There is no way to save brain death. Brain dead patients do not breathe on their own and must rely on ventilator-assisted ventilation, and if ventilator-assisted ventilation is stopped, the patient will die immediately. If ventilator-assisted ventilation is maintained, some patients can maintain their heart rate and basal metabolism for a very long time. Brain death suggests a total loss of brain function, resulting from a severe brain injury, or a serious physical illness secondary to brain injury. After brain death, the patient does not respond to all external stimuli and has no voluntary activity. The spinal reflexes may still exist, but the light reflexes and vestibular reflexes, which are brainstem reflexes, are all gone, the pupils are dilated, there is no voluntary breathing, the EEG reveals the disappearance of brain waves, there is no cerebral blood perfusion on transcranial Doppler ultrasonography, and the somatosensory evoked potentials indicate total loss of brainstem function. These conditions were maintained for at least 12 hours and were not reversed by resuscitation before brain death could be diagnosed, so there is no way to reverse brain death in patients.