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While diving CCR the diver is often exposed to the maximum pO2 for the entire dive. Diving OC the diver is exposed to the maximum pO2 only when they are at the maximum depth of the dive and during the first decompression stop after a gas switch.

While diving CCR the diver is often exposed to an elevated partial pressure of carbon-dioxide (pCO2). There are several reasons all divers are exposed to elevated pCO2 but when diving CCR there are more reasons and the elevation of CO2 can be greater. Failure of the one-way values sometimes occurs (usually not installed correctly) but by far the most common reason is failure of the CO2 absorbent due to a number of problems that are almost always the diver’s fault. Diver’s don’t pack the absorbent correctly, it settles during a long car or boat ride, divers remove and then refill the canister with the same absorbent, channeling can occur, etc. but most commonly divers simply dive too long on one fill to try and save a few dollars.

So let’s return to the practice of elevating the pO2 during decompression. Not only is the brain at the highest risk of convulsing due to the accumulated damage that occurred during the dive, but the pCO2 is most likely to be elevated as the absorbent is partially or mostly used up.

So why does pCO2 matter so much in O2 toxicity? Quite simply, pCO2 controls the blood flow to the brain. As the pCO2 rises, the blood flow to the brain is increased. As the blood flow to the brain is increased, more O2 (and O2 radicals) will be delivered to the brain even if the pO2 remains constant! More O2 radicals results in more damage to the cells. On top of this, if the diver then also increases the pO2 ……. is it any wonder that they convulse?




Fredrik Astlid
Fredrik Astlid 2011-09-13 15:17:58
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Huvudinlägg PO2 kring 1,2-1,3 Fredrik Astlid 2011-09-11 21:02
svara Sv: PO2 kring 1,2-1,3Nils Möllerström2011-09-11 21:25
svara Sv: PO2 kring 1,2-1,3Calle Lundin2011-09-11 21:59
svara Sv: PO2 kring 1,2-1,3Erik Rådström2011-09-12 00:02
svara Sv: Sv: PO2 kring 1,2-1,3Tomas Persson2011-09-12 07:56
svara Sv: PO2 kring 1,2-1,3Jonas Pavletic2011-09-12 10:34
svara Sv: Sv: PO2 kring 1,2-1,3Peter Eriksson2011-09-12 10:57
svara Sv: Sv: Sv: PO2 kring 1,2-1,3Tomas Persson2011-09-12 11:49
svara Sv: Sv: PO2 kring 1,2-1,3Pontus Svanberg2011-09-12 13:31
svara Sv: Sv: PO2 kring 1,2-1,3Fredrik Astlid2011-09-13 14:55
svara Sv: PO2 kring 1,2-1,3Erik Tjäderqvist2011-09-12 17:49
svara Sv: Sv: PO2 kring 1,2-1,3Fredrik Astlid2011-09-13 15:17
svara Sv: PO2 kring 1,2-1,3Johan Carlsson2011-09-12 22:52
svara Sv: Sv: PO2 kring 1,2-1,3Fredrik Astlid2011-09-13 15:26
svara Sv: PO2 kring 1,2-1,3Peter Blomqvist2011-09-13 20:11
svara Sv: Sv: PO2 kring 1,2-1,3Jonas Pavletic2011-09-13 22:17
svara Sv: Sv: Sv: PO2 kring 1,2-1,3Dmitri Gorski2011-09-14 18:06
svara Sv: Sv: Sv: Sv: PO2 kring 1,2-1,3Jonas Pavletic2011-09-15 00:01
svara Sv: Sv: Sv: Sv: Sv: PO2 kring 1,2-1,3Peter Blomqvist2011-09-15 18:43
svara Sv: Sv: Sv: Sv: Sv: Sv: PO2 kring 1,2-1,3Erik Rådström2011-09-15 18:52
svara Sv: Sv: Sv: Sv: Sv: Sv: Sv: PO2 kring 1,2-1,3Peter Blomqvist2011-09-15 18:59
svara Sv: Sv: Sv: Sv: Sv: Sv: Sv: Sv: PO2 kring 1,2-1,3Erik Rådström2011-09-15 19:20
svara Sv: Sv: Sv: Sv: Sv: Sv: Sv: Sv: Sv: PO2 kring 1,2-1,3Peter Blomqvist2011-09-16 17:04
svara Sv: Sv: Sv: Sv: Sv: Sv: Sv: Sv: Sv: Sv: PO2 kring 1,2-1,3Jonas Pavletic2011-09-16 17:53
svara Sv: Sv: Sv: Sv: Sv: Sv: Sv: Sv: Sv: Sv: Sv: PO2 kring 1,2-1,3Peter Blomqvist2011-09-16 18:53
svara Sv: Sv: Sv: Sv: Sv: Sv: Sv: Sv: Sv: Sv: Sv: Sv: PO2 kring 1,2-1,3Jonas Pavletic2011-09-16 19:34
svara Sv: PO2 kring 1,2-1,3Pontus Svanberg2011-09-14 00:34

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