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Steve, DCI preconditions include PFO (which you can be checked for), pulmonary blebs (which develop in obstructive disorders like bronchitis, emphysema, and asthma), and other cardiac or vascular defects that could lead to right-to-left shunting of blood, i.e. venous to arterial shift. Risk factors are numerous, including dehydration, obesity and poor physical condition, pushing the table limits, heavy exercise during or shortly after diving, hypothermia, previous DCI, age, alcohol, etc. Common sense counts for a lot, and even if you don't know all the risk factors, just be careful. If doing extreme diving, or advanced technical diving like many on this list, it probably is a good idea to get checked for PFO (although some will argue that every diver should be checked). As for pulmonary blebs, don't smoke (common sense). Mike Black __________________________________________________ Do You Yahoo!? Talk to your friends online with Yahoo! Messenger. http://im.yahoo.com -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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