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The Bends - Decompression Syndromes

The Bends Overview

Scuba diving has achieved remarkable popularity in the years since Jacques-Yves Cousteau and Emile Gagnon developed the demand valve regulator and portable air tank in 1943. The Professional Association of Diving Instructors (PADI) alone has certified over 5 million divers worldwide. Diving also plays a role in numerous occupations in the military, industry, and scientific research.

Breathing gas under pressure can present a myriad of possible medical problems. One of these is decompression sickness or "the bends," caused by breathing nitrogen or other gases under pressure, which are not metabolized by the body.

  • Doctors first described decompression sickness as caisson disease, because workers building bridges in pressurized air boxes called caissons developed symptoms of the then-mysterious illness.
  • In the United States, more than 500 people suffer from decompression sickness each year.



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Decompression Sickness »

Although decompression sickness (DCS), a complex resulting from changed barometric pressure, includes high-altitude–related and aerospace-related events, this article focuses on decompression associated with the sudden decrease in pressures during underwater ascent, usually occurring during free or assisted dives.

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