What is an ejection fraction?

The ejector fraction is a measurement that says what percentage of blood is drawn from the chamber in the heart with each rhythm. It is usually measured from the left ventricle, which is the main pumping chamber in the heart. Sometimes it is qualified as an ejection fraction of the right ventricular (rvef) to refer to the amount of blood supplied to the lungs.

During the heart rhythm, the heart muscle contrasts and relaxes just like any other muscle during activity. Relaxation allows the filling of chambers or chambers with blood. The contractions force blood back. The strength of the heart and the clarity of the arteries determines how much blood will be pushed and circulated throughout the body. The volume left in the chamber after contraction is the end systolic volume. If you deduct the end systolic from the end diastolic volume, it produces a number called bundle. In fact, this is the percentage of end-diastolic volume, which was forced by every rhythm.

For an average healthy person weighing approximately £ 154 (70 kg), the volume of a stroke should be approximately 2.4 oz (70 ml) and the end diastolic volume should be around 4.1 oz (120 ml). This makes the 2.4/4.1 or 70/120 ejection fraction, which is about 58%. The normal ejection fraction of the left ventricular (LVEF) ranges from 50 to 70%, but can be reduced by heart damage or other heart problems.

Cardiologists use the ejection fraction to determine the prognosis in patients suffering from a number of diseases, not least, angina or chest pain. The following figures are approximately ranges for LVEF and their indications: 50-70% is normal, 36-49% is below normal, 35-40% can indicate systolic heart Failure and below 35% is considered life-threatening and irregular. If the ejection fraction is found to be in this lowest category, immediate measures are taken to prevent full heart failure.

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ejection fraction is measured by various imaging techniques. Ultrasound, also onThe sound echocardiogram uses sound waves to produce heart images. Cardiac catheterization includes a thin tube placed in a vein in the leg and heart, while magnetic resonance (MRI) uses magnetic fields and radio waves to form cross -sections. The cardiac calculated tomography (CT) is a more involved version of the X -ray and multiple scanning Acquisition (MUGA), using a small amount of radioactive material in the bloodstream combined with special cameras to create a pumping blood visualization.