Final answer:
In response to a panic attack with symptoms such as difficulty breathing and chest pain, the nurse should first assess vital signs and then help the client with deep breathing techniques.
Step-by-step explanation:
During a panic attack, the nurse should first assess the client's physical state to rule out any immediate life-threatening conditions, such as a heart attack or asthma attack, which can present with similar symptoms. While breathing into a paper bag can be a remedy for hyperventilation, assisting the client to breathe deeply and slowly without the bag is generally preferred to ensure that they are not actually suffering from a condition that requires more immediate medical attention. Therefore, the nurse should first assess the client's vitals, including their pulse and oxygen saturation, and if the client is not in immediate danger, help them to use deep breathing techniques to manage their symptoms.