Which biochemical mediator is linked to pain in DCS due to endothelial activation?

Which biochemical mediator is linked to pain in DCS due to endothelial activation?

• A. Kinins released from endothelial cells
• B. Histamines only
• C. Interleukin-2 without involvement
• D. Dopamine pathways

Answer: (A)

In decompression sickness, gas bubbles injure or activate the endothelium, which triggers the kinin system. Kinins released from endothelial cells, especially bradykinin, directly sensitize and activate nociceptors, producing the characteristic pain and hyperalgesia. Bradykinin also promotes vasodilation and increased vascular permeability, which can amplify discomfort through edema. Other options aren’t the primary drivers here: histamine is more related to allergic-type reactions and not the main pain mediator in DCS; interleukin-2 is a cytokine involved in immune cell growth with little direct role in acute nociception; and dopamine pathways do not mediate this acute endothelial-pain response.

In decompression sickness, gas bubbles injure or activate the endothelium, which triggers the kinin system. Kinins released from endothelial cells, especially bradykinin, directly sensitize and activate nociceptors, producing the characteristic pain and hyperalgesia. Bradykinin also promotes vasodilation and increased vascular permeability, which can amplify discomfort through edema. Other options aren’t the primary drivers here: histamine is more related to allergic-type reactions and not the main pain mediator in DCS; interleukin-2 is a cytokine involved in immune cell growth with little direct role in acute nociception; and dopamine pathways do not mediate this acute endothelial-pain response.