What should you do if you must leave the casualty?

When caring for a casualty, if you must leave them unattended, it is crucial to position their head to the side. This action is essential to prevent choking in the event they become unconscious or if they vomit. By ensuring the head is turned to the side, any fluids that might enter the airway can drain away rather than cause aspiration, which is a serious medical risk. It prioritizes the casualty's safety and reduces the likelihood of complications while you are away.

Leaving the casualty in a prone position could lead to respiratory issues, especially if they lose consciousness. Awakening the casualty might not be feasible or appropriate if they are severely injured. Keeping them upright is not ideal either, as it could create additional strain on their body and complicate any potential medical needs. Hence, positioning the head to the side is the best practice in this situation to maintain the casualty's safety while you seek further assistance or help.