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From: HeimannJ on Tue, Aug 2, 1994 2:40 PM
Subject: RE: Gas with Air Repet
To: Dan Nafe; techdiver

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Dan Nafe wrote (in response to my note):

>> this.   The real issue is that they don't account for the fact that
existing
>> He bubbles from the previous dive may make the Haldanean model too
>> inaccurate. Then again, I don't believe that custom table programs take
this
>> into account either, except insofar as they may use different J factors
than
>
>MiGPlan does take absorbed He and N2 from previous dives and calculates 
>inert gas loading and decompression obligation for multi-leve/repetitive 
...
>MiGPlan does not account for Helium bubbles (!) that the poster was 
>talking about. (I'm sure he meant absorbed/dissolved/saturated Helium.)

No, I meant bubbles. A certain degree of bubbling is likely after a dive,
even though neo-Haldanean models like Buhlmann, which is what I assume MiG
plan uses, don't explicitly take them into account.  My understanding is that
most implementations assume that He and N2 ongassing and offgassing are
independent and governed by Henry's law.  Among the ways in which this
assumption can fail is if He bubbles from a previous dive affect circulation,
especially in the alveoli.  They could then significantly affect N2
offgassing.

I admit here that I studied physics and not physiology - but I don't sell
decompression software.

John

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