· Long lasting anxiety or memories about a severe traumatic event, including nightmares, flashbacks, anxiety, avoidance of reminders
· Diagnostic criteria:
o Actual or threatened severely traumatic event where the response was intense fear, helplessness or horror
o Event is persistently re-experienced: recollections, dreams, distress to cues of an aspect of the event
o Persistent avoidance of stimuli associated with the trauma (triggers) and numbing of general responsiveness (eg ¯interest in activities, detachment, etc)
o Persistent symptoms of increased arousal (eg difficulty sleeping, irritability, ¯concentration, hypervigilance)
o Duration of > 1 month
o Causes significant distress or impairment in social/occupational function
· Types:
o Acute: duration of symptoms < 3 months
o Chronic: duration of symptoms > 3 months
o Delayed onset: onset > 6 months after stressor
· Differential: OCD, Acute stress disorder (resolves within 4 weeks), adjustment disorder, psychotic disorders, malingering
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