A new randomized controlled trial published in Nutrition, Metabolism & Cardiovascular Diseases has found that in those with heart failure, ejection fraction is improved by high-dose vitamin D supplementation.
Ejection fraction (EF) is a measurement of how much blood the heart pumps out with each beat. EF is usually measured as a percentage. With each heartbeat, the heart first contracts and the two pumping chambers, also called ventricles, pump out blood. The heart then relaxes and the ventricles fill with blood, again.
In otherwise healthy humans, the heart pumps out approximately half of the blood contained within it with each beat. Thus, a normal EF is considered in the range of 55% to 70%.
Heart failure is characterized by the inability of the heart to pump blood effectively to all areas throughout the body. EF is, therefore, an important measurement in recognizing and diagnosing heart failure. An EF of less 40% is considered evidence of heart failure.