Additional Study Information: This study is for patients that have developed acute right ventricular failure or decompensation following LVAD implantation, post myocardial infarction, post heart transplant or post open heart surgery. The primary purpose for this study is to assess safety, feasibility and possible effectiveness of the use of the Impella RP System device in patients with right heart failure when medical treatments will not help. Impella RP System is a new, minimally invasive pump that is similar to a tiny propeller that is sealed inside a protective shell. This small pump is placed into the right pumping chamber of the heart and assists your heart to circulate blood throughout your body.