Final answer:
The initial diagnosis for Elizabeth is anaphylaxis, a severe allergic reaction. It is characterized by redness, swelling, hives, difficulty talking, wheezing, tachycardia, hypotension, and potential swelling of the throat. The immediate treatment is epinephrine.
Step-by-step explanation:
The initial diagnosis for Elizabeth, based on her symptoms, is anaphylaxis. Anaphylaxis is a severe allergic reaction that can be life-threatening. It is characterized by a release of histamines, causing symptoms such as redness and swelling at the site of the sting, hives, difficulty talking due to swelling of the tongue, wheezing, feeling faint and lightheaded, tachycardia (rapid heart rate), hypotension (low blood pressure), and potentially swelling of the throat and airways, which can lead to suffocation.
Anaphylaxis is commonly triggered by insect stings, foods, medications, or other allergens. The body's immune system overreacts to these triggers and releases a large amount of histamines, causing the symptoms. The immediate treatment for anaphylaxis is the administration of epinephrine, which helps control the allergic response and can be life-saving.