly reduced and may indicate early cardiomyopathy or an increased risk for heart failure. An EF higher than 75% could be indicative of hypertrophic cardiomyopathy, a genetic form of heart failure with preserved ejection fraction.
Ejection fraction is an important parameter for healthcare providers to assess heart failure and determine the severity of heart dysfunction. It is often measured using imaging techniques such as echocardiograms and cardiac MRI (C-MRI) to obtain detailed images of the heart and its functioning.
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Frequently asked questions
Ejection fraction is a measurement, expressed as a percentage, of how much blood the left ventricle pumps out with each contraction.
A healthy ejection fraction is generally between 52% and 72% for men and between 54% and 74% for women.
A low ejection fraction can be a sign of heart failure or an underlying heart condition.
Ejection fraction can be measured through a variety of imaging techniques, including echocardiograms, cardiac MRIs, and gated myocardial perfusion imaging.
