Definition:  Concussion symptoms that continue beyond the expected 7-10d recovery period 
Patients with more severe symptoms on initial presentation may be more at risk
History of migraine, depression, anxiety also a possible risk factor
Patients with more severe symptoms on initial presentation may be more at risk
History of migraine, depression, anxiety also a possible risk factor
Post-concussive syndrome
Traumatic brain injury
Mild traumatic brain injury
Intracranial hemorrhage
Brain herniation syndromes
Moderate-to-severe traumatic brain injury
Cardiac contusion
Elevated intracranial pressure