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I recently had my first scuba dive. And the other instructor here was referring to something that is related to air Embolism as I overheard, that one should not surface too rapidly after a deep dive. I could only hear it that it could prove fatal as well.
I know what is Embolism, but i have no wisdom about how the embolism would be introduced when a diver gets to the surface rapidly. Please shed some light here..

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All the details: en.wikipedia.org/wiki/Decompression_sickness –  Michael Borgwardt Jan 30 at 14:04
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An embolism in a medical context refers to any large moving mass or defect in the blood stream. An air embolism is an air bubble trapped in a blood vessel. When an air bubble travels along an artery, it moves through a system of blood vessels that gradually become narrower. At some point, the embolus will block a small artery and cut off the blood supply to a particular area of the body.

For example, when a person scuba dives with compressed air, they take in extra oxygen and nitrogen. The body uses the oxygen, but the nitrogen is dissolved into the blood, where it remains during the dive. As one swims back toward the surface after a deep dive, the water pressure around decreases. If this transition occurs too quickly, the nitrogen does not have time to clear from the blood. Instead, it separates out of the blood and forms bubbles within tissues or blood. It is these nitrogen bubbles that cause decompression sickness.

For venous air embolisms, death may occur if a large bubble of gas becomes lodged in the heart, stopping blood from flowing from the right ventricle to the lungs. However, experiments in animals show that the amount of gas necessary for this to happen is quite variable, and also depends on several other factors, such as body position.

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