THE METABOLIC CHANGES OF POTASSTUM IN PLASMA AND RED CELLS DURING CARDIOPULMONARY BYPASS AND THE STUDY OF POTASSIUM REPLACEMENT / 西安交通大学学报(医学版)

ABSTRACT

The potassium content in serum, red cells andsome factors involved in hypopotassium were ob-served in 30 cases with open heart surgery. Ac-cording to the results, we conclude that (1) Hy-popotassium tendency before and during cardiopul-monary bypass was mainly produced by the potas-sium moving into the red cells from the serum. Af-ter Cardiopulmonary bypass it was mainly owing tothe excretion of potassium through the urine. (2)The potassium shifting into the red cells waschiefly affeced by the bypothermia, pH, and perfu-sion time. (3) The red cell potassium lost whenplasma potassium value set below 4. 0 m mol/L.1. 56 m mol/kg of potassium administered was atleaset reqired to maintain plasma potassium leverover 4. 0 m mol/L.