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Been there , seen it, had to deal with it. I am corret to the T. Believe
it or not.



Michael J. Black wrote:
> 
> Einar,
> 
> I bounced your question off Ernest Campbell M.D. at Diving Medicine
> Online.  Question:  "A dive instructor with asthma asks about the risk
> of 100% O2 for deco at 20-ft stop.  Also wonders about allowable
> UPTD's (units of pulmonary toxic dose) given his stable asthma."
> 
> Dr. Campbell's answer:  "I'm not aware of any studies relating asthma
> and O2 pulmonary toxicity.  A reduction in vital capacity would be the
> main thing your dive instructor would notice over a period of repet
> dives with 100% O2 deco at 20 feet.  The other factor might be
> bronchospasm from the O2, noticed immediately.  Lambertsen's UPTD's
> are calculated by formula using time, pressure and a constant of
> 0.5 as a threshold in bars, and asthma would have nothing to do with
> changing or increasing the risk further.  His daily exposure limits
> would not be any different with or without asthma."
> 
> Hope that helps a little.  Asthma is a relative contraindication to
> diving and you know undoubtedly that you are walking a fine line.
> It has been the subject of a great deal of debate over the years, and
> was once considered an absolute contraindication to diving.  Because
> there are several different types of asthma and because it can be well
> controlled with meds, the standards have been relaxed somewhat in
> recent years.  Take it easy and good luck.
> 
> MJB
> 
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