West Coast EMT Block One Exam

Cupping and swelling following chemical exposure are typically associated with blister agents, also known as vesicants. These agents are designed to cause painful blisters and damage to the skin and mucous membranes upon exposure. When blister agents come into contact with the body, they disrupt cellular function and lead to localized inflammation, which manifests as swelling and sometimes painful blistering due to the accumulation of fluid beneath the skin. Blister agents, such as mustard gas or lewisite, have specific chemical properties that enable them to penetrate the skin and tissues, leading to these characteristic effects. The histamine release and vascular permeability changes induced by such agents result in the "cupping" effect as the tissues around the affected area become engorged with fluid. In contrast, choking agents primarily cause respiratory distress and damage to lung tissues, neurotoxins affect the nervous system, and asphyxiants hinder the body's ability to absorb or transport oxygen, none of which typically manifest with cupping or swelling in the manner associated with blister agents.