What symptom is NOT typically associated with immediate hypersensitivity reactions?

Immediate hypersensitivity reactions, often mediated by immunoglobulin E (IgE), typically manifest through a variety of symptoms due to the rapid release of histamines and other inflammatory mediators. Symptoms such as wheezing, urticaria, and diaphoresis are closely associated with these types of allergic reactions.

Wheezing occurs as a result of bronchoconstriction caused by the contraction of smooth muscles in the airways, leading to difficulty in breathing. Urticaria, commonly known as hives, results from localized swelling in the skin due to vasodilation and increased vascular permeability triggered by histamine release. Diaphoresis, which is excessive sweating, can also occur due to the autonomic nervous system's response to the stress of an allergic reaction.

Bradycardia, on the other hand, which refers to a slower than normal heart rate, is not a common symptom of immediate hypersensitivity reactions. In fact, allergic reactions often lead to tachycardia (increased heart rate) as the body attempts to cope with the stress response, mounting a defense against the allergen. Therefore, bradycardia stands out as the symptom that does not typically align with the presentation of immediate hypersensitivity reactions.