It is important for the occupational health nurse to be aware of and understand the mechanism of injury and forces involved in a trauma event. This understanding provides insight into the potential injuries that may be present even if the victim appears unhurt. 2. The primary survey is designed to rapidly determine life threatening problems and provide immediate interventions. 3. The secondary survey is a more detailed, head to toe assessment of the victim to determine if other injuries are present. This part of the examination helps determine more subtle findings.