"Two amps sodium bicarb" used to be a standard order for cardiac arrest patients to correct acidosis, but then they learned that the acidosis was caused by retained CO2 from a lack of respiration. Once the patient's airway is re-established and he is properly ventilated, the acidosis generally is corrected and bicarb is not necessary and may indeed be harmful. Bicarb is still used in cases of metabolic acidosis however.