Studies On Post-Concussive Symptoms

A study in Norway (Siqurdardottir, S. 2009) studied post concussive symptoms from 3 to 12 months post injury in adults with TBI. Of the whole sample, 28% of cases developed those concussive syndromes at 3 months and 24% at 12 months post injury. The mild and moderate group showed a decline of symptoms over time in contrast to the severe TBI group. Greater levels of anxiety at 3 months, as well as shortness of post traumatic amnesia duration were found to be important predictors of the severity of these symptoms at 12 months. Interestingly, one year after injury, no differences were found between the TBI groups mild, moderate and severe on the presence of post concussive syndrome (PCS).

The second Norwegian study (Roe, C. et al. 2009) found that post concussive syndrome cognitive difficulties persisted for 12 months in a large percentage of the patients and that the cognitive symptoms persisted and were considered a significant problem even one-year after injury.