Which concept describes intravascular bubbles behaving as foreign bodies in DCS?

• A. They have no role.
• B. Intravascular bubbles acting as foreign bodies contribute to DCS.
• C. They are beneficial.
• D. They only occur in Type II DCS.

Answer: (B)

In decompression sickness, gas bubbles that form in blood and tissues act as foreign bodies. These intravascular bubbles physically obstruct small vessels and ignite inflammatory and coagulation responses, leading to tissue ischemia and damage. This combination of mechanical blockage and inflammation explains the range of DCS symptoms from joint and skin issues to neurological and cardiopulmonary signs. The statement that intravascular bubbles acting as foreign bodies contribute to DCS directly reflects this mechanism, which is why it’s the best description. The other options misstate the role: bubbles do have a role, they are not beneficial, and they can be involved in various DCS presentations, not just Type II.