Nitrogen Narcosis - Mathematical Model?

[DiveNav]

Hi,
I want to add Nitrogen Narcosis effects to our dive simulator but, a part from the Martini's law, I can't find enough info to mathematically model it.

More specifically, in addition of Nitrogen Narcosis being dependent on N2 partial pressure (and fitness level, cold, stress, workload .....), is there any timing associated with the onset/strength of Nitrogen Narcosis? (like in the Oxigen Toxicity case)?

thanks

Alberto

 

[Cave Diver]

Seems as if CO2 retention plays a part in narcosis onset and strength.

 

[walke121]

I don't really know how you could model that. You could model the amount of nitrogen in the blood but that wouldn't tell you the effect of the narcosis on the individual. Its just like beer, one person drinks 4 and is trashed and another person drinks 24 and appears sober.

 

[DiveNav]

I don't really know how you could model that. You could model the amount of nitrogen in the blood but that wouldn't tell you the effect of the narcosis on the individual. Its just like beer, one person drinks 4 and is trashed and another person drinks 24 and appears sober.

We are already modeling the amount of Nitrogen in the blood ... but is it the "amount of Nitrogen" or the "partial pressure" of the Nitrogen that really counts here?

We also have mathematical models for: human body, core temperature, effort level/oxygen consumption and heart rate

But I need more info ....

As an example, is there any paper available that show correlations between body type/size vs. alcohol tolerance ....

thanks

Alberto

 

[Gombessa]

Hi,
I want to add Nitrogen Narcosis effects to our dive simulator

I wish I could help you with the modeling question, but what I'm really wondering if you're really going to have a line of pink elephants wearing tutus dance across the screen when you descend below 100ft

 

[mikemill]

Don't forget that Oxygen has a narcotic effect.

 

[DiveNav]

..... but what I'm really wondering if you're really going to have a line of pink elephants wearing tutus dance across the screen when you descend below 100ft

What?

Do YOU see dancing pink elephants when YOU get narced?

When I get drunk ... actually the few times I got drunk when I was younger, I was laughing a lot, but I don't recall any pink elephant

AM

 

[DiveNav]

Don't forget that Oxygen has a narcotic effect.

We are already modeling Oxygen Toxicity (both CNS and OTU)

Alberto

 

[Jim Lapenta]

Narcosis effects are one of those things that perhaps you may not be able to model. You could have 50 divers at the same depth for the same time. The effects for each could be markedly different. All the way from goofy to near panic to perceptual narrowing( my usual symptom) to seemingly no effect at all. Also narcosis has an effect on the body's thermoregulating ability. That one is not talked about much but can be a very real issue on longer deeper dives in moderate to cold water.

 

[mikemill]

We are already modeling Oxygen Toxicity (both CNS and OTU)

Alberto

That's great but if you aren't taking into account all the gases that produce a narcotic effect then your model for narcosis is worthless.