I think the answer is Electrolytes.
Explained .Many comatose patients stay in the hospital's intensive care unit (ICU), where doctors and nurses can continually monitor them .Because patients who are in a coma can't eat or drink on their own, they receive nutrients and liquids through a vein or feeding tube so that they don't starve or dehydrate. Coma patients may also receive electrolytes -- salt and other substances that help regulate body processes
