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Scuba Forum / General / August 2006Decompression Sickness
Decompression sickness is a condition resulting from inadequate release of excess nitrogen absorbed during a dive. Decompression sickness is not the same as decompression illness. Decompression illness is a term which describes both overexpansion injuries, including arterial gas embolism (AGE), and decompression sickness (DCS) for purposes of treatment. (SSI Open Water Diver Manual, Third Edition, December 1995.) Technical Diving International (TDI) defines decompression sickness as a series of maladies associated with nitrogen or other gas coming out of solution of the blood or tissues, sometimes as bubbles. This may cause just simple pain or be associated with severe neurological effects. (©J. Odom and International Training 2000 Rev 1b.) The TDI definition is more expansive to encompass other gasses that may be used in technical diving. What is risk? Risk is a concept related to human expectations. It denotes a potential negative impact, in the case of SCUBA, to your health that may arise from gas coming out of solution too quickly. Scuba involves inhaling compressed air. The act of breathing compressed air under water leads to gas coming out of solution once the pressure of the water is reduced or eliminated. The risk of DCS or decompression illness exists until your body has again gained gas equilibrium in air. Decompression symptoms usually occur within 8 hours but can occur even after 24 hours. Decompression symptoms rarely occur during a dive. There are many diving factors or conditions that contribute to DCS including, just to name a few, ascent rate too rapid, heavy work load, cold, and dehydration. There are post dive activities that contribute to DCS including flying and strenuous exercise, just to name two. What can you do to minimize the risk associated with decompression illness? For starters, follow your scuba training, hydrate before and after diving, control your ascent, monitor your limits, decrease your work load, keep warm, don't fly for 24 hours after your last dive, and avoid strenuous exercise. You can in fact reduce the risk of DCS. Every scuba course you've ever taken, more than likely, has been about doing just that. > Decompression sickness is a condition resulting from inadequate release of > excess nitrogen absorbed during a dive. Decompression sickness is not the [quoted text clipped - 31 lines] > exercise. You can in fact reduce the risk of DCS. Every scuba course > you've ever taken, more than likely, has been about doing just that. Other than staying out of the water, you CAN NOT reduce yer DCS risk below about 0.0004, depending who's doing the stats and what they consider a valid hit. If you "follow your scuba training, hydrate before and after diving, control your ascent, monitor your limits, decrease your work load, keep warm, don't fly for 24 hours after your last dive, and avoid strenuous exercise" yer risk is about 0.0004. Nothing you do can reduce that risk. Nothing. > If you "follow your scuba training, hydrate before and after diving, > control your ascent, monitor your limits, decrease your work load, keep > warm, don't fly for 24 hours after your last dive, and avoid strenuous > exercise" yer risk is about 0.0004. Nothing you do can reduce that risk. > Nothing. Would you agree that if you're not as well-hydrated as you should be from all the drinking the night before, if you do a faster ascent than you should because you're in a hurry, do moderate work underwater (prying scallops, say), in cold water on a cold night, and have to strenuously hike your gear up a steep hill after the dive, that your risk might be greater than 0.0004? If so, wouldn't using nitrox on air tables tend to counterbalance the increased risk from the other factors? If not, then why worry about any "risk" factors? >>If you "follow your scuba training, hydrate before and after diving, >>control your ascent, monitor your limits, decrease your work load, keep [quoted text clipped - 7 lines] > say), in cold water on a cold night, and have to strenuously hike your gear > up a steep hill after the dive, that your risk might be greater than 0.0004? Not within modern recreational tables, no. > If so, wouldn't using nitrox on air tables tend to counterbalance the > increased risk from the other factors? Using nitrox on air tables could very well increase yer risk. > If not, then why worry about any "risk" factors? I'm a geriatric insulin dependent diabetic in rather poor shape. I stay within the tables for the gas I'm diving and don't worry about anything. >Using nitrox on air tables could very well increase yer risk. How? > >Using nitrox on air tables could very well increase yer risk. > > How? When other divers see what you are doing, they will refuse to buddy up with you. Solo divers have greater risk than buddied divers. Dive Brooklyn, birthplace of scuba > When other divers see what you are doing, they will refuse to buddy up > with you. Solo