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Old 6th May 2009, 08:57   #1 (permalink)
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Minor incident with OTU?

Hi,
Not sure if this is the right place for the topic but...
I am writing this behalf of my friend (really)
And we hope to get some good ideas & feedback.

The dive was made to 98meters.
Sp.1.3
diluent with 60% of He
water temp "3-6 celscius"

First level was 44m, where he spent around ten minutes, then descending to 98 meters, where he spent 16minutes. Ascent was done based on shearwater computer with gradients 15/95
Also in the way back there was about 10 minutes extra at 44m
I dont know the exact deco schedule, but he said that he did airbreaks before 85% cns reached... Overall dive length was bit over 180 minutes.
Everything went well so far, but after about 10 minutes after the dive he was coughing, had diffculty to breath, had been feeling very very weak. He had tried to breath oxygen, but it made him feel a lot worse. This happened in tuesday, dive before this was done friday, with sp. 1.3 for 120 minutes.

So, the symptoms are very likely that he had OTU "overdose", even though the limits were not close, for a singe dive day?
He did wen to hospital, after the dive, no other symtoms, like DCS was found. Hospital people are not really on the track with diving here in finland, and nothing special considering general health has not been proven.

Anything else than OTU hit? Yes, I did suggest to lower the sp in the future...
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Old 6th May 2009, 09:38   #2 (permalink)
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Re: Minor incident with OTU?

My gut thinks you hit the nail on the head. Lowering the setpt to 1.0 does not really add much additional deco time.

One other thought is that he might have inhaled some sodalime dust particles. I remember getting some of the same symptoms on some dives when I used a dustier brand of sodalime.

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Old 6th May 2009, 10:33   #3 (permalink)
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Re: Minor incident with OTU?

I would doubt very much this is pulmonary Oxtox considering you have around 1600 units on day one and most agencies allow around 300 UPTD and your schedule is a long way from that.
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Old 6th May 2009, 11:18   #4 (permalink)
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Re: Minor incident with OTU?

Quote: (Originally Posted by tecdivertraining) View Original Post
I would doubt very much this is pulmonary Oxtox considering you have around 1600 units on day one and most agencies allow around 300 UPTD and your schedule is a long way from that.
That was at first definitely my opinion too. But the symptoms at the siurface are just like pulmonary O2tox are. And even that reaction after he took O2 on surface.


Quote: (Originally Posted by [B)
jkaterenchuk[/b]]
One other thought is that he might have inhaled some sodalime dust particles. I remember getting some of the same symptoms on some dives when I used a dustier brand of sodalime.
We are using moleculars 797, that aint very dusty, but this sounds interesting. Are there any other effects if lime was inhaled?
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Old 6th May 2009, 11:19   #5 (permalink)
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Re: Minor incident with OTU?

I've had similar symptoms when diving in cold water (<6deg) though mine developed on the surface, within about ten minutes of surfacing. Coughing, sounding a bit like a chest infection, wheezing, lot of congestion forming very quickly (none before the dive and no cold/flu symptoms). I also felt weak, like I couldn't get my breath, especially going up stairs and stuff like that. Lasted about 24hrs and then vanished. It definitely wasn't a cold or infection or anything like that as it came and went too quick, I thought it was maybe very cold moisture hitting the back of my throat and lungs.

I've had pulmonary toxicity symptoms, from a chamber treatment and from a long deco on too high a PO2, and it was nothing like those. With the pulmonary tox I noticed a very sore/irritated throat, like when you know you've got a cold coming and it lasted for a day or two after the exposures.

Cheers,

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Old 6th May 2009, 11:31   #6 (permalink)
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Re: Minor incident with OTU?

maybe its related to vasoconstriction of the blood vessels from the O2 and cold conditions once back at the surface.


on a slightly different twist:

I have had similar symptoms with a guy who swallower some loop juice on the ascent. when back at the surface the diver didnt put 2+2 and had quite a bit of discomfort for around 1 hrs maybe a little liquid on the lungs caused the problem.
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Old 6th May 2009, 11:37   #7 (permalink)
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Re: Minor incident with OTU?

Quote: (Originally Posted by jkaterenchuk) View Original Post
My gut thinks you hit the nail on the head. Lowering the setpt to 1.0 does not really add much additional deco time.
I have to agree. When doing really long project dives at similar depths we eliminated that issue by dropping the set point to 1.0 or less and keeping it there till 40 feet.

Even when using 1.0 at depth, if we raised it too early on deco toasting your lungs was a common problem even though we were well within safe limits.

FWIW, for this and a multitude of other reasons, I keep the setpoint at depth in the 1.0 and lower range and raise it slowly and sparingly for deco.
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Old 6th May 2009, 12:15   #8 (permalink)
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Re: Minor incident with OTU?

Quote: (Originally Posted by antti) View Original Post
We are using moleculars 797, that aint very dusty, but this sounds interesting. Are there any other effects if lime was inhaled?
I am currently using 797 and do not experience the issues. In fact that is how I came to the conclussion. I was using another brand and would find fine particles of dust in the BOV and loop hoses. Not alot but enough that I had to do extra work when cleaning. Once I switched to the 797 the fine dust and symptoms have gone away.

I remember reading something about the concerns with inhaled sodalime but can not remember where. You might do a search here on RBW or the Rubicon documents.

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Old 6th May 2009, 14:35   #9 (permalink)
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Re: Minor incident with OTU?

When we were doing long dives on high PO2's in Antarctica that was real common problem. The dive surgeon kept a tent that was heated and moisturized that we had to hang out in for a while before going outside for any length of time. Your tissues get irritated and swollen from O2 and then when you hit them with dry cold air it can get extremely aggravated. The surgeon told us about one diver who they had to trak when his throat swelled shut, that kept us in the tent with little complaint. Running a lower PO2 helps to alleviate some of this as your O2 exposure will be lessened, thus the tissue aggravation will be less. I have used a filter masks to help with this also when I have been ice diving in extreme cold temperatures. The mask will help to keep the air you breath warmer and moist. Especially if you are doing multiple dives.
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Old 6th May 2009, 16:00   #10 (permalink)
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Re: Minor incident with OTU?

Sounds more like Pulmonary DCS/Chokes to me.
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