DIR Explorers - View Single Post

Lou · September 16th, 2007, 02:23 PM

Quote: (Originally Posted by Kevrumbo)

Dr. Jolie Bookspan , author of Diving Physiology in Plain English, writes from her article Supra:

"Carbon Dioxide retention is now viewed as a contributor to oxygen toxicity and nitrogen narcosis, suspected as a contributor to decompression sickness, and implicated in incidents of underwater confusion and loss of consciousness."

Also regarding deep air resulting in greater CO2 accumulation than helium based mixtures, she describes a U.S. Navy Experimental Diving Unit study performed in 1958, whose results were reconfirmed in 1995:

"Continued work made it clear that while breathing nitrogen-oxygen mixtures at depth, carbon dioxide retention occurred, whereas with helium-oxygen, ventilation was essentially unimpaired and CO2 levels stayed close to normal."

So, in fact, this is an argument against trimix at depth and for heliox then.

September 16th, 2007, 02:23 PM	#21 (permalink)
Lou(Offline) New Member Join Date: May 2006 Location: Bucks Posts: 199	Quote: (Originally Posted by Kevrumbo) Dr. Jolie Bookspan , author of Diving Physiology in Plain English, writes from her article Supra: "Carbon Dioxide retention is now viewed as a contributor to oxygen toxicity and nitrogen narcosis, suspected as a contributor to decompression sickness, and implicated in incidents of underwater confusion and loss of consciousness." Also regarding deep air resulting in greater CO2 accumulation than helium based mixtures, she describes a U.S. Navy Experimental Diving Unit study performed in 1958, whose results were reconfirmed in 1995: "Continued work made it clear that while breathing nitrogen-oxygen mixtures at depth, carbon dioxide retention occurred, whereas with helium-oxygen, ventilation was essentially unimpaired and CO2 levels stayed close to normal." So, in fact, this is an argument against trimix at depth and for heliox then.