Radial plot of c-statistics, or area under the receiver operating characteristic curve, for standard echocardiographic variables in predicting HF hospitalization. Further distance from the center of the plot indicates higher predictive ability. LVEF, Left ventricular ejection fraction (%); LV ESV, left ventricular end-systolic volume (mL); EDV, end-diastolic volume (mL); LAV, left atrial volume (mL); RAV, right atrial volume (mL); EDPRv, end-diastolic pulmonary regurgitation velocity (m/s); TRv, TR velocity (m/s); MRv, mitral regurgitation velocity (m/s); PV s/d VTI, pulmonary vein systolic to diastolic flow ratio by velocity time integral (dimensionless ratio); IVRT, isovolumic relaxation time (ms).