The Relationship between Optimization for Cardiac Resynchronization Therapy by Measurement of dp/dt and the Middle-to-long-term Prognosis of Heart Failure Patients oleh Tomoyuki Kabutoya, MD, Takeshi Mitsuhashi, MD, Tomonori Watanabe, MD, Rieko Nakagami, MD, Yoshihito Hata, MD, Kazuyuki Shimada, MD, Kazuomi Kario, MD