Which scenario best explains decompression sickness?

Which scenario best explains decompression sickness?

• A. Opening a pressurized bottle rapidly causes nitrogen to come out of solution and form bubbles in tissues
• B. Increasing ambient pressure dissolves more nitrogen causing no issue
• C. Oxygen toxicity is the primary cause
• D. DCS occurs only underwater

Answer: (A)

Decompression sickness happens when inert gas, mainly nitrogen, that is dissolved in body tissues under higher pressure comes out of solution as pressure drops, forming gas bubbles in tissues and blood. In the scenario, opening a pressurized bottle rapidly creates a sudden pressure drop. The nitrogen the body has absorbed at the higher pressure suddenly comes out of solution and forms bubbles, which can disrupt blood flow and cause the symptoms of DCS. This is distinct from oxygen toxicity, which stems from too much oxygen, not nitrogen bubbles. It’s also not limited to underwater environments; any rapid decrease in ambient pressure—whether at depth, in an aircraft cabin, or after a pressurized environment is opened abruptly—can trigger DCS.

Decompression sickness happens when inert gas, mainly nitrogen, that is dissolved in body tissues under higher pressure comes out of solution as pressure drops, forming gas bubbles in tissues and blood. In the scenario, opening a pressurized bottle rapidly creates a sudden pressure drop. The nitrogen the body has absorbed at the higher pressure suddenly comes out of solution and forms bubbles, which can disrupt blood flow and cause the symptoms of DCS.

This is distinct from oxygen toxicity, which stems from too much oxygen, not nitrogen bubbles. It’s also not limited to underwater environments; any rapid decrease in ambient pressure—whether at depth, in an aircraft cabin, or after a pressurized environment is opened abruptly—can trigger DCS.