28. A parent takes her child to the ER after the child had…
28. A parent takes her child to the ER after the child had an outbreak of hives on her chest. Upon examining the patient, the child was found to be restless and hyperventilating, had a decreased pulse, and was complaining about pain in her throat. After administering diphenhydramine (Benadryl), the patient’s symptoms improved significantly and VS returned to normal levels within 30 minutes. The parent asked “why was she suddenly allergic to what she had eaten many times before.? The nurse knows to explain which of the following?