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(Na+ + K+)-ATPase Activity in the Liver with Hemorrhagic Shock 1

Summary (Na+ + K+)-ATPase activity was measured in the liver of rats subjected to an early stage of hemorrhagic shock (25% of shed blood taken back spontaneously) and a late stage (50-70% of shed blood taken back). In unbled control animals the activity was 10.6 ± 1.04 (mean ± SEM) nmoles H+/(mg protein X min). An approximately twofold increase in activity in early shock and a threefold increase in late shock was found. When animals were treated by return of the shed blood plus 5-6 ml of Ringer's lactate solution in the early and late stages of shock and allowed 1 hr for recovery, the (Na+ + K+)-ATPase activity decreased to near control levels. These results also indicate that the increased liver (Na+ + K+)-ATPase activity in shock is reversible with treatment.