What causes poor ejection fracture numbers? Can it be successfully treated &/or cured, or will numbers decrease until person dies? How long life avg.?

Heart failure. Normal ejection fraction of the heart is considered >55%. Heart disease, of which coronary artery disease, hypertension, and valvular disease and less frequently myocarditis and cardiomyopathies are considered the major causes of heart failure that may result in poor ejection fraction. Whether it is restorable or not depends on the nature and severity of the disease and its reversibility.