What is a common sign of an anaphylactic reaction?

Master the SNHD Advanced EMT Protocols. Test your knowledge with flashcards and multiple-choice questions. Each question comes with hints and explanations. Be ready for the AEMT test!

Swelling of the face, lips, or tongue is a hallmark sign of an anaphylactic reaction. In this severe allergic response, the body releases a flood of chemicals, including histamine, which causes blood vessels to dilate and increases permeability. This results in swelling, particularly in areas with loose tissue, such as the face and mouth. This swelling, known as angioedema, can constrict airways and make breathing difficult, which is a critical aspect of anaphylaxis that requires immediate medical attention.

While sweating and clammy skin, flushed appearance, and elevated heart rate can accompany anaphylaxis due to the body's stress response and changes in cardiovascular status, they are not as definitive as swelling in identifying this life-threatening reaction. Swelling specifically indicates the potentially dangerous airway compromise that can occur, underscoring the importance of recognizing this sign promptly.

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