1. The primary objective of this study is to evaluate the effect on IVIG on LV remodeling and function: LV remodeling will be evaluated with magnetic resonance imaging (MRI) which offers an unsurpassed precision in the measurements of heart volumes and function. End points will be LV-end systolic and diastolic volume (LVESV, LVEDV), regional wall motion score index (WMSI), and LV-ejection fraction (LV-EF).