Just like after the artery is compressed for a period of time, the hypoxic limb part will have a strong sense of paralysis, which can't be controlled freely for a period of time. After the blood transfusion is restored, it will return to normal with the help of external force. The situation of the brain is more complicated than this, where neurons are most concentrated. If you want to restore order there, you can only try all methods. Because external stimuli will produce stress currents, what changes can these currents bring to the whole system on the premise of ensuring oxygen transmission?