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Concussion grading systems are sets of criteria used in sports medicine to determine the severity, or grade, of a concussion, the mildest form of traumatic brain injury. At least 16 such systems exist, [ 1 ] and there is little agreement among professionals about which is the best to use. [ 2 ]
The Concussion Index algorithm is FDA cleared for use on patients 13–25 years of age with a GSC score of 15 and can be used with 72 hours of acute injury, for baseline and throughout recovery. BrainScope was originally cleared by the FDA as the Ahead 300 under 510(k) K161068 in September 2016. [ 7 ]
Concussion, a type of mild traumatic brain injury that is caused by a direct or indirect hit to the head, body, or face is a common injury associated with sports and can affect people of all ages. A concussion is defined as a "complex pathophysiological process affecting the brain, induced by biomechanical forces". [1]
For a context-free grammar in Greibach normal form, defining (1,γ) ∈ δ(1,a,A) for each grammar rule A → aγ also yields an equivalent nondeterministic pushdown automaton. [4] The converse, finding a grammar for a given PDA, is not that easy. The trick is to code two states of the PDA into the nonterminals of the grammar. Theorem.
Post-concussion syndrome is believed to be able to arise for reasons aside from sustaining a (mild) traumatic brain injury. In one study, health professionals cited organic causes in general as being most responsible for the development of PCS; however, emotional and compensatory causes have also been implicated as factors. [ 13 ]
Immunoreactive axonal profiles are observed as either granular (B, G, H) or more elongated, fusiform (F) swellings in the corpus callosum and the brain stem (H) at 24h post traumatic brain injury. Example of APP immunoreactive neurons (arrow heads) observed in the cortex underneath the impact site (E, G).
All cases of a concussion result in mandatory restricted duty for 24 hours followed by immediate reevaluation via the MACE. Similarly, the MACE is most effective if given within 24 hours of the injury event to fully gauge the level of possible brain injury. [2] The MACE has been distributed to all branches of the US military.
A rapid trauma assessment goes from head to toe to find these life threats: [1] [3] [5] Cervical spinal injury; Level of consciousness; Skull fractures, crepitus, and signs of brain injury; Airway problems (although these were checked during the initial assessment, they are rechecked during the rapid trauma assessment) such as tracheal deviation