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HPNS might not be relevant to most trimix divers.  However, it is a result of 
using helium breathing mixtures.  The trimix training presumably discusses 
the benefits, risks, and procedures for using mixes including helium, such as 
trimix. In my opinion, a mention of HPNS in the course is appropriate.

This is similar to mentioning oxygen toxicity in an open water diver course 
which is teaching only air to less than 130'.  However unlikely when diving 
under conditions similar to training, the condition described is a result of 
breathing the gas in question at depth.  Thus the diver using it should be 
aware of this effect.  For the oxygen toxicity example, this topic might be 5 
minutes of the entry level scuba course, and significantly more in the nitrox 
course.

My opinion is that it doesn't hurt to know a little more about something than 
you absolutely need to know at the moment.  The trick is in presenting that 
knowledge so that it adds to the overall understanding without opening doors 
to misusing it.

JS
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