Tankless water heaters save money in the long run, but initial costs are higher than tank models. Endless hot water, additional storage space and lower energy bills are just a few reasons homeowners are switching to tankless water heaters.
Ejection Fraction Heart Failure Measurement. The ejection fraction (EF) is an important measurement in determining how well your heart is pumping out blood and in diagnosing and tracking heart failure. A significant proportion of patients with heart failure happen to have a normal ventricular ejection fraction at echocardiography during examination.
Typically, the left ventricle ejects 55% or more of its blood volume with each beat, so a normal ejection fraction is 55% (0.55) or higher. 1  An ejection fraction of 40 - 50% is considered âbelow normal.â Patients with heart failure most often have ejection fractions that are less than 40%. It is important to note that when doctors say the words âejection fractionâ they are referring to the ejection fraction of the left ventricle.