Also known as: Hearth Failure With Reduced Ejection Fraction (HFrEF) / Heart Failure With Reduced Ejection Fraction / Reduced ejection fraction heart failure / Systolic Heart Failure / Heart Failure and Reduced Ejection Fraction / Heart Failure, Reduced Ejection Fraction / Heart Failure With Reduced Ejection Fraction (HF-rEF) / Heart Failure With Reduced Ejection Fraction, HFrEF / Heart Failure Systolic / Heart Failure, Systolic / Systolic (congestive) heart failure / Heart failure with reduced ejection fraction (disorder) / Unspecified systolic (congestive) heart failure / Systolic heart failure (disorder) / Left ventricular failure, unspecified / Left ventricular failure / Left ventricular failures / LVF / Left ventricular insufficiency / Failure heart left / Left heart failure / Heart Failure, Left-Sided / Left heart failure (disorder) / Cardiac failure left / Left cardiac failure / Failure left heart