A dysbarism injury refers to signs and symptoms related to changes in what?

• A. Barometric pressure
• B. Ambient temperature
• C. Humidity
• D. Altitude

Answer: (A)

Dysbarism injuries occur because of changes in the surrounding air pressure, known as barometric pressure. When pressure changes—such as during diving and ascent, or rapid changes in altitude—the gases dissolved in our tissues and blood (mainly nitrogen) can come out of solution and form bubbles. Those bubbles can disrupt tissues and vessels, leading to symptoms in the joints, skin, lungs, or nervous system. Barotrauma is also part of this, where pressure shifts damage air-filled spaces like the ears, sinuses, or lungs. Temperature, humidity, or altitude alone don’t directly cause dysbarism; altitude is just a context that involves lower pressure, but the key driver is the change in barometric pressure itself.