Section 1 Etiology of IRI 1. Duration of ischemia 2. Dependency on O2 supply 3. The condition of reperfusion reperfusion pressure, speed, T, Na, Cal, K-t Mg2+Section 1 Etiology of IRI 1. Duration of ischemia 2. Dependency on O2 supply 3. The condition of reperfusion: reperfusion pressure, speed, T, Na+ , Ca2+, K+ , Mg2+