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)
Also Known As:
Cerebral Concussion; Concussion, Brain; Commotio Cerebri; Concussion, Intermediate; Concussion, Mild; Concussion, Severe; Brain Concussions; Cerebral Concussions; Concussion, Cerebral; Intermediate Concussion; Intermediate Concussions; Mild Concussion; Mild Concussions; Severe Concussion; Severe Concussions