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Different classification systems for HF.
*It is referred to as a grey zone as the protocol and treatment for this group is not clear.
$ New York Heart Association classification.
HF = heart failure; LVEF = left ventricular ejection fraction; HFrEF = heart failure with reduced ejection fraction; HFmrEF = heart failure with mid-range ejection fraction; HFpEF = heart failure with preserved ejection fraction
