What type of allergic reaction to contrast media is indicated by diaphoresis, hypotension, and bradycardia?

• A. Allergic reaction
• B. Vasovagal reaction
• C. Anaphylactic reaction
• D. Chronic reaction

Answer: (B)

The symptoms described—diaphoresis (sweating), hypotension (low blood pressure), and bradycardia (slow heart rate)—are characteristic of a vasovagal reaction. This type of reaction is usually triggered by stress, pain, or the sight of blood, leading to a sudden drop in heart rate and blood pressure, which can result in fainting or near-fainting episodes.

Vasovagal reactions are often associated with a feeling of warmth, nausea, and lightheadedness, and they typically resolve quickly once the individual is laid down and allowed to rest. In contrast, an anaphylactic reaction would present with more systemic symptoms such as hives, swelling, difficulty breathing, and potentially circulatory collapse, which are not specifically indicated in the original symptoms.

Understanding these differences is vital for accurate diagnosis and treatment in clinical settings.