Loss of arousal

The awakening state of the coma patient is lost. The clinical manifestation is that the patient's awakening-sleep cycle disappears, and he is in a continuous "deep sleep" and cannot wake up. Many mental activities such as consciousness, attention, thinking, emotion, orientation, judgment, memory of the patient were all lost. He has no understanding of himself and the external environment, and has no response to external stimuli. It cannot be executed for simple commands. Gives intense painful stimuli, with the exception of sometimes painful expressions or moaning, completely unconscious reactions.