What is a non-pharmacological intervention used in cases of bradycardia?

Positioning the child appropriately is a non-pharmacological intervention used in cases of bradycardia. Proper positioning can help optimize the child’s hemodynamics by allowing for better venous return to the heart and can assist in maintaining adequate cardiac output. For example, placing the child in a supine position can promote blood flow and aid in the effectiveness of the heart's contractions, particularly in an emergency scenario.

While the other options may play roles in managing a child's overall condition, they are either pharmacological interventions or more aggressive measures not specifically categorized as non-pharmacological. Administering nitroglycerin is a medication option typically used for chest pain or hypertensive emergencies, not for bradycardia. Providing supplemental oxygen, although beneficial in respiratory distress scenarios, is not a direct intervention for treating bradycardia itself without an underlying respiratory issue. Performing immediate chest compressions is an important action in the case of cardiac arrest or severe bradycardia leading to poor perfusion, but it is an aggressive measure rather than a supportive, non-pharmacological intervention. Thus, positioning is the most appropriate choice in this context.