The ejection fraction (EF) is the measure of how much blood pumped out of the heart with each of its contractions. According to the Heart Rhythm Society, low ejection fraction can be improved by cutting down salt intake, managing fluid intake and engaging in regular exercise.
The Heart Rhythm Society explains that EF is measured using an echo-cardiogram, which is a device that creates a video image of the heart as it works by using sound waves.
According to the Heart Rhythm Society, normal EF is between 50 and 75 percent of the heart’s volume each time it beats. Low EF is considered to be an early warning sign of heart failure; it presents with symptoms such as extremely rapid heartbeat, swelling around the feet, extreme tiredness and shortness of breath.