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Following 90 minutes of renal ischemia, gravity-drained venous blood is reduced in quantity, dilution by extravascular fluid is lessened and fluid is retained in the kidney. Venous potassium content is elevated to 14 to 20 mEq. per liter and reflects interstitial concentrations. Volume alterations may represent initiation of an immediate edematous response to this form of injury. Potassium concentrations of the observed range are sufficient to induce smooth muscle contraction and may play a role in post-ischemia malperfusion.
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Accepted: January 29, 1974
☆This work was supported in part by the John A. Hartford Foundation, Inc.
© 1974 Published by Elsevier Inc.