Any reported cases of Ox Tox between 1.4 and 1.6?

[davehicks]

I got bent at least three times last year, doing multiple single tank, nitrox dives and I go up to 1.6 and follow a computer.

I hope that proves I'm "right" on this issue. LOL

Sounds like I'm making a joke, but two of them were skin bends that hurt for a few days and the other was more serious - significant back pain that developed within 5 minutes of surfacing.

I "treated" myself for the back hit by going back down to about 38 feet (where I got instant and complete pain relief) and then spent 20 -25 minutes coming up, all done on the remaining nitrox in my tank- this happened on the first (only) dive of the day.

That is actually kinda funny now that I think about it; not only did a single tank have enough gas to get me bent (after I did a safety stop no less) but I had enough left over in the same tank to do a redneck deco (IWR) treatment. I came up feeling fine and drove in to a beach picnic and then went snorkeling afterwards, however I was using a large steel tank - maybe a 120.

Yeah use a computer.

Maybe see a doctor. You should not be getting bent that often even if you are being less than careful.

 

[justinthedeeps]

It can't be simple ppO2 numbers, 10+ other personal and situational factors strongly affect both DCS and toxicities

Is someone relaxed at 80 metres on air safer than someone jellyfishing on nitrox at 40 metres? Anecdotally some old timers might agree, but where is the data? It doesn't exist

Experienced photography divers in the tropics (e.g. Lembeh, Anilao) go into NDL/deco on single EAN32 AL80s all of the time, even on ScubaPros at '90/90' or whatever, lots of time sitting relatively still in the ~25 metre depth range. I don't think any of them have ever toxed (?)

Rebreather divers do 300% CNS dives quite regularly on 3+ hour dives with minimum ppO2's of 1.3 and extended (2+ hour) phases of 1.4 and 1.6, throw in some token 'air breaks' because otherwise it's boring as hell sitting there so long not toxing

 

[rjack321]

Is someone relaxed at 80 metres on air safer than someone jellyfishing on nitrox at 40 metres? Anecdotally some old timers might agree, but where is the data? It doesn't exist

Actually it does, although not for those exact gases. Deeper is quantitively more risky for any given set of GFs

 

[rsingler]

I got bent at least three times last year, doing multiple single tank, nitrox dives and I go up to 1.6 and follow a computer.

I think the focus on O2 is not relevant. Ox tox is the "other" gas from the bends, of course.
So my question would be: what were your gradient factors? And if you're not using a computer with GF, but rather "Conservative, Normal, High", or I, II, III, then after three hits I'd really recommend a Shearwater.

 

[rob.mwpropane]

@johndiver999 if you're getting bent why not adjust the dive to suit your body? Maybe move slower, more conservative settings? Honest question, not trying to point fingers. Lots of people get bent, but its obviously a sign something isn't right, yeah?