(2) collateral( u#)circulation: chronic (302 consumption rate K+1Mg21會 protection (4 electrolytes 1Nat]食Ca2食= damage (5)condition of f, pressure, pH, Na*, Ca2tprotection reperfusion (T, pressure, Na*, C a2+=, 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