Which of the following is a sign of a potential allergic reaction in an emergency patient?

Wheezing and swelling around the face are both classic signs of an allergic reaction, particularly in response to an allergen such as food, medications, or insect stings. Wheezing indicates that the airways may be constricting, which can lead to difficulty in breathing. Meanwhile, swelling around the face, commonly referred to as angioedema, can occur due to the release of histamines and other chemicals in the body during an allergic response. These symptoms combined suggest a potentially serious situation, such as anaphylaxis, which requires immediate medical attention.

The other options presented do not align with typical signs of an allergic reaction and are more indicative of other medical conditions. For instance, a sudden onset of high fever is usually associated with infections rather than allergies. An increased heart rate could occur for various reasons, including anxiety or cardiac conditions, but without accompanying symptoms, it is not specifically indicative of an allergic reaction. Persistent stomach pain can also arise from many issues unrelated to allergies, such as gastrointestinal disorders. Thus, the presence of wheezing and face swelling distinctly points towards a potential allergic reaction, making it the correct choice.