Extension of the ischemic time of reversible myocardial cellular injury by pharmacological agents with cold cardioplegia in clinical experience: H.Tanaka, M.Sunamori, T.Okamura, J.Amano, T.Nakagawa, H.Arai, T.Maruyama, T.Sakamoto, A.Suzuki. Dept. of Thoracic-Cardiovascular Surg, Tokyo Medical and Dental University, Tokyo, Japan