Sodium bicarbonate after cardiac arrest?

It used to be taught in versions of ACLS long past, the sodium bicarbonate should be administered as part of ACLS for the treatment of cardiac arrest. This is no longer the practice, but why? The principle academic answer is that there has not been any demonstrable improvement in outcomes. The practical explantation is that in an arrest situation, if an acidosis is present it is most likely from a respiratory cause--- respiratory acidosis. Therefore, the appropriate treatment would be to support the airway and provide mechanical ventilation.