Initial physiological responses and perceived hyperarousal predict subsequent emotional numbing in pediatric injury patients.

The present study tested the hypothesis that acute posttraumatic hyperarousal would lead to the development of emotional numbing (EN) symptoms in a pediatric injury population. Eighty-two youths aged 8-18 years were recruited from the emergency department of a Midwestern children's hospital. Heart rate was recorded from emergency medical services reports and a 12-hour urine collection was initiated upon admission. Six weeks and 6 months later, depression and PTSD symptoms were assessed. Initial heart rate and urinary cortisol levels predicted 6-week and 6-month EN after controlling for concurrent depression, avoidance, and reexperiencing symptoms and 6-week hyperarousal symptoms. These findings provide empirical support for prior hypotheses concerning the development of PTSD symptoms over time.