Final answer:
The nurse should call security when a family member's distress is escalating and safety is a concern, or inform the unit manager who oversees the unit's operation. An impartial family member can help in less urgent situations, while an EMT passing by would not be the appropriate choice.
Step-by-step explanation:
When a family member's distress is escalating in a healthcare setting, the nurse has multiple options for assistance. If the situation is escalating to a point where safety is a concern, calling security is often the most immediate and effective course of action. Security personnel are trained to handle such situations and can help to de-escalate tensions.
Additionally, the nurse may choose to inform the unit manager of the situation, as they are responsible for overseeing the unit's operation and handling conflicts. In less urgent circumstances, involving an impartial family member may help to calm the situation. However, calling an EMT passing in the hall would not be appropriate as they are typically not part of the hospital's response team for in-facility incidents and may be on their way to respond to an emergency elsewhere.