Final answer:
During the immediate postictal period after a tonic-clonic seizure, the correct action for a nurse is to place the child in a side-lying position to maintain an open airway and prevent aspiration.
Step-by-step explanation:
A nurse caring for a school-age child who has experienced a tonic-clonic seizure should engage in several postictal care procedures. It is essential to ensure the child's safety and monitor for any further medical needs. Among the options provided, the correct action to take during the immediate postictal period is to place the child in a side-lying position. This helps to maintain an open airway and allows any secretions or vomit to drain from the mouth, thus preventing aspiration. Moreover, while anticonvulsants such as diazepam may be required for managing seizures and reducing the risk of brain damage, they are usually administered to patients who are actively seizing or as part of ongoing management, rather than during the postictal phase. It is not recommended to restrain the child, as this can cause harm and does not aid in recovery. Offering a snack is inappropriate at this stage as the child's swallowing reflex may not be fully functioning immediately after a seizure.