Write a concise but complete, viva-ready note on polytrauma management for EDIC Part 2. Base it on the latest ATLS guidance, current UK/NICE guidance and relevant European trauma guidelines. State clearly which guideline or approach is most suitable for the EDIC Part 2 viva. Start with the structured primary survey and simultaneous resuscitation, followed by the secondary survey. Include thoracic trauma, traumatic brain injury, spinal trauma and spinal cord injury. Include abdominal solid-organ and hollow-viscus trauma, pelvic trauma and major limb trauma. Cover both blunt trauma and penetrating/sharp trauma, highlighting important differences in management. Include essential investigations, imaging, immediate interventions, definitive treatment, drug doses, targets and time limits. Cover damage-control resuscitation, haemorrhage control, tranexamic acid, massive transfusion and trauma coagulopathy. After each recommendation, state the source and exact evidence grade in brackets; never invent a grade, and keep it accurate, current and easy to revise for the EDIC viva.