Small bronchi smooth muscle contracture

Small bronchial smooth muscle contracture is one of the main pathological changes of type Ⅰ hypersensitivity disease. Diseases associated with type I hypersensitivity include atopic diseases [allergic rhinitis, allergic conjunctivitis, atopic dermatitis, and allergic asthma (exogenous and some urticaria, gastrointestinal food reactions, and systemic Allergic reactions.

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