() collateral#) circulation: chronic (3)02 consumption rate K]會Mg21會 protection electrolytes Nat]Ca食da amage (5)condition of t, pressure, pH, Nat, Cazt protection reperfusion ( T, pressure, Nat, C a2+1-,damage⑵ collateral(侧枝) circulation：chronic ⑶ O2 consumption rate [K+ ] , [Mg2+ ] protection ⑷ electrolytes [Na+ ] , [Ca2+ ] damage (5) condition of T, pressure,pH,Na+ ,Ca2+ protection reperfusion T, pressure,Na+ ,Ca2+ damage