I. Hypokalemia concept: serum potassium <3.5mmol/L 1. cause and pathogenesis ① intake I fast alkalosis injection of insulin 2 move into Barium poisoning cels hypokalemic periodic yI pe paralysisI. Hypokalemia concept: serum potassium＜3.5mmol/L 1. cause and pathogenesis ① intake fast alkalosis injection of insulin ② move into Barium poisoning cells hypokalemic periodic paralysis