《英文msh词典》Cerebral Concussions
[入口词] Cerebral Concussions
[主题词] Brain Concussion
[英文释义] A nonspecific term used to describe transient alterations or loss of consciousness following closed head injuries. The duration of UNCONSCIOUSNESS generally lasts a few seconds,but may persist for several hours. Concussions may be classified as mild,intermediate,and severe. Prolonged periods of unconsciousness (often defined as greater than 6 hours in duration) may be referred to as post-traumatic coma (COMA,POST-HEAD INJURY). (From Rowland,Merritt's Textbook of Neurology,9th ed,p418)