Predictors of abnormal response of the HRR in the study population.

Data are expressed as mean value ± SD or number (percentage) of patients. LVEF = left ventricular ejection fraction; RBBB = right bundle branch block; E = early diastolic transmitral flow velocity; A = late transmitral flow velocity; DT = deceleration time; ms = milliseconds; E/e' = ratio of the early diastolic transmitral flow velocity to early diastolic mitral annular velocity; HR = heart rate; VO2 = oxygen uptake; VPB = ventricular premature beats. *defined as more than 7 ventricular premature beats per minute [30].