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Key principles and actions in first aid include:

1. Assess the Situation (DRSABCD):
   • Danger: Ensure the scene is safe for yourself and the casualty.
   • Response: Check if the person is conscious and responsive.
   • Send for help: Call emergency services (e.g., 911, 999, 112).
   • Airway: Check if the airway is clear and open.
   • Breathing: Check for normal breathing.
   • CPR: If not breathing normally, begin cardiopulmonary resuscitation.
   • Defibrillation: Use an automated external defibrillator (AED) if available and indicated.
2. Control Bleeding: Apply direct pressure to wounds, elevate the injured part, and use bandages.
3. Manage Shock: Lay the person down, elevate their legs (if no head/spinal injury), keep them warm, and reassure them.
4. Treat Burns: Cool the burn with cool (not ice cold) running water for at least 10-20 minutes, then cover loosely with a sterile dressing.
5. Address Choking: For adults, perform abdominal thrusts (Heimlich maneuver).
6. Immobilize Fractures/Sprains: Support the injured limb and avoid unnecessary movement.
7. Stay Calm and Reassure: Your calm demeanor can help the casualty.

A basic first aid kit should include items like sterile dressings, bandages, antiseptic wipes, medical tape, gloves, scissors, and a first aid manual.