Evolved gas dysbarism occurs when...

Evolved gas dysbarism occurs when...

• A. Ambient pressure increases
• B. Pressure remains constant
• C. Air replaces water in tissues
• D. Gases dissolved in body fluids come out of solution as pressure drops

Answer: (D)

When pressure drops, dissolved inert gas (primarily nitrogen from the air we breathe) comes out of solution and forms bubbles in tissues and blood. This release of gas as pressure falls is what evolves gas dysbarism is all about, and it leads to decompression sickness. As you ascend and ambient pressure decreases, the solubility of nitrogen decreases, so gas bubbles form, causing mechanical obstruction, inflammation, and a range of symptoms from joint pain to neurological or pulmonary issues. The other ideas don’t fit: increasing pressure keeps gases dissolved, constant pressure won’t cause outgassing, and air replacing water in tissues isn’t how decompression-related gas release works.

When pressure drops, dissolved inert gas (primarily nitrogen from the air we breathe) comes out of solution and forms bubbles in tissues and blood. This release of gas as pressure falls is what evolves gas dysbarism is all about, and it leads to decompression sickness. As you ascend and ambient pressure decreases, the solubility of nitrogen decreases, so gas bubbles form, causing mechanical obstruction, inflammation, and a range of symptoms from joint pain to neurological or pulmonary issues. The other ideas don’t fit: increasing pressure keeps gases dissolved, constant pressure won’t cause outgassing, and air replacing water in tissues isn’t how decompression-related gas release works.