Figure 1.

Features were pre-selected with 10-fold cross-validation with 500 trees. The features shown were represented in the top 20 in at least 6 of 10 folds and included in the final predictive dataset. Abbreviations: AVR: aortic valve replacement, LVEDV: left ventricular end-diastolic volume, LVESV: left ventricular end-systolic volume, BSA: body surface area, LVEF: left ventricular ejection fraction, BMI: body mass index, DBP; diastolic blood pressure, AR: aortic regurgitation, e′: mitral annulus early diastolic tissue Doppler velocity, E/e′: ratio of mitral early diastolic inflow and tissue Doppler velocity representing filling pressures, RVSP: right ventricular systolic pressure, CHF: congestive heart failure.