Brain Concussion

**Definition:** 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)

**Tree numbers:** - C10.228.140.199.444.250 - C10.900.300.087.235.250 - C10.900.300.350.300 - C26.915.300.200.194.250 - C26.915.300.450.500 - C26.974.382.200

**Synonyms:** - Cerebral Concussion - Commotio Cerebri