pH paradOX ischemia acidosis, disorder of function and metbolism on cell severe ri ph paradox calcium paradox pre-perfuse rat heart with no calcium perfusion for 2min perfuse calcium perfusion, cell release enzyme myofibril over-constract, electron signals abnormal,calcium paradoxpH paradox ischemia acidosis , disorder of function and metbolism on cell severe IRI pH paradox calcium paradox pre-perfuse rat heart with no calcium perfusion for 2min perfuse calcium perfusion, cell release enzyme myofibril over-constract, electron signals abnormal， calcium paradox