Which immune system response is most likely to be activated in a patient who presents with profound cyanosis following a chest injury?

• A. Antibody-mediated hypersensitivity
• B. Autoimmune response
• C. Inflammatory response
• D. Allergic reaction

Answer: (C)

Verified step by step guidance

1. Step 1: Understand the context of the problem. Cyanosis is a condition characterized by a bluish discoloration of the skin due to insufficient oxygen in the blood. A chest injury can lead to tissue damage, which triggers the body's immune system to respond.
2. Step 2: Review the immune system responses listed in the problem. These include antibody-mediated hypersensitivity, autoimmune response, inflammatory response, and allergic reaction. Each has distinct mechanisms and triggers.
3. Step 3: Focus on the inflammatory response. This is the body's immediate reaction to injury or infection, involving the release of chemical mediators like histamine and cytokines. These mediators increase blood flow, recruit immune cells, and promote healing in the affected area.
4. Step 4: Eliminate other options. Antibody-mediated hypersensitivity typically involves an exaggerated immune response to antigens, such as in allergies or autoimmune diseases. Autoimmune responses occur when the immune system attacks the body's own tissues. Allergic reactions are triggered by allergens, not physical trauma.
5. Step 5: Conclude that the inflammatory response is the most likely immune system activation in this scenario, as it directly addresses tissue damage and promotes repair following the chest injury.