Final answer:
A 55-year old woman with a severe allergic reaction to peanuts displaying signs of anaphylaxis should be immediately treated with epinephrine, closely monitored, and transported to a hospital for further care.
Step-by-step explanation:
You are attending to a 55-year old female who is experiencing an allergic reaction to peanuts. Given the symptoms, such as diffuse urticaria and the feeling of a lump in the throat, along with the patient's consciousness and alertness, this situation suggests the onset of anaphylaxis, which is a severe allergic reaction. The patient requires immediate medical attention, and the administration of epinephrine is crucial as it is the first-line treatment for anaphylactic reactions. It works by raising blood pressure and relaxing bronchial smooth muscles, helping to alleviate symptoms and prevent progression of the allergy to a more severe state.
Epinephrine should be administered as soon as possible, either by yourself if you are equipped and trained to do so, or by instructing the patient to use their own epinephrine autoinjector if they have one. Monitoring vital signs is essential following the administration of epinephrine, and preparing to provide additional supportive care, including cardiopulmonary resuscitation (CPR) if necessary, is also important. The patient should be transported to the hospital immediately for further treatment and observation to manage the reaction and prevent late-phase reactions, which might include the administration of antihistamines and corticosteroids.