Oxygen toxicity studies

[wedivebc]

Have any studies been performed to validate or refute the limits of our common NOAA oxygen CNS toxicity chart? I hear of lots of people going way past the limits defined in the chart but there seems to be very little consesus on how accurate or reliable those limits are.

 

[Johnoly]

Have any studies been performed

Lately, Duke has been doing topside skin tests that give advance notice of OxTox before it happens. But under water testing of OxTox limits is generally frowned upon.

 

[wedivebc]

Lately, Duke has been doing topside skin tests that give advance notice of OxTox before it happens. But under water testing of OxTox limits is generally frowned upon.

You would think U/W tests using FFM should be pretty safe.

 

[Celt]

Have any studies been performed to validate or refute the limits of our common NOAA oxygen CNS toxicity chart? I hear of lots of people going way past the limits defined in the chart but there seems to be very little consesus on how accurate or reliable those limits are.

You could test yourself for early signs of toxicity. We did chamber tests for commercial work. Surface oxygen deco in a chamber.

Oxygen

www.aqua-med.eu

 

[MB NZ]

You would think U/W tests using FFM should be pretty safe.

No. A person having a seizure may require some basic airway management at the very least.

 

[Capt Jim Wyatt]

You would think U/W tests using FFM should be pretty safe.

I agree. However, someone has to fund these studies. I have "HEARD" from "THEM" that the NOAA tables are not accurate. I am not sure who "THEM" are.

 

[gbirch]

The book Chamber Divers is an interesting read on the early studies on this subject. Two things that I learned from that book:
1. It is HIGHLY variable
2. Results in a dry chamber don’t correlate to results while submerged.
3. (OK, I said 2 but here is a third) OxTox convulsions can be very violent: One researcher that suffered a hit experienced such violent contractions of the muscles in the back that it crushed a vertebrae that affected them for the rest of their lives

I’ll wait patiently for any more solid research before even considering exceeding current limits - but that’s just me being cautious and I like my spine the way that it is

 

[PfcAJ]

I agree. However, someone has to fund these studies. I have "HEARD" from "THEM" that the NOAA tables are not accurate. I am not sure who "THEM" are.

Hi, is me, Them.

 

[Capt Jim Wyatt]

Hi, is me, Them.

Huh?

 

[PfcAJ]

Huh?

I am the “them” you are referencing. I do not think the NOAA tables reflect reality.

“100%” doesn’t mean anything as if been shown for decades now that people can repeatedly expose themselves to 10-30x (or more) of the “maximum” and not suffer ill effects. This calls into serious question the validity of the NOAA oxygen toxicity guidelines.