569 Preliminary Study: Increased Levels of cGMP in Recipients of Continuous Flow LVADs, Implications for Gastrointestinal Bleeding - Grosman-Rimon, L.; Cherney, D.Z.I.; Bar-Ziv, S. Pollock; McDonald, M.A.; Tumiati, L.; Rao, V. (Journal of Heart & Lung Transplantation, 2012)