Calcium Gluconate is not used in CPR in which condition :

Calcium gluconate should be used as a first-line agent in patients with EKG changes or severe hyperkalemia to protect cardiomyocytes. Insulin and glucose combination is the fastest acting drug that shifts potassium into the cells. Hemodialysis is the most effective and reliable method to remove potassium from the body Electrocardiogram : Hypokalemia leads to characteristic ECG changes (QRS prolongation, ST-segment and T-wave depression, U-wave formation). The earliest electrocardiographic (ECG) findings, associated with hypokalemia, are decreased T wave heigh. Then, ST depressions and T inversions appear as serum potassium levels reduce fuher. Due to prolonged repolarization of ventricular Purkinje fibers, prominent U waves occur (usually seen at V2 and V3 leads), frequently superimposed upon T waves, therefore producing the appearance of prolonged QT intervals, when serum potassium levels fall below 3 mEq/. during hypokalemia calcium gluconate is not used in CPR Ref Harrison 20th edition pg 1445