These observers are instructed to return patients to the hospital if any of the following develop: Decreased level of consciousness Focal neurologic deficits Worsening headache Vomiting Deterioration of mental function (eg, seems confused, cannot recognize people, behaves abnormally) Seizures Patients who had lost consciousness or have any abnormalities in mental or neurologic function and cannot be observed closely after discharge are generally observed in the emergency department or overnight in the hospital, and follow-up CT may be done in 8 to 12 hours if symptoms persist.