divers have greater risk than buddied divers. That is debatable... Come to think of it, I suspect that we *have* debated it before... Go read the Google Groups archives of those topics and we can start the discussion from where it left off... Of course, it probably morphed into a sex, guns, or politics thread, so we might as well start from there... As such, what caliber weapon should one use upon carpetbagging politicians whose husbands are known for not being able to keep it zipped? > > When other divers see what you are doing, they will refuse to buddy up > > with you. Solo divers have greater risk than buddied divers. [quoted text clipped - 8 lines] > politicians whose husbands are known for not being able to keep it > zipped? Ballots, not bullets are the best course in this case. ;-) Dennis On Mon, 7 Aug 2006 22:57:29 -0500, "Dennis \(Icarus\)" <nojunkmail@ever.invalid> wrote: > Ballots, not bullets are the best course in this case. > ;-) But that won't allow it to morph into our sex-guns-and-politics thread... >On Mon, 7 Aug 2006 22:57:29 -0500, "Dennis \(Icarus\)" ><nojunkmail@ever.invalid> wrote: [quoted text clipped - 3 lines] >But that won't allow it to morph into our sex-guns-and-politics >thread... Well for a unzipped pollie case, choose the smallest calibre that lets the shriveled weiner fit inside the barrel :P if he's gonna have one last f.ck, why not make it memorable :P > On Mon, 7 Aug 2006 22:57:29 -0500, "Dennis \(Icarus\)" > <nojunkmail@ever.invalid> wrote: [quoted text clipped - 3 lines] > But that won't allow it to morph into our sex-guns-and-politics > thread... I had sex with a girl once while we were both smoking Nitrox, but then I had to shoot her...with a .38 auto....she was a damn republican. > I had sex with a girl once while we were both smoking Nitrox, but then I had > to shoot her...with a .38 auto....she was a damn republican. Oh yeah, you're one of those Yankees from NORTH Carolina... I can understand how that could confuse you a bit... <grin> >> I had sex with a girl once while we were both smoking Nitrox, but then I >> had >> to shoot her...with a .38 auto....she was a damn republican. > > Oh yeah, you're one of those Yankees from NORTH Carolina... I can > understand how that could confuse you a bit... <grin> Never call me a yankee - i'll answer to dumbass, shithead, fuckwad - but calling me a yankee is an insult to me, my mother, and all of my maternal ancestors who have been in the great state of North by-god Carolina since the early 1700's. (my dad's folks are from Switzerland, but he was born in NC as was I). <grinning back atcha> > Never call me a yankee - i'll answer to dumbass, shithead, fuckwad - but > calling me a yankee is an insult to me, my mother, and all of my maternal > ancestors who have been in the great state of North by-god Carolina since > the early 1700's. (my dad's folks are from Switzerland, but he was born > in NC as was I). <grinning back atcha> It's still "North" Carolina. Where is that exactly, just north of the Canadian border? >> Never call me a yankee - i'll answer to dumbass, shithead, fuckwad - but >> calling me a yankee is an insult to me, my mother, and all of my maternal [quoted text clipped - 5 lines] > > Where is that exactly, just north of the Canadian border? I ain't saying...we got enough Floridiots moving in here as it is. > I ain't saying...we got enough Floridiots moving in here as it is. Nawh, you just got Yankees who couldn't find Florida when they wanted to retire... >> I ain't saying...we got enough Floridiots moving in here as it is. > > Nawh, you just got Yankees who couldn't find Florida when they wanted > to retire... them too. just don't get me started on the hordes of wetbacks descending upon our state. > them too. just don't get me started on the hordes of wetbacks descending > upon our state. Descending? Are you saying that their origins is the Appalachians? > > them too. just don't get me started on the hordes of wetbacks descending > > upon our state. > > Descending? I thought he was saying they were all reaching the approximate age of 13. >Are you saying that their origins is the Appalachians? Let's not bring relatives into it. > >> Never call me a yankee - i'll answer to dumbass, shithead, fuckwad - but > >> calling me a yankee is an insult to me, my mother, and all of my maternal [quoted text clipped - 7 lines] > > I ain't saying...we got enough Floridiots moving in here as it is. I don't live there (any more) but I'd agree with that statement. 6 months is all the time it took me to realize that I wasn't interested in living there. Way to much "northern exposure" for my tastes. :-) >> When other divers see what you are doing, they will refuse to buddy up >> with you. Solo divers have greater risk than buddied divers. [quoted text clipped - 8 lines] >politicians whose husbands are known for not being able to keep it >zipped? A .22 short. Anything else is a waste of powder & primer.  