Fig. 1

Potassium level after CPB weaning. T1, after administration of protamine; T2, ICU admission; T3, 1 h after ICU admission; T4, 3 h after ICU admission. The potassium level at T1 was 4.9±0.7 mEq/L, including two cases with levels exceeding 6 mEq/L. After ICU admission, the potassium level gradually decreased. Three hours after ICU admission, the potassium level was 3.7±0.3 mEq/L