Dear Sir, The recent Guidelines of heart failure (HF) of the European Society of Cardiology (ESC) propose an emerging classification of HF according to left ventricular ejection fraction (LVEF). Namely, patients with LVEF between 40 and 50% are classified in an intermediate group termed HF with mid-range ejection fraction (HFmrEF). Although the authors acknowledge that this subtle distinction may account for important differences in underlying aetiologies, demographics, co-morbidities and response to therapies, the group, as a whole, is suggested as a mild systolic dysfunction with features of diastolic dysfunction (sic).