The primary assessment reveals that the patient is anxious

The primary assessment reveals that the patient is anxious. His airway is clear, and he can speak in full sentences. The patient has a respiratory rate of 28/minute with normal chest rise and fall. The peripheral pulses are present, and his heart rate is 116 beats per minute. The skin is warm and flushed, and you note reddened hives on the body. The SpO 2 reading is 96 percent on room air.

a. What is the underlying pathology of this patient?

b. What immediate emergency care should you provide based on the initial assessment?