What term describes a direct venom effect presenting with GI disturbances and bronchospasm?

What term describes a direct venom effect presenting with GI disturbances and bronchospasm?

• A. Anaphylactic reaction
• B. Toxic reaction
• C. Allergic reaction
• D. Neurotoxic reaction

Answer: (B)

The key idea is distinguishing direct venom effects from immune-mediated reactions. A toxic reaction refers to the direct pharmacologic effects of venom on tissues. So GI disturbances and bronchospasm can arise from the toxin acting directly on gastrointestinal smooth muscle and bronchial smooth muscle, without involving an immune sensitization process. This is different from anaphylactic or allergic reactions, which are immune-mediated hypersensitivity and typically involve widespread mediator release with additional signs like urticaria or hypotension. Neurotoxic reactions describe paralysis from neurotoxins, not the GI symptoms and bronchospasm described here. Therefore, the direct, non-immune venom effect producing those symptoms is best described as a toxic reaction.

The key idea is distinguishing direct venom effects from immune-mediated reactions. A toxic reaction refers to the direct pharmacologic effects of venom on tissues. So GI disturbances and bronchospasm can arise from the toxin acting directly on gastrointestinal smooth muscle and bronchial smooth muscle, without involving an immune sensitization process. This is different from anaphylactic or allergic reactions, which are immune-mediated hypersensitivity and typically involve widespread mediator release with additional signs like urticaria or hypotension. Neurotoxic reactions describe paralysis from neurotoxins, not the GI symptoms and bronchospasm described here. Therefore, the direct, non-immune venom effect producing those symptoms is best described as a toxic reaction.