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Nitrox, Skin Bends and Cozumel

Discussion in 'Ask Dr. Decompression' started by ljwillia, Feb 11, 2019.

  1. michael-fisch

    michael-fisch ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 2,500 - 4,999
    Location: Finally Lake City FL
    What ever happened to surface decompression? I continue to breathe the O2 that I started breathing at 20' for about 10-15 minutes on the surface. Also learned that the maximum amount of bubbles found on doppler usually shows up 30-45 minutes after your ascent.
    A good idea would be to get back on the boat, sitdown and drink as close to a quart of any uncarbonated non caffeine drink quickly while doing no exercise. Drinks containing alcohol, although widening your veins, also drop your blood pressure so are not a good idea.
    The very worst thing you can do to yourself is haul your gear from the boat back to the diveshop within 90 minutes of surfacing while your body is working like a shook up Pepsi can. If you don't get skin bends doing that, remember it wasn't your fault that you didn't get a hit.
    Multiple dives, closely spaced over many days, also results in a disproportionate number of hits, in my case it took weeks to relearn how to walk after 8 decodives involving at least 30 minutes of O2 deco each within a time frame of 76 hrs, followed by helicopter flight - 4hrs intensive care, another helicopter flight followed by a TT6 with 3hrs of O2 extensions, and 2 TT5s.
    Learned that trying to convince ER and Intensive Care Physicians that the only treatment for what I've got is a hyperbaric chamber is very difficult unless one of your buddies is armed and demonstrating a willingness to use it.

    JamesBon92007 likes this.
  2. ljwillia

    ljwillia Barracuda

    # of Dives: 100 - 199
    Location: Richmond, Va.
    I have not heard of a silent safety stop. I did a google search but didn't find anything. Can you explain?

    I think when the thread was moved it broke my notifications. I just realized there are a lot of responses to this.

    What caused my hit? I've thought about this quite often. I don't think it was entirely "undeserved". Tired from airline travel and a very early morning. Probably did not hydrate well. Most importantly, I dove close to limits. I didn't think so at the time, but reviewing my computer I was complacent. Another factor that I will never repeat was deference to my dive master. We were doing 2 dives/day close to the same depth. I knew I should have objected but made the all to common assumption "He knows better than me. He's been doing this longer".

    I also thought my computer (purchased my first year of diving) was conservative. Turns out, not so much. Unfortunately I can't change the algorithm but I can dive more conservatively.

    Thanks to everyone on this thread. It has been a real education!
  3. DandyDon

    DandyDon Old men ought to be explorers ScubaBoard Supporter

    # of Dives: 200 - 499
    Location: One kilometer high on the Texas Central Plains
    Effortlessly floating for a minute or more after surfacing as your body hits its peak in offgassing.
    Jay and ljwillia like this.
  4. JamesBon92007

    JamesBon92007 Great White

    # of Dives: 2,500 - 4,999
    Location: Southern California...too far from the ocean
    Recently on a trip to Cozumel the DM said "anyone not diving with a computer just stay with me." That might work quite well if everything and everyone was equal. At one point I noticed, toward the end of the dive, that he was about 10 feet shallower than the rest of the group because he was leading and the bottom was sloping upward. I think the right answer is to watch out for yourself.
  5. Jay

    Jay Need to dive more!

    # of Dives: 100 - 199
    Location: Melbourne, OZ.
  6. leadduck

    leadduck Barracuda


    Did your physician bring up the topic of a PFO? Severe undeserved type II DCS after an uneventful benign NDL dive could also be related to a PFO combined with exertion, coughing, sneezing, Valsalva maneuver, ...
  7. krbailey

    krbailey ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 100 - 199
    Location: Pittsburgh, PA
    I brought the topic up with the doctors at the hyperbaric chamber. They didn't think it was likely. Subsequently, I went to my primary care physician back in the States who scheduled a test (echocardiogram, I think?). No indications of PFO.

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