Ejection Fraction Calculator

Ejection Fraction Calculator

Created by Team y2calculate

Content written by Sajid Khan (MBBS, FCPS,)

Coding and design by Marcelino (Ms computer science)

Reviewed by Olivia Moore (Radiologist)

Fact checked 🔍✓

Published: November 11, 2023 → Last Updated: February 3, 2024

what is Stroke volume and end-diastolic volume ?

Stroke Volume (SV): Stroke Volume refers to the amount of blood ejected from the left ventricle of the heart during each contraction (systole). It is a crucial parameter in understanding the heart’s pumping efficiency. Mathematically, stroke volume is represented as the difference between the End Diastolic Volume (EDV) and the End Systolic Volume (ESV):

In this equation:

  • is the End Diastolic Volume, representing the volume of blood in the left ventricle at the end of the relaxation phase (diastole) just before the next contraction.
  • is the End Systolic Volume, representing the volume of blood in the left ventricle at the end of the contraction phase (systole).

Stroke Volume is a critical factor in determining the amount of blood the heart pumps with each beat, and it contributes to the calculation of parameters like the Ejection Fraction, which assesses the heart’s pumping function.

End-Diastolic Volume (EDV): End-Diastolic Volume is the volume of blood in the left ventricle at the end of the relaxation phase, known as diastole. It occurs just before the ventricle contracts and ejects blood into the aorta. EDV represents the maximum amount of blood that the left ventricle can hold before contraction.

A key point to note is that End-Diastolic Volume is one of the components used to calculate Stroke Volume and Ejection Fraction. It provides a baseline measure of the amount of blood in the heart just before it contracts, and the difference between EDV and End Systolic Volume (ESV) (the volume of blood left in the ventricle after contraction) gives the Stroke Volume.

These two parameters, Stroke Volume and End-Diastolic Volume, are fundamental in understanding the mechanics of the heart’s pumping action and are often assessed through imaging studies like echocardiography or other cardiac imaging techniques.

About Ejection fraction calculator

  1. Inputs:

    • The calculator takes two inputs from the user:
      • Stroke Volume (SV): This is the volume of blood pumped out of the heart during each contraction.
      • End Diastolic Volume (EDV): This is the volume of blood in the heart at the end of the relaxation phase (diastole) just before the next contraction.
  2. Formula:

    • The Ejection Fraction (EF) is calculated using the formula:
    • EF (%) = SV / EDV x 100 
    • where SV is Stroke Volume and EDV is End Diastolic Volume (EDV)
  3. Calculation:

    • The calculator performs the following steps:
      • It retrieves the user-inputted values for Stroke Volume (SV) and End Diastolic Volume (EDV).
      • It checks if the inputs are valid numeric values.
      • If the inputs are valid, it applies the formula to calculate the Ejection Fraction (EF).
      • The result is then displayed on the webpage.
  4. Result:

    • The calculated Ejection Fraction is presented as a percentage (%).
    • The result indicates the proportion of blood ejected from the heart with each contraction, providing insights into cardiac function.
  5. Interpretation:

    • Ejection Fraction values are often used to assess heart function:
      • A normal EF typically falls within the range of 50-70%.
      • Reduced EF values may indicate heart dysfunction, such as heart failure.
  6. Error Handling:

    • The calculator includes error handling to ensure that the user enters valid numeric values. If non-numeric values are entered, the calculator prompts the user to provide valid inputs.

In summary, this Ejection Fraction calculator enables users to assess the efficiency of their heart’s pumping function by inputting Stroke Volume (SV) and End Diastolic Volume (EDV), and it uses a simple formula to calculate the Ejection Fraction, which is then displayed as a percentage on the webpage.

what is ejection fraction ?

Ejection Fraction (EF) is a measurement used in cardiology to assess the efficiency of the heart’s pumping function. It represents the percentage of blood pumped out of the heart’s left ventricle with each contraction, which is a key indicator of cardiac performance. Ejection Fraction is expressed as a percentage.

The left ventricle is the chamber of the heart responsible for pumping oxygenated blood to the rest of the body. During each heartbeat, blood is ejected from the left ventricle into the aorta, which then distributes it throughout the circulatory system.

Ejection fraction Categories

Ejection Fraction (EF) is commonly categorized into different ranges to assess the overall pumping function of the heart. These categories help healthcare professionals and researchers evaluate the severity of cardiac dysfunction. Here are the general categories based on EF:

  1. Normal Ejection Fraction:

    • A normal EF typically falls within the range of 50-70%. This indicates that the heart is effectively pumping blood, and the overall cardiac function is considered normal.
  2. Mildly Reduced Ejection Fraction:

    • An EF between 41% and 49% may be classified as mildly reduced. While it suggests a slight decrease in pumping efficiency, it might not cause significant symptoms or impair overall heart function.
  3. Moderately Reduced Ejection Fraction:

    • An EF between 30% and 40% is categorized as moderately reduced. At this stage, there is a more noticeable decrease in pumping function, and individuals may experience symptoms such as fatigue, shortness of breath, or exercise intolerance.
  4. Severely Reduced Ejection Fraction:

    • An EF below 30% is considered severely reduced. This indicates a significant impairment in the heart’s ability to pump blood, and individuals are likely to experience more pronounced symptoms of heart failure.
  5. Preserved Ejection Fraction (Heart Failure with Preserved EF):

    • In some cases, heart failure can occur with a preserved EF, where the EF is above 50%. This condition is often associated with stiffness in the heart muscle, making it difficult for the ventricle to relax and fill properly.

When and how to check Ejection fraction

Ejection Fraction (EF) is typically assessed through imaging studies that allow healthcare professionals to visualize the heart’s structure and function. The two primary methods for measuring EF are echocardiography and radionuclide ventriculography. The choice between these methods depends on factors such as availability, patient characteristics, and the clinical scenario.

1. Echocardiography:

  • When: Echocardiography is commonly used to assess EF in various clinical settings.
  • How: This non-invasive imaging technique uses ultrasound waves to create detailed images of the heart. Specifically, a type of echocardiogram called a “Doppler echocardiogram” can be used to measure the volume of blood pumped out of the heart during each contraction (stroke volume) and calculate EF.

2. Radionuclide Ventriculography (Nuclear Medicine):

  • When: This method is often used when more detailed information about blood flow is needed or when echocardiography is inconclusive.
  • How: A small amount of radioactive material is injected into the bloodstream, and a special camera captures images as the material circulates through the heart. The images obtained help calculate EF.

3. Magnetic Resonance Imaging (MRI):

  • When: Cardiac MRI is another imaging modality that can be used to assess EF.
  • How: It provides highly detailed images of the heart, allowing for accurate measurement of volumes and calculation of EF.

4. Computed Tomography (CT):

  • When: Cardiac CT can also be used for EF assessment, especially in certain clinical scenarios.
  • How: It uses X-rays to create cross-sectional images of the heart, and specialized software can be used to measure volumes and calculate EF.

5. Invasive Techniques (Catheterization):

  • When: In certain cases, especially when planning interventional procedures, cardiac catheterization may be used to measure EF.
  • How: A catheter is threaded through blood vessels into the heart, and contrast material is injected to visualize the heart’s chambers. EF can be calculated based on the contrast movement.

When to Check Ejection Fraction:

  • EF assessment is often done in the following situations:
    • Diagnosis of Heart Conditions: To assess cardiac function in conditions such as heart failure, myocardial infarction, or cardiomyopathy.
    • Monitoring Treatment: To evaluate the effectiveness of treatment for heart conditions.
    • Preoperative Evaluation: Before certain cardiac surgeries or procedures.

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