Simply it’s a shock, psychological shock!
When person suddenly faces the traumatic event, in reaction of situation person may be affected by ASD. It was first illustrated by ‘Walter Canon’ in 1920s. The sudden stress response is association with specific psychological actions in the sympathetic nervous system. By definition, ASD is the result of any experienced traumatic event or witness of any extreme experience of the victim such as accident (death on spot or major injuries). It also included the thread of death to him/her or unexpected fear. ASD if prolong then leads to Post Traumatic Stress Disorder (PTSD).
The common symptoms are amnesia, depersonalize, detachment and hopelessness. Continuing re-experience of traumatic event in the form of flashbacks, nightmares and thoughts leads person to ASD. During this course of time they also experience at-least one functioning area impairment and anxiety. During of the symptoms may last for 2-days to maximum 4-weeks. And they must be occurring within the 4-weeks of the traumatic event. If the symptoms last for more than 1-month, then it will convert into PTSD.
The best treatment of ASD is time. It recovers as time passes. Person’s self-esteem plays very important role. Second important past is of family. Family members must not talk about the traumatic event and try to indulge him/her the activities which they like the most. Never leave person alone in home, try to make them happy as involve them in routine activities. Most of the time person with ASD tried to leave him/her alone but this will lead them to PTSD. They feel sad, hopeless, worthless and even not take part in the activities which they used to enjoy. Cognitive Behavior Therapy (CBT) also recommended. A combination of relaxation, counseling and cognitive restructuring will be the effective.