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Thread: O2 convulsion

  1. #41
    Longbottom Time RAL is a glorious beacon of light RAL is a glorious beacon of light RAL is a glorious beacon of light RAL is a glorious beacon of light RAL is a glorious beacon of light RAL is a glorious beacon of light RAL is a glorious beacon of light RAL is a glorious beacon of light RAL is a glorious beacon of light RAL is a glorious beacon of light RAL is a glorious beacon of light RAL's Avatar
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    Re: O2 convulsion

    Quote Originally Posted by Drmike  View Original Post



    I admit when I have a last stop longer than 45mins and Im alone in the water I do worry and actually my practice is to clip myself to the deco platform in case of convulsion (wont sink or ascend then and Im wearing a FFM)

    Only had the twitchies once and it scared the crap out of me.


    Food for thought.
    Mike do you take a 5 min air break every 25 min?

    RAL

  2. #42
    RBW Member Ahmed Adly is an unknown quantity at this point Ahmed Adly's Avatar
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    Re: O2 convulsion

    This come a bit late, but your dive buddy should be awarded a medal!
    He has shown heroism beyond self preservation, which is wonderful.
    Keep safe!

  3. #43
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    Re: O2 convulsion

    thanks GOD that you are okay now.
    it feels scary to hear that someone went down with his rebreather fully checked up & operating well just to have such an accident.
    but do you still trust your inspration ?
    I think, if I were you, I may have quit diving my Dolphin.
    best wishes of enjoyable diving

  4. #44
    RBW Member SteveL is just really nice SteveL is just really nice SteveL is just really nice SteveL is just really nice SteveL is just really nice SteveL is just really nice SteveL is just really nice SteveL is just really nice SteveL is just really nice SteveL is just really nice SteveL's Avatar
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    Re: O2 convulsion

    Quote Originally Posted by Drmike  View Original Post
    I was on a trip last year and we had a diver do a slow ascent from 72m (after spending about 15-20 mins working down there, he spent no more than 30 secs on the surface shouting instructions to the crew then turned straight around and descended back to depth and did all his deco. He didnt get any DCI.


    Was your dive a hard one?
    Wasnt it one tug for up on the winch and two tugs for down ...... or was it the other way round .......crew....

    Steve

  5. #45
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    Re: O2 convulsion

    Quote Originally Posted by SteveL  View Original Post
    Wasnt it one tug for up on the winch and two tugs for down ...... or was it the other way round .......crew....

    Steve

    he he :D

    That would be the time :D

    But hey it could have been worth it :D
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  6. #46
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    Re: O2 convulsion

    What an incredible story, and dive buddy!
    I am NOT a medical expert (at all!), but I'm inclined to suspect elevated CO2 as well.
    I used to freedive competitively, and one of the things you commonly experience during a long breath-hold is diaphragm convulsions, especially at depth. This is one of the body's early responses to increasing blood-CO2 levels - it's saying "take a breath, stupid - I'm running low on oxygen".

    In addition, we all have different responses to the drop in partial pressures as we ascend - freedivers are at risk of a shallow-water blackout after a deep dive. Their system has enough oxygen at depth, but that last 10m is a whopper of a pressure change...

    Is it possible that his body's CO2 level was elevated, explaining why his systems were reading normal O2 levels in the loop?



    Quote Originally Posted by jhaaja  View Original Post
    The lime was fresh for the dive and RT at the time of the accident was 75mins. I think it is unlikely that CO2 had anything to do with the seizure.

    JH

  7. #47
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    Re: O2 convulsion

    Glad that You're OK, and fine that you had a good dive buddy with you

    Cheers and all the best
    Ossi

  8. #48
    RBW Member Rubis is an unknown quantity at this point Rubis's Avatar
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    Re: O2 convulsion

    Jhaaja thank you for the original post.

    Somebody mentioned in another thread on another board the relationship between Ox Toxicity and Cold.

    We have also the suspicion on certain medications.

    CO2 presence.

    High Workload on high ppO2.

    What else ?

    Question to the experts in physiology, is there a link between metabolic rate and O2 sensitivity ? The questions pops in mind by having seen pictures of some people that had Ox Tox under relatively low ppO2, one thing that stroke me was that they were relatively skinny, probably with high metabolic rates.

  9. #49
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    Re: O2 convulsion

    Folks, jaajah's mishap happened 3 years ago!
    It did found a good comment and attention in J.V.'s book which came out last year ;)

  10. #50
    RBW Member Rubis is an unknown quantity at this point Rubis's Avatar
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    Re: O2 convulsion

    Quote Originally Posted by teddy2005  View Original Post
    Folks, jaajah's mishap happened 3 years ago!
    It did found a good comment and attention in J.V.'s book which came out last year ;)
    So ? It's a good topic especially in the light of récent évents

    Not everybody reads french you know

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