During ascent, which condition can occur from ascending too rapidly or holding the breath?

During ascent, which condition can occur from ascending too rapidly or holding the breath?

• A. Barotrauma
• B. Nitrogen narcosis
• C. Air embolism
• D. Decompression sickness

Answer: (C)

When a diver ascends, the surrounding pressure drops and air in the lungs tends to expand. If you hold your breath, that expanding air has nowhere to go, so the alveoli can rupture. This allows air to leak into the pulmonary veins and travel through the bloodstream, creating an air embolism. These air bubbles can block blood flow to the heart, brain, or other organs, producing symptoms ranging from chest pain and difficulty breathing to neurologic changes. This mechanism specifically links rapid ascent and breath-holding to the entry of air into the circulation, which is why air embolism is the best choice. Barotrauma is a broad term for pressure-related injuries, decompression sickness results from nitrogen bubbles forming in tissues during ascent, and nitrogen narcosis is a gas effect at depth; none align as directly with the combination of rapid ascent and breath-holding the way pulmonary overexpansion and air entering the bloodstream do.

When a diver ascends, the surrounding pressure drops and air in the lungs tends to expand. If you hold your breath, that expanding air has nowhere to go, so the alveoli can rupture. This allows air to leak into the pulmonary veins and travel through the bloodstream, creating an air embolism. These air bubbles can block blood flow to the heart, brain, or other organs, producing symptoms ranging from chest pain and difficulty breathing to neurologic changes.

This mechanism specifically links rapid ascent and breath-holding to the entry of air into the circulation, which is why air embolism is the best choice. Barotrauma is a broad term for pressure-related injuries, decompression sickness results from nitrogen bubbles forming in tissues during ascent, and nitrogen narcosis is a gas effect at depth; none align as directly with the combination of rapid ascent and breath-holding the way pulmonary overexpansion and air entering the bloodstream do.