The phenomenology of posttraumatic stress disorders following a natural disaster.

This study examined the utility of the DSM-III diagnostic criteria for posttraumatic stress disorder (PTSD) in a high-risk group of 50 firefighters who had had an intense exposure to a natural disaster 8 months before being interviewed. Follow-up over the next 3 years allowed examination of the ability of these diagnostic criteria to predict a pattern of chronic posttraumatic morbidity. They predicted a pattern of chronic disorder, demonstrated by the finding that eight of the 15 subjects who had definite or borderline PTSD at 8 months remained symptomatic 3 years later. A disturbance of attention and concentration appeared to be the best predictor of chronic PTSD. The longitudinal course of posttraumatic morbidity in these 50 firefighters was compared with a matched group of 96 uninterviewed subjects 11 and 29 months after the disaster. Although the interview provoked an emotional catharsis in a number of firefighters, the long-term morbidity in the two groups was comparable. Fourteen subjects who did not have PTSD continued to experience intense imagery 8 months after the disaster. This observation raises questions about whether such thoughts and feelings have adequate specificity as diagnostic criteria for PTSD in a group that has recently been exposed to a traumatic event.