Total exchangeable potassium was measured in a group of dogs undergoing cardiopulmonary bypass with the radionuclide technique (42K). No alteration of total body content occurred after perfusion. This study supports the finding that a decrease of total exchangeable potassium does not occur solely as a result of extracorporeal circulation.
Kirsh MM, Moores WY, Morales J, Kahn DR, Gago O, Dufek JH, Sloan H. Effect of Extracorporeal Circulation on Total Body Potassium. Arch Surg. 1970;101(4):500-502. doi:10.1001/archsurg.1970.01340280052013