Signaturedillon How much power does it take to run a server farm? A googlewatt. > A .22 short. Anything else is a waste of powder & primer. Perhaps, but a .22LR is more economical... As a side note, I was kind of up in your area this weekend... Kaitlyn had wanted to go up to New Braunfels for some tubing, but the flow rate was too low, so we wet up to the Upper Guadalupe and kayaked / towed 2 tubes instead (Grace and Kaitlyn alternating with one tube and a cooler of beer and other drinks in the other tube) with me paddling the whole way... Better than the Lower Guadalupe, but there were still a couple of spots where it was shallow enough that I had to either pole it along the rocks or get out and drag it past them... Looks like ya'll need some rain up there... >> A .22 short. Anything else is a waste of powder & primer. > [quoted text clipped - 9 lines] >pole it along the rocks or get out and drag it past them... Looks like >ya'll need some rain up there... No sh.t! We got about 1/2 inch in 20 minutes this weekend, but it was localized and that much rain in that little time doesn't do much more than lower the termperature and raise the humidity. Signaturedillon How much power does it take to run a server farm? A googlewatt. > No sh.t! We got about 1/2 inch in 20 minutes this weekend, but it was > localized and that much rain in that little time doesn't do much more > than lower the termperature and raise the humidity. Yeah, I did notice that the humidity seemed a bit less than down here in Houston... Even though it might have been a couple of degrees warmer, it at least *felt* better... The water in the Upper Guadalupe was exactly *cool*, but it felt refreshing enough... Definitely better than the water would this time of the year have been in my previous house that had a pool... >> If you "follow your scuba training, hydrate before and after diving, >> control your ascent, monitor your limits, decrease your work load, keep [quoted text clipped - 13 lines] > > If not, then why worry about any "risk" factors? I don't. Saves a shitload of stress. That was a fantastic restaurant, by the way. :-) >> If not, then why worry about any "risk" factors? > > I don't. I don't either, precisely because I often dive nitrox on air tables. > That was a fantastic restaurant, by the way. :-) Glad you liked it, even though I had picked it partially for the outdoor scenery (marina filled with boats, the Queen Mary, etc.), but you seemed to appreciate the indoor scenery much more. Now that I fully understand your preferences, next time I'll find a Japanese joint where we can eat raw fish off naked chicks. Thanks again for all that food and all the beer I washed it down with. Meeting dweeb was a splendid bonus. We really gotta dive someday. >>> If not, then why worry about any "risk" factors? >> [quoted text clipped - 9 lines] > your preferences, next time I'll find a Japanese joint where we can eat > raw fish off naked chicks. Oh, HELL Yes. (I haven't done that since I was 17) Color me there... > Thanks again for all that food and all the beer I washed it down with. > Meeting dweeb was a splendid bonus. We really gotta dive someday. A good time was had by all... :-) SignaturePopeye I have discovered that all human evil comes from this, man's being unable to sit still in a room. -Pascal www.finalprotectivefire.com ....... Now that I fully understand your > preferences, next time I'll find a Japanese joint where we can eat raw > fish off naked chicks. Holy Shiite! I'd better hear from ya when you organize *that* trip. LD. > ....... Now that I fully understand your >> preferences, next time I'll find a Japanese joint where we can eat raw >> fish off naked chicks. >> > Holy Shiite! I'd better hear from ya when you organize *that* trip. Holy f.ck! Only a lawyer would eat fish off plucked fowl, please remember his meanings differ from the Queen's English. >> ....... Now that I fully understand your >>> preferences, next time I'll find a Japanese joint where we can eat raw [quoted text clipped - 6 lines] > Only a lawyer would eat fish off plucked fowl, please remember his > meanings differ from the Queen's English. I can never figure out that Queen's English. When Dave said Holy Shiite, was he calling me an imam? It's my understanding they substitute naked camels and that's plain nasty. >>> ....... Now that I fully understand your >>>> preferences, next time I'll find a Japanese joint where we can eat raw [quoted text clipped - 8 lines] > > I can never figure out that Queen's English. No worries there, I've never spoken it. When Dave said Holy Shiite, > was he calling me an imam? It's my understanding they substitute naked > camels and that's plain nasty. I knew *you'd* get it. LD. >> ....... Now that I fully understand your >>> preferences, next time I'll find a Japanese joint where we can eat raw [quoted text clipped - 6 lines] > Only a lawyer would eat fish off plucked fowl, please remember his > meanings differ from the Queen's English. I don't care if I only spoke Urdu, I still wouldn't have read it like that. ;) LD. |
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