Quote: (Originally Posted by
jhaaja)
Here comes a clarification about the calibration that I did before the dive. I use 99,5% pure oxygen and when I calibrated I input to the handset that O2 percentage is 98%. Hope this clears this issue.
Thanks for the palpations explanation. Now I am even more sure that it was diaphgram contractions, because I can remember those quick inhale spikes during the contraction.
That's the right way to calibrate Inpiration reb, as 98% is referred non to the tank's FO2 but the FO2 into the head after flushin' with oxygen.
Apart the little differenc anyway.
It may be interestin to understand more about scopolamine, as I've heard that saturation divers can't use else that a bit aspirine!
Anyway Hyperoxia has very variable limits: when I was younger in '70 years, dove often with oxygen rebreathers deeper than 40' and did have no problems, also if the workload was at lower levels, it was a lot dangerous anyway!
Just once I was workin' in the shallow waters of an harbour did see some flashes, I surfaced "as a rocket" with no conseguences.
Now I'm terrible afraid about I did at that time and we must remenber that the lot of parameters involved to lead into cns convulsion cannot give absolutely safe limits.
Fabio Bartolucci