Before and after changes in left ventricular function between Groups 1 and 2. **Compared with Group 1, P <0.01. Group 1: coronary microembolization with 120,000 microspheres. Group 2: coronary microembolization with 120,000 microspheres and pretreatment with methylprednisolone. (Δ LVEF = 6 h LVEF-baseline LVEF, ΔΔ LVEF = 1 week LVEF-baseline LVEF; Δ LVEDV = 6 h LVEDV-baseline LVEDV, ΔΔ LVEDV = 1 week LVEDV-baseline LVEDV; Δ LVESV = 6 h LVESV-baseline LVESV, ΔΔ LVESV = 1 week LVESV-baseline LVESV). LVEF: left ventricular ejection fraction; LVEDV: left ventricular end diastolic volume. LVESV: left ventricular end systolic volume. Before and after changes in LVEF at 6 h were significantly lower in Group 2 than in Group 1. At 1 week before and after changes in LVEDV and LVESV were significantly lower in Group 2 than in Group 1.